Merging upstream version 11.4.5.
Signed-off-by: Daniel Baumann <daniel@debian.org>
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<h2>API Documentation</h2>
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</span><span id="L-75"><a href="#L-75"><span class="linenos">75</span></a> <span class="n">a</span><span class="o">.</span><span class="n">type</span>
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</span><span id="L-76"><a href="#L-76"><span class="linenos">76</span></a> <span class="ow">and</span> <span class="n">a</span><span class="o">.</span><span class="n">type</span><span class="o">.</span><span class="n">this</span> <span class="o">==</span> <span class="n">exp</span><span class="o">.</span><span class="n">DataType</span><span class="o">.</span><span class="n">Type</span><span class="o">.</span><span class="n">DATE</span>
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</span><span id="L-77"><a href="#L-77"><span class="linenos">77</span></a> <span class="ow">and</span> <span class="n">b</span><span class="o">.</span><span class="n">type</span>
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</span><span id="L-78"><a href="#L-78"><span class="linenos">78</span></a> <span class="ow">and</span> <span class="n">b</span><span class="o">.</span><span class="n">type</span><span class="o">.</span><span class="n">this</span> <span class="o">!=</span> <span class="n">exp</span><span class="o">.</span><span class="n">DataType</span><span class="o">.</span><span class="n">Type</span><span class="o">.</span><span class="n">DATE</span>
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</span><span id="L-78"><a href="#L-78"><span class="linenos">78</span></a> <span class="ow">and</span> <span class="n">b</span><span class="o">.</span><span class="n">type</span><span class="o">.</span><span class="n">this</span> <span class="ow">not</span> <span class="ow">in</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">DataType</span><span class="o">.</span><span class="n">Type</span><span class="o">.</span><span class="n">DATE</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">DataType</span><span class="o">.</span><span class="n">Type</span><span class="o">.</span><span class="n">INTERVAL</span><span class="p">)</span>
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</span><span id="L-79"><a href="#L-79"><span class="linenos">79</span></a> <span class="p">):</span>
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</span><span id="L-80"><a href="#L-80"><span class="linenos">80</span></a> <span class="n">_replace_cast</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="s2">"date"</span><span class="p">)</span>
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</span><span id="L-81"><a href="#L-81"><span class="linenos">81</span></a>
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<title>sqlglot.optimizer.eliminate_ctes API documentation</title>
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<h2>API Documentation</h2>
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<a class="function" href="#eliminate_ctes">eliminate_ctes</a>
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<title>sqlglot.optimizer.eliminate_joins API documentation</title>
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<style>/*! * Bootstrap Reboot v5.0.0 (https://getbootstrap.com/) * Copyright 2011-2021 The Bootstrap Authors * Copyright 2011-2021 Twitter, Inc. * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE) * Forked from Normalize.css, licensed MIT (https://github.com/necolas/normalize.css/blob/master/LICENSE.md) */*,::after,::before{box-sizing:border-box}@media (prefers-reduced-motion:no-preference){:root{scroll-behavior:smooth}}body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans","Liberation Sans",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";font-size:1rem;font-weight:400;line-height:1.5;color:#212529;background-color:#fff;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:transparent}hr{margin:1rem 0;color:inherit;background-color:currentColor;border:0;opacity:.25}hr:not([size]){height:1px}h1,h2,h3,h4,h5,h6{margin-top:0;margin-bottom:.5rem;font-weight:500;line-height:1.2}h1{font-size:calc(1.375rem + 1.5vw)}@media (min-width:1200px){h1{font-size:2.5rem}}h2{font-size:calc(1.325rem + .9vw)}@media (min-width:1200px){h2{font-size:2rem}}h3{font-size:calc(1.3rem + .6vw)}@media (min-width:1200px){h3{font-size:1.75rem}}h4{font-size:calc(1.275rem + .3vw)}@media (min-width:1200px){h4{font-size:1.5rem}}h5{font-size:1.25rem}h6{font-size:1rem}p{margin-top:0;margin-bottom:1rem}abbr[data-bs-original-title],abbr[title]{-webkit-text-decoration:underline dotted;text-decoration:underline dotted;cursor:help;-webkit-text-decoration-skip-ink:none;text-decoration-skip-ink:none}address{margin-bottom:1rem;font-style:normal;line-height:inherit}ol,ul{padding-left:2rem}dl,ol,ul{margin-top:0;margin-bottom:1rem}ol ol,ol ul,ul ol,ul ul{margin-bottom:0}dt{font-weight:700}dd{margin-bottom:.5rem;margin-left:0}blockquote{margin:0 0 1rem}b,strong{font-weight:bolder}small{font-size:.875em}mark{padding:.2em;background-color:#fcf8e3}sub,sup{position:relative;font-size:.75em;line-height:0;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}a{color:#0d6efd;text-decoration:underline}a:hover{color:#0a58ca}a:not([href]):not([class]),a:not([href]):not([class]):hover{color:inherit;text-decoration:none}code,kbd,pre,samp{font-family:SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;font-size:1em;direction:ltr;unicode-bidi:bidi-override}pre{display:block;margin-top:0;margin-bottom:1rem;overflow:auto;font-size:.875em}pre code{font-size:inherit;color:inherit;word-break:normal}code{font-size:.875em;color:#d63384;word-wrap:break-word}a>code{color:inherit}kbd{padding:.2rem .4rem;font-size:.875em;color:#fff;background-color:#212529;border-radius:.2rem}kbd kbd{padding:0;font-size:1em;font-weight:700}figure{margin:0 0 1rem}img,svg{vertical-align:middle}table{caption-side:bottom;border-collapse:collapse}caption{padding-top:.5rem;padding-bottom:.5rem;color:#6c757d;text-align:left}th{text-align:inherit;text-align:-webkit-match-parent}tbody,td,tfoot,th,thead,tr{border-color:inherit;border-style:solid;border-width:0}label{display:inline-block}button{border-radius:0}button:focus:not(:focus-visible){outline:0}button,input,optgroup,select,textarea{margin:0;font-family:inherit;font-size:inherit;line-height:inherit}button,select{text-transform:none}[role=button]{cursor:pointer}select{word-wrap:normal}select:disabled{opacity:1}[list]::-webkit-calendar-picker-indicator{display:none}[type=button],[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]:not(:disabled),[type=reset]:not(:disabled),[type=submit]:not(:disabled),button:not(:disabled){cursor:pointer}::-moz-focus-inner{padding:0;border-style:none}textarea{resize:vertical}fieldset{min-width:0;padding:0;margin:0;border:0}legend{float:left;width:100%;padding:0;margin-bottom:.5rem;font-size:calc(1.275rem + .3vw);line-height:inherit}@media (min-width:1200px){legend{font-size:1.5rem}}legend+*{clear:left}::-webkit-datetime-edit-day-field,::-webkit-datetime-edit-fields-wrapper,::-webkit-datetime-edit-hour-field,::-webkit-datetime-edit-minute,::-webkit-datetime-edit-month-field,::-webkit-datetime-edit-text,::-webkit-datetime-edit-year-field{padding:0}::-webkit-inner-spin-button{height:auto}[type=search]{outline-offset:-2px;-webkit-appearance:textfield}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-color-swatch-wrapper{padding:0}::file-selector-button{font:inherit}::-webkit-file-upload-button{font:inherit;-webkit-appearance:button}output{display:inline-block}iframe{border:0}summary{display:list-item;cursor:pointer}progress{vertical-align:baseline}[hidden]{display:none!important}</style>
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||||
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||||
<h2>API Documentation</h2>
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||||
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<a class="function" href="#eliminate_joins">eliminate_joins</a>
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@ -62,187 +62,184 @@
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<div class="pdoc-code codehilite"><pre><span></span><span id="L-1"><a href="#L-1"><span class="linenos"> 1</span></a><span class="kn">from</span> <span class="nn">sqlglot</span> <span class="kn">import</span> <span class="n">expressions</span> <span class="k">as</span> <span class="n">exp</span>
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</span><span id="L-2"><a href="#L-2"><span class="linenos"> 2</span></a><span class="kn">from</span> <span class="nn">sqlglot.optimizer.normalize</span> <span class="kn">import</span> <span class="n">normalized</span>
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</span><span id="L-3"><a href="#L-3"><span class="linenos"> 3</span></a><span class="kn">from</span> <span class="nn">sqlglot.optimizer.scope</span> <span class="kn">import</span> <span class="n">Scope</span><span class="p">,</span> <span class="n">traverse_scope</span>
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</span><span id="L-4"><a href="#L-4"><span class="linenos"> 4</span></a><span class="kn">from</span> <span class="nn">sqlglot.optimizer.simplify</span> <span class="kn">import</span> <span class="n">simplify</span>
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</span><span id="L-4"><a href="#L-4"><span class="linenos"> 4</span></a>
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</span><span id="L-5"><a href="#L-5"><span class="linenos"> 5</span></a>
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</span><span id="L-6"><a href="#L-6"><span class="linenos"> 6</span></a>
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</span><span id="L-7"><a href="#L-7"><span class="linenos"> 7</span></a><span class="k">def</span> <span class="nf">eliminate_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
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</span><span id="L-8"><a href="#L-8"><span class="linenos"> 8</span></a><span class="w"> </span><span class="sd">"""</span>
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</span><span id="L-9"><a href="#L-9"><span class="linenos"> 9</span></a><span class="sd"> Remove unused joins from an expression.</span>
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</span><span id="L-10"><a href="#L-10"><span class="linenos"> 10</span></a>
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</span><span id="L-11"><a href="#L-11"><span class="linenos"> 11</span></a><span class="sd"> This only removes joins when we know that the join condition doesn't produce duplicate rows.</span>
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</span><span id="L-12"><a href="#L-12"><span class="linenos"> 12</span></a>
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</span><span id="L-13"><a href="#L-13"><span class="linenos"> 13</span></a><span class="sd"> Example:</span>
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</span><span id="L-14"><a href="#L-14"><span class="linenos"> 14</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="L-15"><a href="#L-15"><span class="linenos"> 15</span></a><span class="sd"> >>> sql = "SELECT x.a FROM x LEFT JOIN (SELECT DISTINCT y.b FROM y) AS y ON x.b = y.b"</span>
|
||||
</span><span id="L-16"><a href="#L-16"><span class="linenos"> 16</span></a><span class="sd"> >>> expression = sqlglot.parse_one(sql)</span>
|
||||
</span><span id="L-17"><a href="#L-17"><span class="linenos"> 17</span></a><span class="sd"> >>> eliminate_joins(expression).sql()</span>
|
||||
</span><span id="L-18"><a href="#L-18"><span class="linenos"> 18</span></a><span class="sd"> 'SELECT x.a FROM x'</span>
|
||||
</span><span id="L-19"><a href="#L-19"><span class="linenos"> 19</span></a>
|
||||
</span><span id="L-20"><a href="#L-20"><span class="linenos"> 20</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-21"><a href="#L-21"><span class="linenos"> 21</span></a><span class="sd"> expression (sqlglot.Expression): expression to optimize</span>
|
||||
</span><span id="L-22"><a href="#L-22"><span class="linenos"> 22</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="L-23"><a href="#L-23"><span class="linenos"> 23</span></a><span class="sd"> sqlglot.Expression: optimized expression</span>
|
||||
</span><span id="L-24"><a href="#L-24"><span class="linenos"> 24</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-25"><a href="#L-25"><span class="linenos"> 25</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">traverse_scope</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="L-26"><a href="#L-26"><span class="linenos"> 26</span></a> <span class="c1"># If any columns in this scope aren't qualified, it's hard to determine if a join isn't used.</span>
|
||||
</span><span id="L-27"><a href="#L-27"><span class="linenos"> 27</span></a> <span class="c1"># It's probably possible to infer this from the outputs of derived tables.</span>
|
||||
</span><span id="L-28"><a href="#L-28"><span class="linenos"> 28</span></a> <span class="c1"># But for now, let's just skip this rule.</span>
|
||||
</span><span id="L-29"><a href="#L-29"><span class="linenos"> 29</span></a> <span class="k">if</span> <span class="n">scope</span><span class="o">.</span><span class="n">unqualified_columns</span><span class="p">:</span>
|
||||
</span><span id="L-30"><a href="#L-30"><span class="linenos"> 30</span></a> <span class="k">continue</span>
|
||||
</span><span id="L-31"><a href="#L-31"><span class="linenos"> 31</span></a>
|
||||
</span><span id="L-32"><a href="#L-32"><span class="linenos"> 32</span></a> <span class="n">joins</span> <span class="o">=</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="p">[])</span>
|
||||
</span><span id="L-33"><a href="#L-33"><span class="linenos"> 33</span></a>
|
||||
</span><span id="L-34"><a href="#L-34"><span class="linenos"> 34</span></a> <span class="c1"># Reverse the joins so we can remove chains of unused joins</span>
|
||||
</span><span id="L-35"><a href="#L-35"><span class="linenos"> 35</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="nb">reversed</span><span class="p">(</span><span class="n">joins</span><span class="p">):</span>
|
||||
</span><span id="L-36"><a href="#L-36"><span class="linenos"> 36</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="L-37"><a href="#L-37"><span class="linenos"> 37</span></a> <span class="k">if</span> <span class="n">_should_eliminate_join</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">join</span><span class="p">,</span> <span class="n">alias</span><span class="p">):</span>
|
||||
</span><span id="L-38"><a href="#L-38"><span class="linenos"> 38</span></a> <span class="n">join</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span>
|
||||
</span><span id="L-39"><a href="#L-39"><span class="linenos"> 39</span></a> <span class="n">scope</span><span class="o">.</span><span class="n">remove_source</span><span class="p">(</span><span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="L-40"><a href="#L-40"><span class="linenos"> 40</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-6"><a href="#L-6"><span class="linenos"> 6</span></a><span class="k">def</span> <span class="nf">eliminate_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="L-7"><a href="#L-7"><span class="linenos"> 7</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-8"><a href="#L-8"><span class="linenos"> 8</span></a><span class="sd"> Remove unused joins from an expression.</span>
|
||||
</span><span id="L-9"><a href="#L-9"><span class="linenos"> 9</span></a>
|
||||
</span><span id="L-10"><a href="#L-10"><span class="linenos"> 10</span></a><span class="sd"> This only removes joins when we know that the join condition doesn't produce duplicate rows.</span>
|
||||
</span><span id="L-11"><a href="#L-11"><span class="linenos"> 11</span></a>
|
||||
</span><span id="L-12"><a href="#L-12"><span class="linenos"> 12</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="L-13"><a href="#L-13"><span class="linenos"> 13</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="L-14"><a href="#L-14"><span class="linenos"> 14</span></a><span class="sd"> >>> sql = "SELECT x.a FROM x LEFT JOIN (SELECT DISTINCT y.b FROM y) AS y ON x.b = y.b"</span>
|
||||
</span><span id="L-15"><a href="#L-15"><span class="linenos"> 15</span></a><span class="sd"> >>> expression = sqlglot.parse_one(sql)</span>
|
||||
</span><span id="L-16"><a href="#L-16"><span class="linenos"> 16</span></a><span class="sd"> >>> eliminate_joins(expression).sql()</span>
|
||||
</span><span id="L-17"><a href="#L-17"><span class="linenos"> 17</span></a><span class="sd"> 'SELECT x.a FROM x'</span>
|
||||
</span><span id="L-18"><a href="#L-18"><span class="linenos"> 18</span></a>
|
||||
</span><span id="L-19"><a href="#L-19"><span class="linenos"> 19</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-20"><a href="#L-20"><span class="linenos"> 20</span></a><span class="sd"> expression (sqlglot.Expression): expression to optimize</span>
|
||||
</span><span id="L-21"><a href="#L-21"><span class="linenos"> 21</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="L-22"><a href="#L-22"><span class="linenos"> 22</span></a><span class="sd"> sqlglot.Expression: optimized expression</span>
|
||||
</span><span id="L-23"><a href="#L-23"><span class="linenos"> 23</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-24"><a href="#L-24"><span class="linenos"> 24</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">traverse_scope</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="L-25"><a href="#L-25"><span class="linenos"> 25</span></a> <span class="c1"># If any columns in this scope aren't qualified, it's hard to determine if a join isn't used.</span>
|
||||
</span><span id="L-26"><a href="#L-26"><span class="linenos"> 26</span></a> <span class="c1"># It's probably possible to infer this from the outputs of derived tables.</span>
|
||||
</span><span id="L-27"><a href="#L-27"><span class="linenos"> 27</span></a> <span class="c1"># But for now, let's just skip this rule.</span>
|
||||
</span><span id="L-28"><a href="#L-28"><span class="linenos"> 28</span></a> <span class="k">if</span> <span class="n">scope</span><span class="o">.</span><span class="n">unqualified_columns</span><span class="p">:</span>
|
||||
</span><span id="L-29"><a href="#L-29"><span class="linenos"> 29</span></a> <span class="k">continue</span>
|
||||
</span><span id="L-30"><a href="#L-30"><span class="linenos"> 30</span></a>
|
||||
</span><span id="L-31"><a href="#L-31"><span class="linenos"> 31</span></a> <span class="n">joins</span> <span class="o">=</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="p">[])</span>
|
||||
</span><span id="L-32"><a href="#L-32"><span class="linenos"> 32</span></a>
|
||||
</span><span id="L-33"><a href="#L-33"><span class="linenos"> 33</span></a> <span class="c1"># Reverse the joins so we can remove chains of unused joins</span>
|
||||
</span><span id="L-34"><a href="#L-34"><span class="linenos"> 34</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="nb">reversed</span><span class="p">(</span><span class="n">joins</span><span class="p">):</span>
|
||||
</span><span id="L-35"><a href="#L-35"><span class="linenos"> 35</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="L-36"><a href="#L-36"><span class="linenos"> 36</span></a> <span class="k">if</span> <span class="n">_should_eliminate_join</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">join</span><span class="p">,</span> <span class="n">alias</span><span class="p">):</span>
|
||||
</span><span id="L-37"><a href="#L-37"><span class="linenos"> 37</span></a> <span class="n">join</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span>
|
||||
</span><span id="L-38"><a href="#L-38"><span class="linenos"> 38</span></a> <span class="n">scope</span><span class="o">.</span><span class="n">remove_source</span><span class="p">(</span><span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="L-39"><a href="#L-39"><span class="linenos"> 39</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-40"><a href="#L-40"><span class="linenos"> 40</span></a>
|
||||
</span><span id="L-41"><a href="#L-41"><span class="linenos"> 41</span></a>
|
||||
</span><span id="L-42"><a href="#L-42"><span class="linenos"> 42</span></a>
|
||||
</span><span id="L-43"><a href="#L-43"><span class="linenos"> 43</span></a><span class="k">def</span> <span class="nf">_should_eliminate_join</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">join</span><span class="p">,</span> <span class="n">alias</span><span class="p">):</span>
|
||||
</span><span id="L-44"><a href="#L-44"><span class="linenos"> 44</span></a> <span class="n">inner_source</span> <span class="o">=</span> <span class="n">scope</span><span class="o">.</span><span class="n">sources</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="L-45"><a href="#L-45"><span class="linenos"> 45</span></a> <span class="k">return</span> <span class="p">(</span>
|
||||
</span><span id="L-46"><a href="#L-46"><span class="linenos"> 46</span></a> <span class="nb">isinstance</span><span class="p">(</span><span class="n">inner_source</span><span class="p">,</span> <span class="n">Scope</span><span class="p">)</span>
|
||||
</span><span id="L-47"><a href="#L-47"><span class="linenos"> 47</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="n">_join_is_used</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">join</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="L-48"><a href="#L-48"><span class="linenos"> 48</span></a> <span class="ow">and</span> <span class="p">(</span>
|
||||
</span><span id="L-49"><a href="#L-49"><span class="linenos"> 49</span></a> <span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">side</span> <span class="o">==</span> <span class="s2">"LEFT"</span> <span class="ow">and</span> <span class="n">_is_joined_on_all_unique_outputs</span><span class="p">(</span><span class="n">inner_source</span><span class="p">,</span> <span class="n">join</span><span class="p">))</span>
|
||||
</span><span id="L-50"><a href="#L-50"><span class="linenos"> 50</span></a> <span class="ow">or</span> <span class="p">(</span><span class="ow">not</span> <span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)</span> <span class="ow">and</span> <span class="n">_has_single_output_row</span><span class="p">(</span><span class="n">inner_source</span><span class="p">))</span>
|
||||
</span><span id="L-51"><a href="#L-51"><span class="linenos"> 51</span></a> <span class="p">)</span>
|
||||
</span><span id="L-52"><a href="#L-52"><span class="linenos"> 52</span></a> <span class="p">)</span>
|
||||
</span><span id="L-42"><a href="#L-42"><span class="linenos"> 42</span></a><span class="k">def</span> <span class="nf">_should_eliminate_join</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">join</span><span class="p">,</span> <span class="n">alias</span><span class="p">):</span>
|
||||
</span><span id="L-43"><a href="#L-43"><span class="linenos"> 43</span></a> <span class="n">inner_source</span> <span class="o">=</span> <span class="n">scope</span><span class="o">.</span><span class="n">sources</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="L-44"><a href="#L-44"><span class="linenos"> 44</span></a> <span class="k">return</span> <span class="p">(</span>
|
||||
</span><span id="L-45"><a href="#L-45"><span class="linenos"> 45</span></a> <span class="nb">isinstance</span><span class="p">(</span><span class="n">inner_source</span><span class="p">,</span> <span class="n">Scope</span><span class="p">)</span>
|
||||
</span><span id="L-46"><a href="#L-46"><span class="linenos"> 46</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="n">_join_is_used</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">join</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="L-47"><a href="#L-47"><span class="linenos"> 47</span></a> <span class="ow">and</span> <span class="p">(</span>
|
||||
</span><span id="L-48"><a href="#L-48"><span class="linenos"> 48</span></a> <span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">side</span> <span class="o">==</span> <span class="s2">"LEFT"</span> <span class="ow">and</span> <span class="n">_is_joined_on_all_unique_outputs</span><span class="p">(</span><span class="n">inner_source</span><span class="p">,</span> <span class="n">join</span><span class="p">))</span>
|
||||
</span><span id="L-49"><a href="#L-49"><span class="linenos"> 49</span></a> <span class="ow">or</span> <span class="p">(</span><span class="ow">not</span> <span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)</span> <span class="ow">and</span> <span class="n">_has_single_output_row</span><span class="p">(</span><span class="n">inner_source</span><span class="p">))</span>
|
||||
</span><span id="L-50"><a href="#L-50"><span class="linenos"> 50</span></a> <span class="p">)</span>
|
||||
</span><span id="L-51"><a href="#L-51"><span class="linenos"> 51</span></a> <span class="p">)</span>
|
||||
</span><span id="L-52"><a href="#L-52"><span class="linenos"> 52</span></a>
|
||||
</span><span id="L-53"><a href="#L-53"><span class="linenos"> 53</span></a>
|
||||
</span><span id="L-54"><a href="#L-54"><span class="linenos"> 54</span></a>
|
||||
</span><span id="L-55"><a href="#L-55"><span class="linenos"> 55</span></a><span class="k">def</span> <span class="nf">_join_is_used</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">join</span><span class="p">,</span> <span class="n">alias</span><span class="p">):</span>
|
||||
</span><span id="L-56"><a href="#L-56"><span class="linenos"> 56</span></a> <span class="c1"># We need to find all columns that reference this join.</span>
|
||||
</span><span id="L-57"><a href="#L-57"><span class="linenos"> 57</span></a> <span class="c1"># But columns in the ON clause shouldn't count.</span>
|
||||
</span><span id="L-58"><a href="#L-58"><span class="linenos"> 58</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)</span>
|
||||
</span><span id="L-59"><a href="#L-59"><span class="linenos"> 59</span></a> <span class="k">if</span> <span class="n">on</span><span class="p">:</span>
|
||||
</span><span id="L-60"><a href="#L-60"><span class="linenos"> 60</span></a> <span class="n">on_clause_columns</span> <span class="o">=</span> <span class="p">{</span><span class="nb">id</span><span class="p">(</span><span class="n">column</span><span class="p">)</span> <span class="k">for</span> <span class="n">column</span> <span class="ow">in</span> <span class="n">on</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">)}</span>
|
||||
</span><span id="L-61"><a href="#L-61"><span class="linenos"> 61</span></a> <span class="k">else</span><span class="p">:</span>
|
||||
</span><span id="L-62"><a href="#L-62"><span class="linenos"> 62</span></a> <span class="n">on_clause_columns</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>
|
||||
</span><span id="L-63"><a href="#L-63"><span class="linenos"> 63</span></a> <span class="k">return</span> <span class="nb">any</span><span class="p">(</span>
|
||||
</span><span id="L-64"><a href="#L-64"><span class="linenos"> 64</span></a> <span class="n">column</span> <span class="k">for</span> <span class="n">column</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">source_columns</span><span class="p">(</span><span class="n">alias</span><span class="p">)</span> <span class="k">if</span> <span class="nb">id</span><span class="p">(</span><span class="n">column</span><span class="p">)</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">on_clause_columns</span>
|
||||
</span><span id="L-65"><a href="#L-65"><span class="linenos"> 65</span></a> <span class="p">)</span>
|
||||
</span><span id="L-54"><a href="#L-54"><span class="linenos"> 54</span></a><span class="k">def</span> <span class="nf">_join_is_used</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">join</span><span class="p">,</span> <span class="n">alias</span><span class="p">):</span>
|
||||
</span><span id="L-55"><a href="#L-55"><span class="linenos"> 55</span></a> <span class="c1"># We need to find all columns that reference this join.</span>
|
||||
</span><span id="L-56"><a href="#L-56"><span class="linenos"> 56</span></a> <span class="c1"># But columns in the ON clause shouldn't count.</span>
|
||||
</span><span id="L-57"><a href="#L-57"><span class="linenos"> 57</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)</span>
|
||||
</span><span id="L-58"><a href="#L-58"><span class="linenos"> 58</span></a> <span class="k">if</span> <span class="n">on</span><span class="p">:</span>
|
||||
</span><span id="L-59"><a href="#L-59"><span class="linenos"> 59</span></a> <span class="n">on_clause_columns</span> <span class="o">=</span> <span class="p">{</span><span class="nb">id</span><span class="p">(</span><span class="n">column</span><span class="p">)</span> <span class="k">for</span> <span class="n">column</span> <span class="ow">in</span> <span class="n">on</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">)}</span>
|
||||
</span><span id="L-60"><a href="#L-60"><span class="linenos"> 60</span></a> <span class="k">else</span><span class="p">:</span>
|
||||
</span><span id="L-61"><a href="#L-61"><span class="linenos"> 61</span></a> <span class="n">on_clause_columns</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>
|
||||
</span><span id="L-62"><a href="#L-62"><span class="linenos"> 62</span></a> <span class="k">return</span> <span class="nb">any</span><span class="p">(</span>
|
||||
</span><span id="L-63"><a href="#L-63"><span class="linenos"> 63</span></a> <span class="n">column</span> <span class="k">for</span> <span class="n">column</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">source_columns</span><span class="p">(</span><span class="n">alias</span><span class="p">)</span> <span class="k">if</span> <span class="nb">id</span><span class="p">(</span><span class="n">column</span><span class="p">)</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">on_clause_columns</span>
|
||||
</span><span id="L-64"><a href="#L-64"><span class="linenos"> 64</span></a> <span class="p">)</span>
|
||||
</span><span id="L-65"><a href="#L-65"><span class="linenos"> 65</span></a>
|
||||
</span><span id="L-66"><a href="#L-66"><span class="linenos"> 66</span></a>
|
||||
</span><span id="L-67"><a href="#L-67"><span class="linenos"> 67</span></a>
|
||||
</span><span id="L-68"><a href="#L-68"><span class="linenos"> 68</span></a><span class="k">def</span> <span class="nf">_is_joined_on_all_unique_outputs</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">join</span><span class="p">):</span>
|
||||
</span><span id="L-69"><a href="#L-69"><span class="linenos"> 69</span></a> <span class="n">unique_outputs</span> <span class="o">=</span> <span class="n">_unique_outputs</span><span class="p">(</span><span class="n">scope</span><span class="p">)</span>
|
||||
</span><span id="L-70"><a href="#L-70"><span class="linenos"> 70</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">unique_outputs</span><span class="p">:</span>
|
||||
</span><span id="L-71"><a href="#L-71"><span class="linenos"> 71</span></a> <span class="k">return</span> <span class="kc">False</span>
|
||||
</span><span id="L-72"><a href="#L-72"><span class="linenos"> 72</span></a>
|
||||
</span><span id="L-73"><a href="#L-73"><span class="linenos"> 73</span></a> <span class="n">_</span><span class="p">,</span> <span class="n">join_keys</span><span class="p">,</span> <span class="n">_</span> <span class="o">=</span> <span class="n">join_condition</span><span class="p">(</span><span class="n">join</span><span class="p">)</span>
|
||||
</span><span id="L-74"><a href="#L-74"><span class="linenos"> 74</span></a> <span class="n">remaining_unique_outputs</span> <span class="o">=</span> <span class="n">unique_outputs</span> <span class="o">-</span> <span class="p">{</span><span class="n">c</span><span class="o">.</span><span class="n">name</span> <span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="n">join_keys</span><span class="p">}</span>
|
||||
</span><span id="L-75"><a href="#L-75"><span class="linenos"> 75</span></a> <span class="k">return</span> <span class="ow">not</span> <span class="n">remaining_unique_outputs</span>
|
||||
</span><span id="L-67"><a href="#L-67"><span class="linenos"> 67</span></a><span class="k">def</span> <span class="nf">_is_joined_on_all_unique_outputs</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">join</span><span class="p">):</span>
|
||||
</span><span id="L-68"><a href="#L-68"><span class="linenos"> 68</span></a> <span class="n">unique_outputs</span> <span class="o">=</span> <span class="n">_unique_outputs</span><span class="p">(</span><span class="n">scope</span><span class="p">)</span>
|
||||
</span><span id="L-69"><a href="#L-69"><span class="linenos"> 69</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">unique_outputs</span><span class="p">:</span>
|
||||
</span><span id="L-70"><a href="#L-70"><span class="linenos"> 70</span></a> <span class="k">return</span> <span class="kc">False</span>
|
||||
</span><span id="L-71"><a href="#L-71"><span class="linenos"> 71</span></a>
|
||||
</span><span id="L-72"><a href="#L-72"><span class="linenos"> 72</span></a> <span class="n">_</span><span class="p">,</span> <span class="n">join_keys</span><span class="p">,</span> <span class="n">_</span> <span class="o">=</span> <span class="n">join_condition</span><span class="p">(</span><span class="n">join</span><span class="p">)</span>
|
||||
</span><span id="L-73"><a href="#L-73"><span class="linenos"> 73</span></a> <span class="n">remaining_unique_outputs</span> <span class="o">=</span> <span class="n">unique_outputs</span> <span class="o">-</span> <span class="p">{</span><span class="n">c</span><span class="o">.</span><span class="n">name</span> <span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="n">join_keys</span><span class="p">}</span>
|
||||
</span><span id="L-74"><a href="#L-74"><span class="linenos"> 74</span></a> <span class="k">return</span> <span class="ow">not</span> <span class="n">remaining_unique_outputs</span>
|
||||
</span><span id="L-75"><a href="#L-75"><span class="linenos"> 75</span></a>
|
||||
</span><span id="L-76"><a href="#L-76"><span class="linenos"> 76</span></a>
|
||||
</span><span id="L-77"><a href="#L-77"><span class="linenos"> 77</span></a>
|
||||
</span><span id="L-78"><a href="#L-78"><span class="linenos"> 78</span></a><span class="k">def</span> <span class="nf">_unique_outputs</span><span class="p">(</span><span class="n">scope</span><span class="p">):</span>
|
||||
</span><span id="L-79"><a href="#L-79"><span class="linenos"> 79</span></a><span class="w"> </span><span class="sd">"""Determine output columns of `scope` that must have a unique combination per row"""</span>
|
||||
</span><span id="L-80"><a href="#L-80"><span class="linenos"> 80</span></a> <span class="k">if</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"distinct"</span><span class="p">):</span>
|
||||
</span><span id="L-81"><a href="#L-81"><span class="linenos"> 81</span></a> <span class="k">return</span> <span class="nb">set</span><span class="p">(</span><span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">named_selects</span><span class="p">)</span>
|
||||
</span><span id="L-82"><a href="#L-82"><span class="linenos"> 82</span></a>
|
||||
</span><span id="L-83"><a href="#L-83"><span class="linenos"> 83</span></a> <span class="n">group</span> <span class="o">=</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"group"</span><span class="p">)</span>
|
||||
</span><span id="L-84"><a href="#L-84"><span class="linenos"> 84</span></a> <span class="k">if</span> <span class="n">group</span><span class="p">:</span>
|
||||
</span><span id="L-85"><a href="#L-85"><span class="linenos"> 85</span></a> <span class="n">grouped_expressions</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">group</span><span class="o">.</span><span class="n">expressions</span><span class="p">)</span>
|
||||
</span><span id="L-86"><a href="#L-86"><span class="linenos"> 86</span></a> <span class="n">grouped_outputs</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>
|
||||
</span><span id="L-87"><a href="#L-87"><span class="linenos"> 87</span></a>
|
||||
</span><span id="L-88"><a href="#L-88"><span class="linenos"> 88</span></a> <span class="n">unique_outputs</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>
|
||||
</span><span id="L-89"><a href="#L-89"><span class="linenos"> 89</span></a> <span class="k">for</span> <span class="n">select</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">selects</span><span class="p">:</span>
|
||||
</span><span id="L-90"><a href="#L-90"><span class="linenos"> 90</span></a> <span class="n">output</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">unalias</span><span class="p">()</span>
|
||||
</span><span id="L-91"><a href="#L-91"><span class="linenos"> 91</span></a> <span class="k">if</span> <span class="n">output</span> <span class="ow">in</span> <span class="n">grouped_expressions</span><span class="p">:</span>
|
||||
</span><span id="L-92"><a href="#L-92"><span class="linenos"> 92</span></a> <span class="n">grouped_outputs</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">output</span><span class="p">)</span>
|
||||
</span><span id="L-93"><a href="#L-93"><span class="linenos"> 93</span></a> <span class="n">unique_outputs</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">select</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">)</span>
|
||||
</span><span id="L-94"><a href="#L-94"><span class="linenos"> 94</span></a>
|
||||
</span><span id="L-95"><a href="#L-95"><span class="linenos"> 95</span></a> <span class="c1"># All the grouped expressions must be in the output</span>
|
||||
</span><span id="L-96"><a href="#L-96"><span class="linenos"> 96</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">grouped_expressions</span><span class="o">.</span><span class="n">difference</span><span class="p">(</span><span class="n">grouped_outputs</span><span class="p">):</span>
|
||||
</span><span id="L-97"><a href="#L-97"><span class="linenos"> 97</span></a> <span class="k">return</span> <span class="n">unique_outputs</span>
|
||||
</span><span id="L-98"><a href="#L-98"><span class="linenos"> 98</span></a> <span class="k">else</span><span class="p">:</span>
|
||||
</span><span id="L-99"><a href="#L-99"><span class="linenos"> 99</span></a> <span class="k">return</span> <span class="nb">set</span><span class="p">()</span>
|
||||
</span><span id="L-100"><a href="#L-100"><span class="linenos">100</span></a>
|
||||
</span><span id="L-101"><a href="#L-101"><span class="linenos">101</span></a> <span class="k">if</span> <span class="n">_has_single_output_row</span><span class="p">(</span><span class="n">scope</span><span class="p">):</span>
|
||||
</span><span id="L-102"><a href="#L-102"><span class="linenos">102</span></a> <span class="k">return</span> <span class="nb">set</span><span class="p">(</span><span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">named_selects</span><span class="p">)</span>
|
||||
</span><span id="L-103"><a href="#L-103"><span class="linenos">103</span></a>
|
||||
</span><span id="L-104"><a href="#L-104"><span class="linenos">104</span></a> <span class="k">return</span> <span class="nb">set</span><span class="p">()</span>
|
||||
</span><span id="L-77"><a href="#L-77"><span class="linenos"> 77</span></a><span class="k">def</span> <span class="nf">_unique_outputs</span><span class="p">(</span><span class="n">scope</span><span class="p">):</span>
|
||||
</span><span id="L-78"><a href="#L-78"><span class="linenos"> 78</span></a><span class="w"> </span><span class="sd">"""Determine output columns of `scope` that must have a unique combination per row"""</span>
|
||||
</span><span id="L-79"><a href="#L-79"><span class="linenos"> 79</span></a> <span class="k">if</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"distinct"</span><span class="p">):</span>
|
||||
</span><span id="L-80"><a href="#L-80"><span class="linenos"> 80</span></a> <span class="k">return</span> <span class="nb">set</span><span class="p">(</span><span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">named_selects</span><span class="p">)</span>
|
||||
</span><span id="L-81"><a href="#L-81"><span class="linenos"> 81</span></a>
|
||||
</span><span id="L-82"><a href="#L-82"><span class="linenos"> 82</span></a> <span class="n">group</span> <span class="o">=</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"group"</span><span class="p">)</span>
|
||||
</span><span id="L-83"><a href="#L-83"><span class="linenos"> 83</span></a> <span class="k">if</span> <span class="n">group</span><span class="p">:</span>
|
||||
</span><span id="L-84"><a href="#L-84"><span class="linenos"> 84</span></a> <span class="n">grouped_expressions</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">group</span><span class="o">.</span><span class="n">expressions</span><span class="p">)</span>
|
||||
</span><span id="L-85"><a href="#L-85"><span class="linenos"> 85</span></a> <span class="n">grouped_outputs</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>
|
||||
</span><span id="L-86"><a href="#L-86"><span class="linenos"> 86</span></a>
|
||||
</span><span id="L-87"><a href="#L-87"><span class="linenos"> 87</span></a> <span class="n">unique_outputs</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>
|
||||
</span><span id="L-88"><a href="#L-88"><span class="linenos"> 88</span></a> <span class="k">for</span> <span class="n">select</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">selects</span><span class="p">:</span>
|
||||
</span><span id="L-89"><a href="#L-89"><span class="linenos"> 89</span></a> <span class="n">output</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">unalias</span><span class="p">()</span>
|
||||
</span><span id="L-90"><a href="#L-90"><span class="linenos"> 90</span></a> <span class="k">if</span> <span class="n">output</span> <span class="ow">in</span> <span class="n">grouped_expressions</span><span class="p">:</span>
|
||||
</span><span id="L-91"><a href="#L-91"><span class="linenos"> 91</span></a> <span class="n">grouped_outputs</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">output</span><span class="p">)</span>
|
||||
</span><span id="L-92"><a href="#L-92"><span class="linenos"> 92</span></a> <span class="n">unique_outputs</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">select</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">)</span>
|
||||
</span><span id="L-93"><a href="#L-93"><span class="linenos"> 93</span></a>
|
||||
</span><span id="L-94"><a href="#L-94"><span class="linenos"> 94</span></a> <span class="c1"># All the grouped expressions must be in the output</span>
|
||||
</span><span id="L-95"><a href="#L-95"><span class="linenos"> 95</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">grouped_expressions</span><span class="o">.</span><span class="n">difference</span><span class="p">(</span><span class="n">grouped_outputs</span><span class="p">):</span>
|
||||
</span><span id="L-96"><a href="#L-96"><span class="linenos"> 96</span></a> <span class="k">return</span> <span class="n">unique_outputs</span>
|
||||
</span><span id="L-97"><a href="#L-97"><span class="linenos"> 97</span></a> <span class="k">else</span><span class="p">:</span>
|
||||
</span><span id="L-98"><a href="#L-98"><span class="linenos"> 98</span></a> <span class="k">return</span> <span class="nb">set</span><span class="p">()</span>
|
||||
</span><span id="L-99"><a href="#L-99"><span class="linenos"> 99</span></a>
|
||||
</span><span id="L-100"><a href="#L-100"><span class="linenos">100</span></a> <span class="k">if</span> <span class="n">_has_single_output_row</span><span class="p">(</span><span class="n">scope</span><span class="p">):</span>
|
||||
</span><span id="L-101"><a href="#L-101"><span class="linenos">101</span></a> <span class="k">return</span> <span class="nb">set</span><span class="p">(</span><span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">named_selects</span><span class="p">)</span>
|
||||
</span><span id="L-102"><a href="#L-102"><span class="linenos">102</span></a>
|
||||
</span><span id="L-103"><a href="#L-103"><span class="linenos">103</span></a> <span class="k">return</span> <span class="nb">set</span><span class="p">()</span>
|
||||
</span><span id="L-104"><a href="#L-104"><span class="linenos">104</span></a>
|
||||
</span><span id="L-105"><a href="#L-105"><span class="linenos">105</span></a>
|
||||
</span><span id="L-106"><a href="#L-106"><span class="linenos">106</span></a>
|
||||
</span><span id="L-107"><a href="#L-107"><span class="linenos">107</span></a><span class="k">def</span> <span class="nf">_has_single_output_row</span><span class="p">(</span><span class="n">scope</span><span class="p">):</span>
|
||||
</span><span id="L-108"><a href="#L-108"><span class="linenos">108</span></a> <span class="k">return</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">)</span> <span class="ow">and</span> <span class="p">(</span>
|
||||
</span><span id="L-109"><a href="#L-109"><span class="linenos">109</span></a> <span class="nb">all</span><span class="p">(</span><span class="nb">isinstance</span><span class="p">(</span><span class="n">e</span><span class="o">.</span><span class="n">unalias</span><span class="p">(),</span> <span class="n">exp</span><span class="o">.</span><span class="n">AggFunc</span><span class="p">)</span> <span class="k">for</span> <span class="n">e</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">selects</span><span class="p">)</span>
|
||||
</span><span id="L-110"><a href="#L-110"><span class="linenos">110</span></a> <span class="ow">or</span> <span class="n">_is_limit_1</span><span class="p">(</span><span class="n">scope</span><span class="p">)</span>
|
||||
</span><span id="L-111"><a href="#L-111"><span class="linenos">111</span></a> <span class="ow">or</span> <span class="ow">not</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"from"</span><span class="p">)</span>
|
||||
</span><span id="L-112"><a href="#L-112"><span class="linenos">112</span></a> <span class="p">)</span>
|
||||
</span><span id="L-106"><a href="#L-106"><span class="linenos">106</span></a><span class="k">def</span> <span class="nf">_has_single_output_row</span><span class="p">(</span><span class="n">scope</span><span class="p">):</span>
|
||||
</span><span id="L-107"><a href="#L-107"><span class="linenos">107</span></a> <span class="k">return</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">)</span> <span class="ow">and</span> <span class="p">(</span>
|
||||
</span><span id="L-108"><a href="#L-108"><span class="linenos">108</span></a> <span class="nb">all</span><span class="p">(</span><span class="nb">isinstance</span><span class="p">(</span><span class="n">e</span><span class="o">.</span><span class="n">unalias</span><span class="p">(),</span> <span class="n">exp</span><span class="o">.</span><span class="n">AggFunc</span><span class="p">)</span> <span class="k">for</span> <span class="n">e</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">selects</span><span class="p">)</span>
|
||||
</span><span id="L-109"><a href="#L-109"><span class="linenos">109</span></a> <span class="ow">or</span> <span class="n">_is_limit_1</span><span class="p">(</span><span class="n">scope</span><span class="p">)</span>
|
||||
</span><span id="L-110"><a href="#L-110"><span class="linenos">110</span></a> <span class="ow">or</span> <span class="ow">not</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"from"</span><span class="p">)</span>
|
||||
</span><span id="L-111"><a href="#L-111"><span class="linenos">111</span></a> <span class="p">)</span>
|
||||
</span><span id="L-112"><a href="#L-112"><span class="linenos">112</span></a>
|
||||
</span><span id="L-113"><a href="#L-113"><span class="linenos">113</span></a>
|
||||
</span><span id="L-114"><a href="#L-114"><span class="linenos">114</span></a>
|
||||
</span><span id="L-115"><a href="#L-115"><span class="linenos">115</span></a><span class="k">def</span> <span class="nf">_is_limit_1</span><span class="p">(</span><span class="n">scope</span><span class="p">):</span>
|
||||
</span><span id="L-116"><a href="#L-116"><span class="linenos">116</span></a> <span class="n">limit</span> <span class="o">=</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"limit"</span><span class="p">)</span>
|
||||
</span><span id="L-117"><a href="#L-117"><span class="linenos">117</span></a> <span class="k">return</span> <span class="n">limit</span> <span class="ow">and</span> <span class="n">limit</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">this</span> <span class="o">==</span> <span class="s2">"1"</span>
|
||||
</span><span id="L-114"><a href="#L-114"><span class="linenos">114</span></a><span class="k">def</span> <span class="nf">_is_limit_1</span><span class="p">(</span><span class="n">scope</span><span class="p">):</span>
|
||||
</span><span id="L-115"><a href="#L-115"><span class="linenos">115</span></a> <span class="n">limit</span> <span class="o">=</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"limit"</span><span class="p">)</span>
|
||||
</span><span id="L-116"><a href="#L-116"><span class="linenos">116</span></a> <span class="k">return</span> <span class="n">limit</span> <span class="ow">and</span> <span class="n">limit</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">this</span> <span class="o">==</span> <span class="s2">"1"</span>
|
||||
</span><span id="L-117"><a href="#L-117"><span class="linenos">117</span></a>
|
||||
</span><span id="L-118"><a href="#L-118"><span class="linenos">118</span></a>
|
||||
</span><span id="L-119"><a href="#L-119"><span class="linenos">119</span></a>
|
||||
</span><span id="L-120"><a href="#L-120"><span class="linenos">120</span></a><span class="k">def</span> <span class="nf">join_condition</span><span class="p">(</span><span class="n">join</span><span class="p">):</span>
|
||||
</span><span id="L-121"><a href="#L-121"><span class="linenos">121</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-122"><a href="#L-122"><span class="linenos">122</span></a><span class="sd"> Extract the join condition from a join expression.</span>
|
||||
</span><span id="L-123"><a href="#L-123"><span class="linenos">123</span></a>
|
||||
</span><span id="L-124"><a href="#L-124"><span class="linenos">124</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-125"><a href="#L-125"><span class="linenos">125</span></a><span class="sd"> join (exp.Join)</span>
|
||||
</span><span id="L-126"><a href="#L-126"><span class="linenos">126</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="L-127"><a href="#L-127"><span class="linenos">127</span></a><span class="sd"> tuple[list[str], list[str], exp.Expression]:</span>
|
||||
</span><span id="L-128"><a href="#L-128"><span class="linenos">128</span></a><span class="sd"> Tuple of (source key, join key, remaining predicate)</span>
|
||||
</span><span id="L-129"><a href="#L-129"><span class="linenos">129</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-130"><a href="#L-130"><span class="linenos">130</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="L-131"><a href="#L-131"><span class="linenos">131</span></a> <span class="n">on</span> <span class="o">=</span> <span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)</span> <span class="ow">or</span> <span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span>
|
||||
</span><span id="L-132"><a href="#L-132"><span class="linenos">132</span></a> <span class="n">source_key</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
</span><span id="L-133"><a href="#L-133"><span class="linenos">133</span></a> <span class="n">join_key</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
</span><span id="L-134"><a href="#L-134"><span class="linenos">134</span></a>
|
||||
</span><span id="L-135"><a href="#L-135"><span class="linenos">135</span></a> <span class="k">def</span> <span class="nf">extract_condition</span><span class="p">(</span><span class="n">condition</span><span class="p">):</span>
|
||||
</span><span id="L-136"><a href="#L-136"><span class="linenos">136</span></a> <span class="n">left</span><span class="p">,</span> <span class="n">right</span> <span class="o">=</span> <span class="n">condition</span><span class="o">.</span><span class="n">unnest_operands</span><span class="p">()</span>
|
||||
</span><span id="L-137"><a href="#L-137"><span class="linenos">137</span></a> <span class="n">left_tables</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">left</span><span class="p">)</span>
|
||||
</span><span id="L-138"><a href="#L-138"><span class="linenos">138</span></a> <span class="n">right_tables</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">right</span><span class="p">)</span>
|
||||
</span><span id="L-139"><a href="#L-139"><span class="linenos">139</span></a>
|
||||
</span><span id="L-140"><a href="#L-140"><span class="linenos">140</span></a> <span class="k">if</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">left_tables</span> <span class="ow">and</span> <span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">right_tables</span><span class="p">:</span>
|
||||
</span><span id="L-141"><a href="#L-141"><span class="linenos">141</span></a> <span class="n">join_key</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">left</span><span class="p">)</span>
|
||||
</span><span id="L-142"><a href="#L-142"><span class="linenos">142</span></a> <span class="n">source_key</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">right</span><span class="p">)</span>
|
||||
</span><span id="L-143"><a href="#L-143"><span class="linenos">143</span></a> <span class="n">condition</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
|
||||
</span><span id="L-144"><a href="#L-144"><span class="linenos">144</span></a> <span class="k">elif</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">right_tables</span> <span class="ow">and</span> <span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">left_tables</span><span class="p">:</span>
|
||||
</span><span id="L-145"><a href="#L-145"><span class="linenos">145</span></a> <span class="n">join_key</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">right</span><span class="p">)</span>
|
||||
</span><span id="L-146"><a href="#L-146"><span class="linenos">146</span></a> <span class="n">source_key</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">left</span><span class="p">)</span>
|
||||
</span><span id="L-147"><a href="#L-147"><span class="linenos">147</span></a> <span class="n">condition</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
|
||||
</span><span id="L-148"><a href="#L-148"><span class="linenos">148</span></a>
|
||||
</span><span id="L-149"><a href="#L-149"><span class="linenos">149</span></a> <span class="c1"># find the join keys</span>
|
||||
</span><span id="L-150"><a href="#L-150"><span class="linenos">150</span></a> <span class="c1"># SELECT</span>
|
||||
</span><span id="L-151"><a href="#L-151"><span class="linenos">151</span></a> <span class="c1"># FROM x</span>
|
||||
</span><span id="L-152"><a href="#L-152"><span class="linenos">152</span></a> <span class="c1"># JOIN y</span>
|
||||
</span><span id="L-153"><a href="#L-153"><span class="linenos">153</span></a> <span class="c1"># ON x.a = y.b AND y.b > 1</span>
|
||||
</span><span id="L-154"><a href="#L-154"><span class="linenos">154</span></a> <span class="c1">#</span>
|
||||
</span><span id="L-155"><a href="#L-155"><span class="linenos">155</span></a> <span class="c1"># should pull y.b as the join key and x.a as the source key</span>
|
||||
</span><span id="L-156"><a href="#L-156"><span class="linenos">156</span></a> <span class="k">if</span> <span class="n">normalized</span><span class="p">(</span><span class="n">on</span><span class="p">):</span>
|
||||
</span><span id="L-157"><a href="#L-157"><span class="linenos">157</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">on</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span><span class="p">)</span> <span class="k">else</span> <span class="n">exp</span><span class="o">.</span><span class="n">and_</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
|
||||
</span><span id="L-158"><a href="#L-158"><span class="linenos">158</span></a>
|
||||
</span><span id="L-159"><a href="#L-159"><span class="linenos">159</span></a> <span class="k">for</span> <span class="n">condition</span> <span class="ow">in</span> <span class="n">on</span><span class="o">.</span><span class="n">flatten</span><span class="p">():</span>
|
||||
</span><span id="L-160"><a href="#L-160"><span class="linenos">160</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">condition</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">EQ</span><span class="p">):</span>
|
||||
</span><span id="L-161"><a href="#L-161"><span class="linenos">161</span></a> <span class="n">extract_condition</span><span class="p">(</span><span class="n">condition</span><span class="p">)</span>
|
||||
</span><span id="L-162"><a href="#L-162"><span class="linenos">162</span></a> <span class="k">elif</span> <span class="n">normalized</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
|
||||
</span><span id="L-163"><a href="#L-163"><span class="linenos">163</span></a> <span class="n">conditions</span> <span class="o">=</span> <span class="kc">None</span>
|
||||
</span><span id="L-164"><a href="#L-164"><span class="linenos">164</span></a>
|
||||
</span><span id="L-165"><a href="#L-165"><span class="linenos">165</span></a> <span class="k">for</span> <span class="n">condition</span> <span class="ow">in</span> <span class="n">on</span><span class="o">.</span><span class="n">flatten</span><span class="p">():</span>
|
||||
</span><span id="L-166"><a href="#L-166"><span class="linenos">166</span></a> <span class="n">parts</span> <span class="o">=</span> <span class="p">[</span><span class="n">part</span> <span class="k">for</span> <span class="n">part</span> <span class="ow">in</span> <span class="n">condition</span><span class="o">.</span><span class="n">flatten</span><span class="p">()</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">part</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">EQ</span><span class="p">)]</span>
|
||||
</span><span id="L-167"><a href="#L-167"><span class="linenos">167</span></a> <span class="k">if</span> <span class="n">conditions</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
|
||||
</span><span id="L-168"><a href="#L-168"><span class="linenos">168</span></a> <span class="n">conditions</span> <span class="o">=</span> <span class="n">parts</span>
|
||||
</span><span id="L-169"><a href="#L-169"><span class="linenos">169</span></a> <span class="k">else</span><span class="p">:</span>
|
||||
</span><span id="L-170"><a href="#L-170"><span class="linenos">170</span></a> <span class="n">temp</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
</span><span id="L-171"><a href="#L-171"><span class="linenos">171</span></a> <span class="k">for</span> <span class="n">p</span> <span class="ow">in</span> <span class="n">parts</span><span class="p">:</span>
|
||||
</span><span id="L-172"><a href="#L-172"><span class="linenos">172</span></a> <span class="n">cs</span> <span class="o">=</span> <span class="p">[</span><span class="n">c</span> <span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="n">conditions</span> <span class="k">if</span> <span class="n">p</span> <span class="o">==</span> <span class="n">c</span><span class="p">]</span>
|
||||
</span><span id="L-173"><a href="#L-173"><span class="linenos">173</span></a>
|
||||
</span><span id="L-174"><a href="#L-174"><span class="linenos">174</span></a> <span class="k">if</span> <span class="n">cs</span><span class="p">:</span>
|
||||
</span><span id="L-175"><a href="#L-175"><span class="linenos">175</span></a> <span class="n">temp</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">p</span><span class="p">)</span>
|
||||
</span><span id="L-176"><a href="#L-176"><span class="linenos">176</span></a> <span class="n">temp</span><span class="o">.</span><span class="n">extend</span><span class="p">(</span><span class="n">cs</span><span class="p">)</span>
|
||||
</span><span id="L-177"><a href="#L-177"><span class="linenos">177</span></a> <span class="n">conditions</span> <span class="o">=</span> <span class="n">temp</span>
|
||||
</span><span id="L-178"><a href="#L-178"><span class="linenos">178</span></a>
|
||||
</span><span id="L-179"><a href="#L-179"><span class="linenos">179</span></a> <span class="k">for</span> <span class="n">condition</span> <span class="ow">in</span> <span class="n">conditions</span><span class="p">:</span>
|
||||
</span><span id="L-180"><a href="#L-180"><span class="linenos">180</span></a> <span class="n">extract_condition</span><span class="p">(</span><span class="n">condition</span><span class="p">)</span>
|
||||
</span><span id="L-181"><a href="#L-181"><span class="linenos">181</span></a>
|
||||
</span><span id="L-182"><a href="#L-182"><span class="linenos">182</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">simplify</span><span class="p">(</span><span class="n">on</span><span class="p">)</span>
|
||||
</span><span id="L-183"><a href="#L-183"><span class="linenos">183</span></a> <span class="n">remaining_condition</span> <span class="o">=</span> <span class="kc">None</span> <span class="k">if</span> <span class="n">on</span> <span class="o">==</span> <span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">()</span> <span class="k">else</span> <span class="n">on</span>
|
||||
</span><span id="L-184"><a href="#L-184"><span class="linenos">184</span></a> <span class="k">return</span> <span class="n">source_key</span><span class="p">,</span> <span class="n">join_key</span><span class="p">,</span> <span class="n">remaining_condition</span>
|
||||
</span><span id="L-119"><a href="#L-119"><span class="linenos">119</span></a><span class="k">def</span> <span class="nf">join_condition</span><span class="p">(</span><span class="n">join</span><span class="p">):</span>
|
||||
</span><span id="L-120"><a href="#L-120"><span class="linenos">120</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-121"><a href="#L-121"><span class="linenos">121</span></a><span class="sd"> Extract the join condition from a join expression.</span>
|
||||
</span><span id="L-122"><a href="#L-122"><span class="linenos">122</span></a>
|
||||
</span><span id="L-123"><a href="#L-123"><span class="linenos">123</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-124"><a href="#L-124"><span class="linenos">124</span></a><span class="sd"> join (exp.Join)</span>
|
||||
</span><span id="L-125"><a href="#L-125"><span class="linenos">125</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="L-126"><a href="#L-126"><span class="linenos">126</span></a><span class="sd"> tuple[list[str], list[str], exp.Expression]:</span>
|
||||
</span><span id="L-127"><a href="#L-127"><span class="linenos">127</span></a><span class="sd"> Tuple of (source key, join key, remaining predicate)</span>
|
||||
</span><span id="L-128"><a href="#L-128"><span class="linenos">128</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-129"><a href="#L-129"><span class="linenos">129</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="L-130"><a href="#L-130"><span class="linenos">130</span></a> <span class="n">on</span> <span class="o">=</span> <span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)</span> <span class="ow">or</span> <span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span>
|
||||
</span><span id="L-131"><a href="#L-131"><span class="linenos">131</span></a> <span class="n">source_key</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
</span><span id="L-132"><a href="#L-132"><span class="linenos">132</span></a> <span class="n">join_key</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
</span><span id="L-133"><a href="#L-133"><span class="linenos">133</span></a>
|
||||
</span><span id="L-134"><a href="#L-134"><span class="linenos">134</span></a> <span class="k">def</span> <span class="nf">extract_condition</span><span class="p">(</span><span class="n">condition</span><span class="p">):</span>
|
||||
</span><span id="L-135"><a href="#L-135"><span class="linenos">135</span></a> <span class="n">left</span><span class="p">,</span> <span class="n">right</span> <span class="o">=</span> <span class="n">condition</span><span class="o">.</span><span class="n">unnest_operands</span><span class="p">()</span>
|
||||
</span><span id="L-136"><a href="#L-136"><span class="linenos">136</span></a> <span class="n">left_tables</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">left</span><span class="p">)</span>
|
||||
</span><span id="L-137"><a href="#L-137"><span class="linenos">137</span></a> <span class="n">right_tables</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">right</span><span class="p">)</span>
|
||||
</span><span id="L-138"><a href="#L-138"><span class="linenos">138</span></a>
|
||||
</span><span id="L-139"><a href="#L-139"><span class="linenos">139</span></a> <span class="k">if</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">left_tables</span> <span class="ow">and</span> <span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">right_tables</span><span class="p">:</span>
|
||||
</span><span id="L-140"><a href="#L-140"><span class="linenos">140</span></a> <span class="n">join_key</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">left</span><span class="p">)</span>
|
||||
</span><span id="L-141"><a href="#L-141"><span class="linenos">141</span></a> <span class="n">source_key</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">right</span><span class="p">)</span>
|
||||
</span><span id="L-142"><a href="#L-142"><span class="linenos">142</span></a> <span class="n">condition</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
|
||||
</span><span id="L-143"><a href="#L-143"><span class="linenos">143</span></a> <span class="k">elif</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">right_tables</span> <span class="ow">and</span> <span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">left_tables</span><span class="p">:</span>
|
||||
</span><span id="L-144"><a href="#L-144"><span class="linenos">144</span></a> <span class="n">join_key</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">right</span><span class="p">)</span>
|
||||
</span><span id="L-145"><a href="#L-145"><span class="linenos">145</span></a> <span class="n">source_key</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">left</span><span class="p">)</span>
|
||||
</span><span id="L-146"><a href="#L-146"><span class="linenos">146</span></a> <span class="n">condition</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
|
||||
</span><span id="L-147"><a href="#L-147"><span class="linenos">147</span></a>
|
||||
</span><span id="L-148"><a href="#L-148"><span class="linenos">148</span></a> <span class="c1"># find the join keys</span>
|
||||
</span><span id="L-149"><a href="#L-149"><span class="linenos">149</span></a> <span class="c1"># SELECT</span>
|
||||
</span><span id="L-150"><a href="#L-150"><span class="linenos">150</span></a> <span class="c1"># FROM x</span>
|
||||
</span><span id="L-151"><a href="#L-151"><span class="linenos">151</span></a> <span class="c1"># JOIN y</span>
|
||||
</span><span id="L-152"><a href="#L-152"><span class="linenos">152</span></a> <span class="c1"># ON x.a = y.b AND y.b > 1</span>
|
||||
</span><span id="L-153"><a href="#L-153"><span class="linenos">153</span></a> <span class="c1">#</span>
|
||||
</span><span id="L-154"><a href="#L-154"><span class="linenos">154</span></a> <span class="c1"># should pull y.b as the join key and x.a as the source key</span>
|
||||
</span><span id="L-155"><a href="#L-155"><span class="linenos">155</span></a> <span class="k">if</span> <span class="n">normalized</span><span class="p">(</span><span class="n">on</span><span class="p">):</span>
|
||||
</span><span id="L-156"><a href="#L-156"><span class="linenos">156</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">on</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span><span class="p">)</span> <span class="k">else</span> <span class="n">exp</span><span class="o">.</span><span class="n">and_</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
|
||||
</span><span id="L-157"><a href="#L-157"><span class="linenos">157</span></a>
|
||||
</span><span id="L-158"><a href="#L-158"><span class="linenos">158</span></a> <span class="k">for</span> <span class="n">condition</span> <span class="ow">in</span> <span class="n">on</span><span class="o">.</span><span class="n">flatten</span><span class="p">():</span>
|
||||
</span><span id="L-159"><a href="#L-159"><span class="linenos">159</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">condition</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">EQ</span><span class="p">):</span>
|
||||
</span><span id="L-160"><a href="#L-160"><span class="linenos">160</span></a> <span class="n">extract_condition</span><span class="p">(</span><span class="n">condition</span><span class="p">)</span>
|
||||
</span><span id="L-161"><a href="#L-161"><span class="linenos">161</span></a> <span class="k">elif</span> <span class="n">normalized</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
|
||||
</span><span id="L-162"><a href="#L-162"><span class="linenos">162</span></a> <span class="n">conditions</span> <span class="o">=</span> <span class="kc">None</span>
|
||||
</span><span id="L-163"><a href="#L-163"><span class="linenos">163</span></a>
|
||||
</span><span id="L-164"><a href="#L-164"><span class="linenos">164</span></a> <span class="k">for</span> <span class="n">condition</span> <span class="ow">in</span> <span class="n">on</span><span class="o">.</span><span class="n">flatten</span><span class="p">():</span>
|
||||
</span><span id="L-165"><a href="#L-165"><span class="linenos">165</span></a> <span class="n">parts</span> <span class="o">=</span> <span class="p">[</span><span class="n">part</span> <span class="k">for</span> <span class="n">part</span> <span class="ow">in</span> <span class="n">condition</span><span class="o">.</span><span class="n">flatten</span><span class="p">()</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">part</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">EQ</span><span class="p">)]</span>
|
||||
</span><span id="L-166"><a href="#L-166"><span class="linenos">166</span></a> <span class="k">if</span> <span class="n">conditions</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
|
||||
</span><span id="L-167"><a href="#L-167"><span class="linenos">167</span></a> <span class="n">conditions</span> <span class="o">=</span> <span class="n">parts</span>
|
||||
</span><span id="L-168"><a href="#L-168"><span class="linenos">168</span></a> <span class="k">else</span><span class="p">:</span>
|
||||
</span><span id="L-169"><a href="#L-169"><span class="linenos">169</span></a> <span class="n">temp</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
</span><span id="L-170"><a href="#L-170"><span class="linenos">170</span></a> <span class="k">for</span> <span class="n">p</span> <span class="ow">in</span> <span class="n">parts</span><span class="p">:</span>
|
||||
</span><span id="L-171"><a href="#L-171"><span class="linenos">171</span></a> <span class="n">cs</span> <span class="o">=</span> <span class="p">[</span><span class="n">c</span> <span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="n">conditions</span> <span class="k">if</span> <span class="n">p</span> <span class="o">==</span> <span class="n">c</span><span class="p">]</span>
|
||||
</span><span id="L-172"><a href="#L-172"><span class="linenos">172</span></a>
|
||||
</span><span id="L-173"><a href="#L-173"><span class="linenos">173</span></a> <span class="k">if</span> <span class="n">cs</span><span class="p">:</span>
|
||||
</span><span id="L-174"><a href="#L-174"><span class="linenos">174</span></a> <span class="n">temp</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">p</span><span class="p">)</span>
|
||||
</span><span id="L-175"><a href="#L-175"><span class="linenos">175</span></a> <span class="n">temp</span><span class="o">.</span><span class="n">extend</span><span class="p">(</span><span class="n">cs</span><span class="p">)</span>
|
||||
</span><span id="L-176"><a href="#L-176"><span class="linenos">176</span></a> <span class="n">conditions</span> <span class="o">=</span> <span class="n">temp</span>
|
||||
</span><span id="L-177"><a href="#L-177"><span class="linenos">177</span></a>
|
||||
</span><span id="L-178"><a href="#L-178"><span class="linenos">178</span></a> <span class="k">for</span> <span class="n">condition</span> <span class="ow">in</span> <span class="n">conditions</span><span class="p">:</span>
|
||||
</span><span id="L-179"><a href="#L-179"><span class="linenos">179</span></a> <span class="n">extract_condition</span><span class="p">(</span><span class="n">condition</span><span class="p">)</span>
|
||||
</span><span id="L-180"><a href="#L-180"><span class="linenos">180</span></a>
|
||||
</span><span id="L-181"><a href="#L-181"><span class="linenos">181</span></a> <span class="k">return</span> <span class="n">source_key</span><span class="p">,</span> <span class="n">join_key</span><span class="p">,</span> <span class="n">on</span>
|
||||
</span></pre></div>
|
||||
|
||||
|
||||
|
|
@ -258,40 +255,40 @@
|
|||
|
||||
</div>
|
||||
<a class="headerlink" href="#eliminate_joins"></a>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="eliminate_joins-8"><a href="#eliminate_joins-8"><span class="linenos"> 8</span></a><span class="k">def</span> <span class="nf">eliminate_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="eliminate_joins-9"><a href="#eliminate_joins-9"><span class="linenos"> 9</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="eliminate_joins-10"><a href="#eliminate_joins-10"><span class="linenos">10</span></a><span class="sd"> Remove unused joins from an expression.</span>
|
||||
</span><span id="eliminate_joins-11"><a href="#eliminate_joins-11"><span class="linenos">11</span></a>
|
||||
</span><span id="eliminate_joins-12"><a href="#eliminate_joins-12"><span class="linenos">12</span></a><span class="sd"> This only removes joins when we know that the join condition doesn't produce duplicate rows.</span>
|
||||
</span><span id="eliminate_joins-13"><a href="#eliminate_joins-13"><span class="linenos">13</span></a>
|
||||
</span><span id="eliminate_joins-14"><a href="#eliminate_joins-14"><span class="linenos">14</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="eliminate_joins-15"><a href="#eliminate_joins-15"><span class="linenos">15</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="eliminate_joins-16"><a href="#eliminate_joins-16"><span class="linenos">16</span></a><span class="sd"> >>> sql = "SELECT x.a FROM x LEFT JOIN (SELECT DISTINCT y.b FROM y) AS y ON x.b = y.b"</span>
|
||||
</span><span id="eliminate_joins-17"><a href="#eliminate_joins-17"><span class="linenos">17</span></a><span class="sd"> >>> expression = sqlglot.parse_one(sql)</span>
|
||||
</span><span id="eliminate_joins-18"><a href="#eliminate_joins-18"><span class="linenos">18</span></a><span class="sd"> >>> eliminate_joins(expression).sql()</span>
|
||||
</span><span id="eliminate_joins-19"><a href="#eliminate_joins-19"><span class="linenos">19</span></a><span class="sd"> 'SELECT x.a FROM x'</span>
|
||||
</span><span id="eliminate_joins-20"><a href="#eliminate_joins-20"><span class="linenos">20</span></a>
|
||||
</span><span id="eliminate_joins-21"><a href="#eliminate_joins-21"><span class="linenos">21</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="eliminate_joins-22"><a href="#eliminate_joins-22"><span class="linenos">22</span></a><span class="sd"> expression (sqlglot.Expression): expression to optimize</span>
|
||||
</span><span id="eliminate_joins-23"><a href="#eliminate_joins-23"><span class="linenos">23</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="eliminate_joins-24"><a href="#eliminate_joins-24"><span class="linenos">24</span></a><span class="sd"> sqlglot.Expression: optimized expression</span>
|
||||
</span><span id="eliminate_joins-25"><a href="#eliminate_joins-25"><span class="linenos">25</span></a><span class="sd"> """</span>
|
||||
</span><span id="eliminate_joins-26"><a href="#eliminate_joins-26"><span class="linenos">26</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">traverse_scope</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="eliminate_joins-27"><a href="#eliminate_joins-27"><span class="linenos">27</span></a> <span class="c1"># If any columns in this scope aren't qualified, it's hard to determine if a join isn't used.</span>
|
||||
</span><span id="eliminate_joins-28"><a href="#eliminate_joins-28"><span class="linenos">28</span></a> <span class="c1"># It's probably possible to infer this from the outputs of derived tables.</span>
|
||||
</span><span id="eliminate_joins-29"><a href="#eliminate_joins-29"><span class="linenos">29</span></a> <span class="c1"># But for now, let's just skip this rule.</span>
|
||||
</span><span id="eliminate_joins-30"><a href="#eliminate_joins-30"><span class="linenos">30</span></a> <span class="k">if</span> <span class="n">scope</span><span class="o">.</span><span class="n">unqualified_columns</span><span class="p">:</span>
|
||||
</span><span id="eliminate_joins-31"><a href="#eliminate_joins-31"><span class="linenos">31</span></a> <span class="k">continue</span>
|
||||
</span><span id="eliminate_joins-32"><a href="#eliminate_joins-32"><span class="linenos">32</span></a>
|
||||
</span><span id="eliminate_joins-33"><a href="#eliminate_joins-33"><span class="linenos">33</span></a> <span class="n">joins</span> <span class="o">=</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="p">[])</span>
|
||||
</span><span id="eliminate_joins-34"><a href="#eliminate_joins-34"><span class="linenos">34</span></a>
|
||||
</span><span id="eliminate_joins-35"><a href="#eliminate_joins-35"><span class="linenos">35</span></a> <span class="c1"># Reverse the joins so we can remove chains of unused joins</span>
|
||||
</span><span id="eliminate_joins-36"><a href="#eliminate_joins-36"><span class="linenos">36</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="nb">reversed</span><span class="p">(</span><span class="n">joins</span><span class="p">):</span>
|
||||
</span><span id="eliminate_joins-37"><a href="#eliminate_joins-37"><span class="linenos">37</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="eliminate_joins-38"><a href="#eliminate_joins-38"><span class="linenos">38</span></a> <span class="k">if</span> <span class="n">_should_eliminate_join</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">join</span><span class="p">,</span> <span class="n">alias</span><span class="p">):</span>
|
||||
</span><span id="eliminate_joins-39"><a href="#eliminate_joins-39"><span class="linenos">39</span></a> <span class="n">join</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span>
|
||||
</span><span id="eliminate_joins-40"><a href="#eliminate_joins-40"><span class="linenos">40</span></a> <span class="n">scope</span><span class="o">.</span><span class="n">remove_source</span><span class="p">(</span><span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="eliminate_joins-41"><a href="#eliminate_joins-41"><span class="linenos">41</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="eliminate_joins-7"><a href="#eliminate_joins-7"><span class="linenos"> 7</span></a><span class="k">def</span> <span class="nf">eliminate_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="eliminate_joins-8"><a href="#eliminate_joins-8"><span class="linenos"> 8</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="eliminate_joins-9"><a href="#eliminate_joins-9"><span class="linenos"> 9</span></a><span class="sd"> Remove unused joins from an expression.</span>
|
||||
</span><span id="eliminate_joins-10"><a href="#eliminate_joins-10"><span class="linenos">10</span></a>
|
||||
</span><span id="eliminate_joins-11"><a href="#eliminate_joins-11"><span class="linenos">11</span></a><span class="sd"> This only removes joins when we know that the join condition doesn't produce duplicate rows.</span>
|
||||
</span><span id="eliminate_joins-12"><a href="#eliminate_joins-12"><span class="linenos">12</span></a>
|
||||
</span><span id="eliminate_joins-13"><a href="#eliminate_joins-13"><span class="linenos">13</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="eliminate_joins-14"><a href="#eliminate_joins-14"><span class="linenos">14</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="eliminate_joins-15"><a href="#eliminate_joins-15"><span class="linenos">15</span></a><span class="sd"> >>> sql = "SELECT x.a FROM x LEFT JOIN (SELECT DISTINCT y.b FROM y) AS y ON x.b = y.b"</span>
|
||||
</span><span id="eliminate_joins-16"><a href="#eliminate_joins-16"><span class="linenos">16</span></a><span class="sd"> >>> expression = sqlglot.parse_one(sql)</span>
|
||||
</span><span id="eliminate_joins-17"><a href="#eliminate_joins-17"><span class="linenos">17</span></a><span class="sd"> >>> eliminate_joins(expression).sql()</span>
|
||||
</span><span id="eliminate_joins-18"><a href="#eliminate_joins-18"><span class="linenos">18</span></a><span class="sd"> 'SELECT x.a FROM x'</span>
|
||||
</span><span id="eliminate_joins-19"><a href="#eliminate_joins-19"><span class="linenos">19</span></a>
|
||||
</span><span id="eliminate_joins-20"><a href="#eliminate_joins-20"><span class="linenos">20</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="eliminate_joins-21"><a href="#eliminate_joins-21"><span class="linenos">21</span></a><span class="sd"> expression (sqlglot.Expression): expression to optimize</span>
|
||||
</span><span id="eliminate_joins-22"><a href="#eliminate_joins-22"><span class="linenos">22</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="eliminate_joins-23"><a href="#eliminate_joins-23"><span class="linenos">23</span></a><span class="sd"> sqlglot.Expression: optimized expression</span>
|
||||
</span><span id="eliminate_joins-24"><a href="#eliminate_joins-24"><span class="linenos">24</span></a><span class="sd"> """</span>
|
||||
</span><span id="eliminate_joins-25"><a href="#eliminate_joins-25"><span class="linenos">25</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">traverse_scope</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="eliminate_joins-26"><a href="#eliminate_joins-26"><span class="linenos">26</span></a> <span class="c1"># If any columns in this scope aren't qualified, it's hard to determine if a join isn't used.</span>
|
||||
</span><span id="eliminate_joins-27"><a href="#eliminate_joins-27"><span class="linenos">27</span></a> <span class="c1"># It's probably possible to infer this from the outputs of derived tables.</span>
|
||||
</span><span id="eliminate_joins-28"><a href="#eliminate_joins-28"><span class="linenos">28</span></a> <span class="c1"># But for now, let's just skip this rule.</span>
|
||||
</span><span id="eliminate_joins-29"><a href="#eliminate_joins-29"><span class="linenos">29</span></a> <span class="k">if</span> <span class="n">scope</span><span class="o">.</span><span class="n">unqualified_columns</span><span class="p">:</span>
|
||||
</span><span id="eliminate_joins-30"><a href="#eliminate_joins-30"><span class="linenos">30</span></a> <span class="k">continue</span>
|
||||
</span><span id="eliminate_joins-31"><a href="#eliminate_joins-31"><span class="linenos">31</span></a>
|
||||
</span><span id="eliminate_joins-32"><a href="#eliminate_joins-32"><span class="linenos">32</span></a> <span class="n">joins</span> <span class="o">=</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="p">[])</span>
|
||||
</span><span id="eliminate_joins-33"><a href="#eliminate_joins-33"><span class="linenos">33</span></a>
|
||||
</span><span id="eliminate_joins-34"><a href="#eliminate_joins-34"><span class="linenos">34</span></a> <span class="c1"># Reverse the joins so we can remove chains of unused joins</span>
|
||||
</span><span id="eliminate_joins-35"><a href="#eliminate_joins-35"><span class="linenos">35</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="nb">reversed</span><span class="p">(</span><span class="n">joins</span><span class="p">):</span>
|
||||
</span><span id="eliminate_joins-36"><a href="#eliminate_joins-36"><span class="linenos">36</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="eliminate_joins-37"><a href="#eliminate_joins-37"><span class="linenos">37</span></a> <span class="k">if</span> <span class="n">_should_eliminate_join</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">join</span><span class="p">,</span> <span class="n">alias</span><span class="p">):</span>
|
||||
</span><span id="eliminate_joins-38"><a href="#eliminate_joins-38"><span class="linenos">38</span></a> <span class="n">join</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span>
|
||||
</span><span id="eliminate_joins-39"><a href="#eliminate_joins-39"><span class="linenos">39</span></a> <span class="n">scope</span><span class="o">.</span><span class="n">remove_source</span><span class="p">(</span><span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="eliminate_joins-40"><a href="#eliminate_joins-40"><span class="linenos">40</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span></pre></div>
|
||||
|
||||
|
||||
|
|
@ -338,71 +335,69 @@
|
|||
|
||||
</div>
|
||||
<a class="headerlink" href="#join_condition"></a>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="join_condition-121"><a href="#join_condition-121"><span class="linenos">121</span></a><span class="k">def</span> <span class="nf">join_condition</span><span class="p">(</span><span class="n">join</span><span class="p">):</span>
|
||||
</span><span id="join_condition-122"><a href="#join_condition-122"><span class="linenos">122</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="join_condition-123"><a href="#join_condition-123"><span class="linenos">123</span></a><span class="sd"> Extract the join condition from a join expression.</span>
|
||||
</span><span id="join_condition-124"><a href="#join_condition-124"><span class="linenos">124</span></a>
|
||||
</span><span id="join_condition-125"><a href="#join_condition-125"><span class="linenos">125</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="join_condition-126"><a href="#join_condition-126"><span class="linenos">126</span></a><span class="sd"> join (exp.Join)</span>
|
||||
</span><span id="join_condition-127"><a href="#join_condition-127"><span class="linenos">127</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="join_condition-128"><a href="#join_condition-128"><span class="linenos">128</span></a><span class="sd"> tuple[list[str], list[str], exp.Expression]:</span>
|
||||
</span><span id="join_condition-129"><a href="#join_condition-129"><span class="linenos">129</span></a><span class="sd"> Tuple of (source key, join key, remaining predicate)</span>
|
||||
</span><span id="join_condition-130"><a href="#join_condition-130"><span class="linenos">130</span></a><span class="sd"> """</span>
|
||||
</span><span id="join_condition-131"><a href="#join_condition-131"><span class="linenos">131</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="join_condition-132"><a href="#join_condition-132"><span class="linenos">132</span></a> <span class="n">on</span> <span class="o">=</span> <span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)</span> <span class="ow">or</span> <span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span>
|
||||
</span><span id="join_condition-133"><a href="#join_condition-133"><span class="linenos">133</span></a> <span class="n">source_key</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
</span><span id="join_condition-134"><a href="#join_condition-134"><span class="linenos">134</span></a> <span class="n">join_key</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
</span><span id="join_condition-135"><a href="#join_condition-135"><span class="linenos">135</span></a>
|
||||
</span><span id="join_condition-136"><a href="#join_condition-136"><span class="linenos">136</span></a> <span class="k">def</span> <span class="nf">extract_condition</span><span class="p">(</span><span class="n">condition</span><span class="p">):</span>
|
||||
</span><span id="join_condition-137"><a href="#join_condition-137"><span class="linenos">137</span></a> <span class="n">left</span><span class="p">,</span> <span class="n">right</span> <span class="o">=</span> <span class="n">condition</span><span class="o">.</span><span class="n">unnest_operands</span><span class="p">()</span>
|
||||
</span><span id="join_condition-138"><a href="#join_condition-138"><span class="linenos">138</span></a> <span class="n">left_tables</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">left</span><span class="p">)</span>
|
||||
</span><span id="join_condition-139"><a href="#join_condition-139"><span class="linenos">139</span></a> <span class="n">right_tables</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">right</span><span class="p">)</span>
|
||||
</span><span id="join_condition-140"><a href="#join_condition-140"><span class="linenos">140</span></a>
|
||||
</span><span id="join_condition-141"><a href="#join_condition-141"><span class="linenos">141</span></a> <span class="k">if</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">left_tables</span> <span class="ow">and</span> <span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">right_tables</span><span class="p">:</span>
|
||||
</span><span id="join_condition-142"><a href="#join_condition-142"><span class="linenos">142</span></a> <span class="n">join_key</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">left</span><span class="p">)</span>
|
||||
</span><span id="join_condition-143"><a href="#join_condition-143"><span class="linenos">143</span></a> <span class="n">source_key</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">right</span><span class="p">)</span>
|
||||
</span><span id="join_condition-144"><a href="#join_condition-144"><span class="linenos">144</span></a> <span class="n">condition</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
|
||||
</span><span id="join_condition-145"><a href="#join_condition-145"><span class="linenos">145</span></a> <span class="k">elif</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">right_tables</span> <span class="ow">and</span> <span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">left_tables</span><span class="p">:</span>
|
||||
</span><span id="join_condition-146"><a href="#join_condition-146"><span class="linenos">146</span></a> <span class="n">join_key</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">right</span><span class="p">)</span>
|
||||
</span><span id="join_condition-147"><a href="#join_condition-147"><span class="linenos">147</span></a> <span class="n">source_key</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">left</span><span class="p">)</span>
|
||||
</span><span id="join_condition-148"><a href="#join_condition-148"><span class="linenos">148</span></a> <span class="n">condition</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
|
||||
</span><span id="join_condition-149"><a href="#join_condition-149"><span class="linenos">149</span></a>
|
||||
</span><span id="join_condition-150"><a href="#join_condition-150"><span class="linenos">150</span></a> <span class="c1"># find the join keys</span>
|
||||
</span><span id="join_condition-151"><a href="#join_condition-151"><span class="linenos">151</span></a> <span class="c1"># SELECT</span>
|
||||
</span><span id="join_condition-152"><a href="#join_condition-152"><span class="linenos">152</span></a> <span class="c1"># FROM x</span>
|
||||
</span><span id="join_condition-153"><a href="#join_condition-153"><span class="linenos">153</span></a> <span class="c1"># JOIN y</span>
|
||||
</span><span id="join_condition-154"><a href="#join_condition-154"><span class="linenos">154</span></a> <span class="c1"># ON x.a = y.b AND y.b > 1</span>
|
||||
</span><span id="join_condition-155"><a href="#join_condition-155"><span class="linenos">155</span></a> <span class="c1">#</span>
|
||||
</span><span id="join_condition-156"><a href="#join_condition-156"><span class="linenos">156</span></a> <span class="c1"># should pull y.b as the join key and x.a as the source key</span>
|
||||
</span><span id="join_condition-157"><a href="#join_condition-157"><span class="linenos">157</span></a> <span class="k">if</span> <span class="n">normalized</span><span class="p">(</span><span class="n">on</span><span class="p">):</span>
|
||||
</span><span id="join_condition-158"><a href="#join_condition-158"><span class="linenos">158</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">on</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span><span class="p">)</span> <span class="k">else</span> <span class="n">exp</span><span class="o">.</span><span class="n">and_</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
|
||||
</span><span id="join_condition-159"><a href="#join_condition-159"><span class="linenos">159</span></a>
|
||||
</span><span id="join_condition-160"><a href="#join_condition-160"><span class="linenos">160</span></a> <span class="k">for</span> <span class="n">condition</span> <span class="ow">in</span> <span class="n">on</span><span class="o">.</span><span class="n">flatten</span><span class="p">():</span>
|
||||
</span><span id="join_condition-161"><a href="#join_condition-161"><span class="linenos">161</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">condition</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">EQ</span><span class="p">):</span>
|
||||
</span><span id="join_condition-162"><a href="#join_condition-162"><span class="linenos">162</span></a> <span class="n">extract_condition</span><span class="p">(</span><span class="n">condition</span><span class="p">)</span>
|
||||
</span><span id="join_condition-163"><a href="#join_condition-163"><span class="linenos">163</span></a> <span class="k">elif</span> <span class="n">normalized</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
|
||||
</span><span id="join_condition-164"><a href="#join_condition-164"><span class="linenos">164</span></a> <span class="n">conditions</span> <span class="o">=</span> <span class="kc">None</span>
|
||||
</span><span id="join_condition-165"><a href="#join_condition-165"><span class="linenos">165</span></a>
|
||||
</span><span id="join_condition-166"><a href="#join_condition-166"><span class="linenos">166</span></a> <span class="k">for</span> <span class="n">condition</span> <span class="ow">in</span> <span class="n">on</span><span class="o">.</span><span class="n">flatten</span><span class="p">():</span>
|
||||
</span><span id="join_condition-167"><a href="#join_condition-167"><span class="linenos">167</span></a> <span class="n">parts</span> <span class="o">=</span> <span class="p">[</span><span class="n">part</span> <span class="k">for</span> <span class="n">part</span> <span class="ow">in</span> <span class="n">condition</span><span class="o">.</span><span class="n">flatten</span><span class="p">()</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">part</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">EQ</span><span class="p">)]</span>
|
||||
</span><span id="join_condition-168"><a href="#join_condition-168"><span class="linenos">168</span></a> <span class="k">if</span> <span class="n">conditions</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
|
||||
</span><span id="join_condition-169"><a href="#join_condition-169"><span class="linenos">169</span></a> <span class="n">conditions</span> <span class="o">=</span> <span class="n">parts</span>
|
||||
</span><span id="join_condition-170"><a href="#join_condition-170"><span class="linenos">170</span></a> <span class="k">else</span><span class="p">:</span>
|
||||
</span><span id="join_condition-171"><a href="#join_condition-171"><span class="linenos">171</span></a> <span class="n">temp</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
</span><span id="join_condition-172"><a href="#join_condition-172"><span class="linenos">172</span></a> <span class="k">for</span> <span class="n">p</span> <span class="ow">in</span> <span class="n">parts</span><span class="p">:</span>
|
||||
</span><span id="join_condition-173"><a href="#join_condition-173"><span class="linenos">173</span></a> <span class="n">cs</span> <span class="o">=</span> <span class="p">[</span><span class="n">c</span> <span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="n">conditions</span> <span class="k">if</span> <span class="n">p</span> <span class="o">==</span> <span class="n">c</span><span class="p">]</span>
|
||||
</span><span id="join_condition-174"><a href="#join_condition-174"><span class="linenos">174</span></a>
|
||||
</span><span id="join_condition-175"><a href="#join_condition-175"><span class="linenos">175</span></a> <span class="k">if</span> <span class="n">cs</span><span class="p">:</span>
|
||||
</span><span id="join_condition-176"><a href="#join_condition-176"><span class="linenos">176</span></a> <span class="n">temp</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">p</span><span class="p">)</span>
|
||||
</span><span id="join_condition-177"><a href="#join_condition-177"><span class="linenos">177</span></a> <span class="n">temp</span><span class="o">.</span><span class="n">extend</span><span class="p">(</span><span class="n">cs</span><span class="p">)</span>
|
||||
</span><span id="join_condition-178"><a href="#join_condition-178"><span class="linenos">178</span></a> <span class="n">conditions</span> <span class="o">=</span> <span class="n">temp</span>
|
||||
</span><span id="join_condition-179"><a href="#join_condition-179"><span class="linenos">179</span></a>
|
||||
</span><span id="join_condition-180"><a href="#join_condition-180"><span class="linenos">180</span></a> <span class="k">for</span> <span class="n">condition</span> <span class="ow">in</span> <span class="n">conditions</span><span class="p">:</span>
|
||||
</span><span id="join_condition-181"><a href="#join_condition-181"><span class="linenos">181</span></a> <span class="n">extract_condition</span><span class="p">(</span><span class="n">condition</span><span class="p">)</span>
|
||||
</span><span id="join_condition-182"><a href="#join_condition-182"><span class="linenos">182</span></a>
|
||||
</span><span id="join_condition-183"><a href="#join_condition-183"><span class="linenos">183</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">simplify</span><span class="p">(</span><span class="n">on</span><span class="p">)</span>
|
||||
</span><span id="join_condition-184"><a href="#join_condition-184"><span class="linenos">184</span></a> <span class="n">remaining_condition</span> <span class="o">=</span> <span class="kc">None</span> <span class="k">if</span> <span class="n">on</span> <span class="o">==</span> <span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">()</span> <span class="k">else</span> <span class="n">on</span>
|
||||
</span><span id="join_condition-185"><a href="#join_condition-185"><span class="linenos">185</span></a> <span class="k">return</span> <span class="n">source_key</span><span class="p">,</span> <span class="n">join_key</span><span class="p">,</span> <span class="n">remaining_condition</span>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="join_condition-120"><a href="#join_condition-120"><span class="linenos">120</span></a><span class="k">def</span> <span class="nf">join_condition</span><span class="p">(</span><span class="n">join</span><span class="p">):</span>
|
||||
</span><span id="join_condition-121"><a href="#join_condition-121"><span class="linenos">121</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="join_condition-122"><a href="#join_condition-122"><span class="linenos">122</span></a><span class="sd"> Extract the join condition from a join expression.</span>
|
||||
</span><span id="join_condition-123"><a href="#join_condition-123"><span class="linenos">123</span></a>
|
||||
</span><span id="join_condition-124"><a href="#join_condition-124"><span class="linenos">124</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="join_condition-125"><a href="#join_condition-125"><span class="linenos">125</span></a><span class="sd"> join (exp.Join)</span>
|
||||
</span><span id="join_condition-126"><a href="#join_condition-126"><span class="linenos">126</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="join_condition-127"><a href="#join_condition-127"><span class="linenos">127</span></a><span class="sd"> tuple[list[str], list[str], exp.Expression]:</span>
|
||||
</span><span id="join_condition-128"><a href="#join_condition-128"><span class="linenos">128</span></a><span class="sd"> Tuple of (source key, join key, remaining predicate)</span>
|
||||
</span><span id="join_condition-129"><a href="#join_condition-129"><span class="linenos">129</span></a><span class="sd"> """</span>
|
||||
</span><span id="join_condition-130"><a href="#join_condition-130"><span class="linenos">130</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="join_condition-131"><a href="#join_condition-131"><span class="linenos">131</span></a> <span class="n">on</span> <span class="o">=</span> <span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)</span> <span class="ow">or</span> <span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span>
|
||||
</span><span id="join_condition-132"><a href="#join_condition-132"><span class="linenos">132</span></a> <span class="n">source_key</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
</span><span id="join_condition-133"><a href="#join_condition-133"><span class="linenos">133</span></a> <span class="n">join_key</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
</span><span id="join_condition-134"><a href="#join_condition-134"><span class="linenos">134</span></a>
|
||||
</span><span id="join_condition-135"><a href="#join_condition-135"><span class="linenos">135</span></a> <span class="k">def</span> <span class="nf">extract_condition</span><span class="p">(</span><span class="n">condition</span><span class="p">):</span>
|
||||
</span><span id="join_condition-136"><a href="#join_condition-136"><span class="linenos">136</span></a> <span class="n">left</span><span class="p">,</span> <span class="n">right</span> <span class="o">=</span> <span class="n">condition</span><span class="o">.</span><span class="n">unnest_operands</span><span class="p">()</span>
|
||||
</span><span id="join_condition-137"><a href="#join_condition-137"><span class="linenos">137</span></a> <span class="n">left_tables</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">left</span><span class="p">)</span>
|
||||
</span><span id="join_condition-138"><a href="#join_condition-138"><span class="linenos">138</span></a> <span class="n">right_tables</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">right</span><span class="p">)</span>
|
||||
</span><span id="join_condition-139"><a href="#join_condition-139"><span class="linenos">139</span></a>
|
||||
</span><span id="join_condition-140"><a href="#join_condition-140"><span class="linenos">140</span></a> <span class="k">if</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">left_tables</span> <span class="ow">and</span> <span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">right_tables</span><span class="p">:</span>
|
||||
</span><span id="join_condition-141"><a href="#join_condition-141"><span class="linenos">141</span></a> <span class="n">join_key</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">left</span><span class="p">)</span>
|
||||
</span><span id="join_condition-142"><a href="#join_condition-142"><span class="linenos">142</span></a> <span class="n">source_key</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">right</span><span class="p">)</span>
|
||||
</span><span id="join_condition-143"><a href="#join_condition-143"><span class="linenos">143</span></a> <span class="n">condition</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
|
||||
</span><span id="join_condition-144"><a href="#join_condition-144"><span class="linenos">144</span></a> <span class="k">elif</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">right_tables</span> <span class="ow">and</span> <span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">left_tables</span><span class="p">:</span>
|
||||
</span><span id="join_condition-145"><a href="#join_condition-145"><span class="linenos">145</span></a> <span class="n">join_key</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">right</span><span class="p">)</span>
|
||||
</span><span id="join_condition-146"><a href="#join_condition-146"><span class="linenos">146</span></a> <span class="n">source_key</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">left</span><span class="p">)</span>
|
||||
</span><span id="join_condition-147"><a href="#join_condition-147"><span class="linenos">147</span></a> <span class="n">condition</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
|
||||
</span><span id="join_condition-148"><a href="#join_condition-148"><span class="linenos">148</span></a>
|
||||
</span><span id="join_condition-149"><a href="#join_condition-149"><span class="linenos">149</span></a> <span class="c1"># find the join keys</span>
|
||||
</span><span id="join_condition-150"><a href="#join_condition-150"><span class="linenos">150</span></a> <span class="c1"># SELECT</span>
|
||||
</span><span id="join_condition-151"><a href="#join_condition-151"><span class="linenos">151</span></a> <span class="c1"># FROM x</span>
|
||||
</span><span id="join_condition-152"><a href="#join_condition-152"><span class="linenos">152</span></a> <span class="c1"># JOIN y</span>
|
||||
</span><span id="join_condition-153"><a href="#join_condition-153"><span class="linenos">153</span></a> <span class="c1"># ON x.a = y.b AND y.b > 1</span>
|
||||
</span><span id="join_condition-154"><a href="#join_condition-154"><span class="linenos">154</span></a> <span class="c1">#</span>
|
||||
</span><span id="join_condition-155"><a href="#join_condition-155"><span class="linenos">155</span></a> <span class="c1"># should pull y.b as the join key and x.a as the source key</span>
|
||||
</span><span id="join_condition-156"><a href="#join_condition-156"><span class="linenos">156</span></a> <span class="k">if</span> <span class="n">normalized</span><span class="p">(</span><span class="n">on</span><span class="p">):</span>
|
||||
</span><span id="join_condition-157"><a href="#join_condition-157"><span class="linenos">157</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">on</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span><span class="p">)</span> <span class="k">else</span> <span class="n">exp</span><span class="o">.</span><span class="n">and_</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
|
||||
</span><span id="join_condition-158"><a href="#join_condition-158"><span class="linenos">158</span></a>
|
||||
</span><span id="join_condition-159"><a href="#join_condition-159"><span class="linenos">159</span></a> <span class="k">for</span> <span class="n">condition</span> <span class="ow">in</span> <span class="n">on</span><span class="o">.</span><span class="n">flatten</span><span class="p">():</span>
|
||||
</span><span id="join_condition-160"><a href="#join_condition-160"><span class="linenos">160</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">condition</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">EQ</span><span class="p">):</span>
|
||||
</span><span id="join_condition-161"><a href="#join_condition-161"><span class="linenos">161</span></a> <span class="n">extract_condition</span><span class="p">(</span><span class="n">condition</span><span class="p">)</span>
|
||||
</span><span id="join_condition-162"><a href="#join_condition-162"><span class="linenos">162</span></a> <span class="k">elif</span> <span class="n">normalized</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
|
||||
</span><span id="join_condition-163"><a href="#join_condition-163"><span class="linenos">163</span></a> <span class="n">conditions</span> <span class="o">=</span> <span class="kc">None</span>
|
||||
</span><span id="join_condition-164"><a href="#join_condition-164"><span class="linenos">164</span></a>
|
||||
</span><span id="join_condition-165"><a href="#join_condition-165"><span class="linenos">165</span></a> <span class="k">for</span> <span class="n">condition</span> <span class="ow">in</span> <span class="n">on</span><span class="o">.</span><span class="n">flatten</span><span class="p">():</span>
|
||||
</span><span id="join_condition-166"><a href="#join_condition-166"><span class="linenos">166</span></a> <span class="n">parts</span> <span class="o">=</span> <span class="p">[</span><span class="n">part</span> <span class="k">for</span> <span class="n">part</span> <span class="ow">in</span> <span class="n">condition</span><span class="o">.</span><span class="n">flatten</span><span class="p">()</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">part</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">EQ</span><span class="p">)]</span>
|
||||
</span><span id="join_condition-167"><a href="#join_condition-167"><span class="linenos">167</span></a> <span class="k">if</span> <span class="n">conditions</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
|
||||
</span><span id="join_condition-168"><a href="#join_condition-168"><span class="linenos">168</span></a> <span class="n">conditions</span> <span class="o">=</span> <span class="n">parts</span>
|
||||
</span><span id="join_condition-169"><a href="#join_condition-169"><span class="linenos">169</span></a> <span class="k">else</span><span class="p">:</span>
|
||||
</span><span id="join_condition-170"><a href="#join_condition-170"><span class="linenos">170</span></a> <span class="n">temp</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
</span><span id="join_condition-171"><a href="#join_condition-171"><span class="linenos">171</span></a> <span class="k">for</span> <span class="n">p</span> <span class="ow">in</span> <span class="n">parts</span><span class="p">:</span>
|
||||
</span><span id="join_condition-172"><a href="#join_condition-172"><span class="linenos">172</span></a> <span class="n">cs</span> <span class="o">=</span> <span class="p">[</span><span class="n">c</span> <span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="n">conditions</span> <span class="k">if</span> <span class="n">p</span> <span class="o">==</span> <span class="n">c</span><span class="p">]</span>
|
||||
</span><span id="join_condition-173"><a href="#join_condition-173"><span class="linenos">173</span></a>
|
||||
</span><span id="join_condition-174"><a href="#join_condition-174"><span class="linenos">174</span></a> <span class="k">if</span> <span class="n">cs</span><span class="p">:</span>
|
||||
</span><span id="join_condition-175"><a href="#join_condition-175"><span class="linenos">175</span></a> <span class="n">temp</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">p</span><span class="p">)</span>
|
||||
</span><span id="join_condition-176"><a href="#join_condition-176"><span class="linenos">176</span></a> <span class="n">temp</span><span class="o">.</span><span class="n">extend</span><span class="p">(</span><span class="n">cs</span><span class="p">)</span>
|
||||
</span><span id="join_condition-177"><a href="#join_condition-177"><span class="linenos">177</span></a> <span class="n">conditions</span> <span class="o">=</span> <span class="n">temp</span>
|
||||
</span><span id="join_condition-178"><a href="#join_condition-178"><span class="linenos">178</span></a>
|
||||
</span><span id="join_condition-179"><a href="#join_condition-179"><span class="linenos">179</span></a> <span class="k">for</span> <span class="n">condition</span> <span class="ow">in</span> <span class="n">conditions</span><span class="p">:</span>
|
||||
</span><span id="join_condition-180"><a href="#join_condition-180"><span class="linenos">180</span></a> <span class="n">extract_condition</span><span class="p">(</span><span class="n">condition</span><span class="p">)</span>
|
||||
</span><span id="join_condition-181"><a href="#join_condition-181"><span class="linenos">181</span></a>
|
||||
</span><span id="join_condition-182"><a href="#join_condition-182"><span class="linenos">182</span></a> <span class="k">return</span> <span class="n">source_key</span><span class="p">,</span> <span class="n">join_key</span><span class="p">,</span> <span class="n">on</span>
|
||||
</span></pre></div>
|
||||
|
||||
|
||||
|
|
|
|||
|
|
@ -3,7 +3,7 @@
|
|||
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|
||||
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<title>sqlglot.optimizer.eliminate_subqueries API documentation</title>
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||||
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|
||||
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|
@ -28,8 +28,8 @@
|
|||
|
||||
|
||||
|
||||
<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
||||
<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
||||
<li>
|
||||
<a class="function" href="#eliminate_subqueries">eliminate_subqueries</a>
|
||||
</li>
|
||||
|
|
@ -61,194 +61,192 @@
|
|||
</span><span id="L-3"><a href="#L-3"><span class="linenos"> 3</span></a><span class="kn">from</span> <span class="nn">sqlglot</span> <span class="kn">import</span> <span class="n">expressions</span> <span class="k">as</span> <span class="n">exp</span>
|
||||
</span><span id="L-4"><a href="#L-4"><span class="linenos"> 4</span></a><span class="kn">from</span> <span class="nn">sqlglot.helper</span> <span class="kn">import</span> <span class="n">find_new_name</span>
|
||||
</span><span id="L-5"><a href="#L-5"><span class="linenos"> 5</span></a><span class="kn">from</span> <span class="nn">sqlglot.optimizer.scope</span> <span class="kn">import</span> <span class="n">build_scope</span>
|
||||
</span><span id="L-6"><a href="#L-6"><span class="linenos"> 6</span></a><span class="kn">from</span> <span class="nn">sqlglot.optimizer.simplify</span> <span class="kn">import</span> <span class="n">simplify</span>
|
||||
</span><span id="L-6"><a href="#L-6"><span class="linenos"> 6</span></a>
|
||||
</span><span id="L-7"><a href="#L-7"><span class="linenos"> 7</span></a>
|
||||
</span><span id="L-8"><a href="#L-8"><span class="linenos"> 8</span></a>
|
||||
</span><span id="L-9"><a href="#L-9"><span class="linenos"> 9</span></a><span class="k">def</span> <span class="nf">eliminate_subqueries</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="L-10"><a href="#L-10"><span class="linenos"> 10</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-11"><a href="#L-11"><span class="linenos"> 11</span></a><span class="sd"> Rewrite derived tables as CTES, deduplicating if possible.</span>
|
||||
</span><span id="L-12"><a href="#L-12"><span class="linenos"> 12</span></a>
|
||||
</span><span id="L-13"><a href="#L-13"><span class="linenos"> 13</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="L-14"><a href="#L-14"><span class="linenos"> 14</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="L-15"><a href="#L-15"><span class="linenos"> 15</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT a FROM (SELECT * FROM x) AS y")</span>
|
||||
</span><span id="L-16"><a href="#L-16"><span class="linenos"> 16</span></a><span class="sd"> >>> eliminate_subqueries(expression).sql()</span>
|
||||
</span><span id="L-17"><a href="#L-17"><span class="linenos"> 17</span></a><span class="sd"> 'WITH y AS (SELECT * FROM x) SELECT a FROM y AS y'</span>
|
||||
</span><span id="L-18"><a href="#L-18"><span class="linenos"> 18</span></a>
|
||||
</span><span id="L-19"><a href="#L-19"><span class="linenos"> 19</span></a><span class="sd"> This also deduplicates common subqueries:</span>
|
||||
</span><span id="L-20"><a href="#L-20"><span class="linenos"> 20</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT a FROM (SELECT * FROM x) AS y JOIN (SELECT * FROM x) AS z")</span>
|
||||
</span><span id="L-21"><a href="#L-21"><span class="linenos"> 21</span></a><span class="sd"> >>> eliminate_subqueries(expression).sql()</span>
|
||||
</span><span id="L-22"><a href="#L-22"><span class="linenos"> 22</span></a><span class="sd"> 'WITH y AS (SELECT * FROM x) SELECT a FROM y AS y JOIN y AS z'</span>
|
||||
</span><span id="L-23"><a href="#L-23"><span class="linenos"> 23</span></a>
|
||||
</span><span id="L-24"><a href="#L-24"><span class="linenos"> 24</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-25"><a href="#L-25"><span class="linenos"> 25</span></a><span class="sd"> expression (sqlglot.Expression): expression</span>
|
||||
</span><span id="L-26"><a href="#L-26"><span class="linenos"> 26</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="L-27"><a href="#L-27"><span class="linenos"> 27</span></a><span class="sd"> sqlglot.Expression: expression</span>
|
||||
</span><span id="L-28"><a href="#L-28"><span class="linenos"> 28</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-29"><a href="#L-29"><span class="linenos"> 29</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Subquery</span><span class="p">):</span>
|
||||
</span><span id="L-30"><a href="#L-30"><span class="linenos"> 30</span></a> <span class="c1"># It's possible to have subqueries at the root, e.g. (SELECT * FROM x) LIMIT 1</span>
|
||||
</span><span id="L-31"><a href="#L-31"><span class="linenos"> 31</span></a> <span class="n">eliminate_subqueries</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">this</span><span class="p">)</span>
|
||||
</span><span id="L-32"><a href="#L-32"><span class="linenos"> 32</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-33"><a href="#L-33"><span class="linenos"> 33</span></a>
|
||||
</span><span id="L-34"><a href="#L-34"><span class="linenos"> 34</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">simplify</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="L-35"><a href="#L-35"><span class="linenos"> 35</span></a> <span class="n">root</span> <span class="o">=</span> <span class="n">build_scope</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="L-36"><a href="#L-36"><span class="linenos"> 36</span></a>
|
||||
</span><span id="L-37"><a href="#L-37"><span class="linenos"> 37</span></a> <span class="c1"># Map of alias->Scope|Table</span>
|
||||
</span><span id="L-38"><a href="#L-38"><span class="linenos"> 38</span></a> <span class="c1"># These are all aliases that are already used in the expression.</span>
|
||||
</span><span id="L-39"><a href="#L-39"><span class="linenos"> 39</span></a> <span class="c1"># We don't want to create new CTEs that conflict with these names.</span>
|
||||
</span><span id="L-40"><a href="#L-40"><span class="linenos"> 40</span></a> <span class="n">taken</span> <span class="o">=</span> <span class="p">{}</span>
|
||||
</span><span id="L-41"><a href="#L-41"><span class="linenos"> 41</span></a>
|
||||
</span><span id="L-42"><a href="#L-42"><span class="linenos"> 42</span></a> <span class="c1"># All CTE aliases in the root scope are taken</span>
|
||||
</span><span id="L-43"><a href="#L-43"><span class="linenos"> 43</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">root</span><span class="o">.</span><span class="n">cte_scopes</span><span class="p">:</span>
|
||||
</span><span id="L-44"><a href="#L-44"><span class="linenos"> 44</span></a> <span class="n">taken</span><span class="p">[</span><span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">parent</span><span class="o">.</span><span class="n">alias</span><span class="p">]</span> <span class="o">=</span> <span class="n">scope</span>
|
||||
</span><span id="L-45"><a href="#L-45"><span class="linenos"> 45</span></a>
|
||||
</span><span id="L-46"><a href="#L-46"><span class="linenos"> 46</span></a> <span class="c1"># All table names are taken</span>
|
||||
</span><span id="L-47"><a href="#L-47"><span class="linenos"> 47</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">root</span><span class="o">.</span><span class="n">traverse</span><span class="p">():</span>
|
||||
</span><span id="L-48"><a href="#L-48"><span class="linenos"> 48</span></a> <span class="n">taken</span><span class="o">.</span><span class="n">update</span><span class="p">(</span>
|
||||
</span><span id="L-49"><a href="#L-49"><span class="linenos"> 49</span></a> <span class="p">{</span>
|
||||
</span><span id="L-50"><a href="#L-50"><span class="linenos"> 50</span></a> <span class="n">source</span><span class="o">.</span><span class="n">name</span><span class="p">:</span> <span class="n">source</span>
|
||||
</span><span id="L-51"><a href="#L-51"><span class="linenos"> 51</span></a> <span class="k">for</span> <span class="n">_</span><span class="p">,</span> <span class="n">source</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">sources</span><span class="o">.</span><span class="n">items</span><span class="p">()</span>
|
||||
</span><span id="L-52"><a href="#L-52"><span class="linenos"> 52</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Table</span><span class="p">)</span>
|
||||
</span><span id="L-53"><a href="#L-53"><span class="linenos"> 53</span></a> <span class="p">}</span>
|
||||
</span><span id="L-54"><a href="#L-54"><span class="linenos"> 54</span></a> <span class="p">)</span>
|
||||
</span><span id="L-55"><a href="#L-55"><span class="linenos"> 55</span></a>
|
||||
</span><span id="L-56"><a href="#L-56"><span class="linenos"> 56</span></a> <span class="c1"># Map of Expression->alias</span>
|
||||
</span><span id="L-57"><a href="#L-57"><span class="linenos"> 57</span></a> <span class="c1"># Existing CTES in the root expression. We'll use this for deduplication.</span>
|
||||
</span><span id="L-58"><a href="#L-58"><span class="linenos"> 58</span></a> <span class="n">existing_ctes</span> <span class="o">=</span> <span class="p">{}</span>
|
||||
</span><span id="L-59"><a href="#L-59"><span class="linenos"> 59</span></a>
|
||||
</span><span id="L-60"><a href="#L-60"><span class="linenos"> 60</span></a> <span class="n">with_</span> <span class="o">=</span> <span class="n">root</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"with"</span><span class="p">)</span>
|
||||
</span><span id="L-61"><a href="#L-61"><span class="linenos"> 61</span></a> <span class="n">recursive</span> <span class="o">=</span> <span class="kc">False</span>
|
||||
</span><span id="L-62"><a href="#L-62"><span class="linenos"> 62</span></a> <span class="k">if</span> <span class="n">with_</span><span class="p">:</span>
|
||||
</span><span id="L-63"><a href="#L-63"><span class="linenos"> 63</span></a> <span class="n">recursive</span> <span class="o">=</span> <span class="n">with_</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"recursive"</span><span class="p">)</span>
|
||||
</span><span id="L-64"><a href="#L-64"><span class="linenos"> 64</span></a> <span class="k">for</span> <span class="n">cte</span> <span class="ow">in</span> <span class="n">with_</span><span class="o">.</span><span class="n">expressions</span><span class="p">:</span>
|
||||
</span><span id="L-65"><a href="#L-65"><span class="linenos"> 65</span></a> <span class="n">existing_ctes</span><span class="p">[</span><span class="n">cte</span><span class="o">.</span><span class="n">this</span><span class="p">]</span> <span class="o">=</span> <span class="n">cte</span><span class="o">.</span><span class="n">alias</span>
|
||||
</span><span id="L-66"><a href="#L-66"><span class="linenos"> 66</span></a> <span class="n">new_ctes</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
</span><span id="L-67"><a href="#L-67"><span class="linenos"> 67</span></a>
|
||||
</span><span id="L-68"><a href="#L-68"><span class="linenos"> 68</span></a> <span class="c1"># We're adding more CTEs, but we want to maintain the DAG order.</span>
|
||||
</span><span id="L-69"><a href="#L-69"><span class="linenos"> 69</span></a> <span class="c1"># Derived tables within an existing CTE need to come before the existing CTE.</span>
|
||||
</span><span id="L-70"><a href="#L-70"><span class="linenos"> 70</span></a> <span class="k">for</span> <span class="n">cte_scope</span> <span class="ow">in</span> <span class="n">root</span><span class="o">.</span><span class="n">cte_scopes</span><span class="p">:</span>
|
||||
</span><span id="L-71"><a href="#L-71"><span class="linenos"> 71</span></a> <span class="c1"># Append all the new CTEs from this existing CTE</span>
|
||||
</span><span id="L-72"><a href="#L-72"><span class="linenos"> 72</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">cte_scope</span><span class="o">.</span><span class="n">traverse</span><span class="p">():</span>
|
||||
</span><span id="L-73"><a href="#L-73"><span class="linenos"> 73</span></a> <span class="k">if</span> <span class="n">scope</span> <span class="ow">is</span> <span class="n">cte_scope</span><span class="p">:</span>
|
||||
</span><span id="L-74"><a href="#L-74"><span class="linenos"> 74</span></a> <span class="c1"># Don't try to eliminate this CTE itself</span>
|
||||
</span><span id="L-75"><a href="#L-75"><span class="linenos"> 75</span></a> <span class="k">continue</span>
|
||||
</span><span id="L-76"><a href="#L-76"><span class="linenos"> 76</span></a> <span class="n">new_cte</span> <span class="o">=</span> <span class="n">_eliminate</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">)</span>
|
||||
</span><span id="L-77"><a href="#L-77"><span class="linenos"> 77</span></a> <span class="k">if</span> <span class="n">new_cte</span><span class="p">:</span>
|
||||
</span><span id="L-78"><a href="#L-78"><span class="linenos"> 78</span></a> <span class="n">new_ctes</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">new_cte</span><span class="p">)</span>
|
||||
</span><span id="L-79"><a href="#L-79"><span class="linenos"> 79</span></a>
|
||||
</span><span id="L-80"><a href="#L-80"><span class="linenos"> 80</span></a> <span class="c1"># Append the existing CTE itself</span>
|
||||
</span><span id="L-81"><a href="#L-81"><span class="linenos"> 81</span></a> <span class="n">new_ctes</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">cte_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">parent</span><span class="p">)</span>
|
||||
</span><span id="L-82"><a href="#L-82"><span class="linenos"> 82</span></a>
|
||||
</span><span id="L-83"><a href="#L-83"><span class="linenos"> 83</span></a> <span class="c1"># Now append the rest</span>
|
||||
</span><span id="L-84"><a href="#L-84"><span class="linenos"> 84</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">itertools</span><span class="o">.</span><span class="n">chain</span><span class="p">(</span><span class="n">root</span><span class="o">.</span><span class="n">union_scopes</span><span class="p">,</span> <span class="n">root</span><span class="o">.</span><span class="n">subquery_scopes</span><span class="p">,</span> <span class="n">root</span><span class="o">.</span><span class="n">table_scopes</span><span class="p">):</span>
|
||||
</span><span id="L-85"><a href="#L-85"><span class="linenos"> 85</span></a> <span class="k">for</span> <span class="n">child_scope</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">traverse</span><span class="p">():</span>
|
||||
</span><span id="L-86"><a href="#L-86"><span class="linenos"> 86</span></a> <span class="n">new_cte</span> <span class="o">=</span> <span class="n">_eliminate</span><span class="p">(</span><span class="n">child_scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">)</span>
|
||||
</span><span id="L-87"><a href="#L-87"><span class="linenos"> 87</span></a> <span class="k">if</span> <span class="n">new_cte</span><span class="p">:</span>
|
||||
</span><span id="L-88"><a href="#L-88"><span class="linenos"> 88</span></a> <span class="n">new_ctes</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">new_cte</span><span class="p">)</span>
|
||||
</span><span id="L-89"><a href="#L-89"><span class="linenos"> 89</span></a>
|
||||
</span><span id="L-90"><a href="#L-90"><span class="linenos"> 90</span></a> <span class="k">if</span> <span class="n">new_ctes</span><span class="p">:</span>
|
||||
</span><span id="L-91"><a href="#L-91"><span class="linenos"> 91</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"with"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">With</span><span class="p">(</span><span class="n">expressions</span><span class="o">=</span><span class="n">new_ctes</span><span class="p">,</span> <span class="n">recursive</span><span class="o">=</span><span class="n">recursive</span><span class="p">))</span>
|
||||
</span><span id="L-8"><a href="#L-8"><span class="linenos"> 8</span></a><span class="k">def</span> <span class="nf">eliminate_subqueries</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="L-9"><a href="#L-9"><span class="linenos"> 9</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-10"><a href="#L-10"><span class="linenos"> 10</span></a><span class="sd"> Rewrite derived tables as CTES, deduplicating if possible.</span>
|
||||
</span><span id="L-11"><a href="#L-11"><span class="linenos"> 11</span></a>
|
||||
</span><span id="L-12"><a href="#L-12"><span class="linenos"> 12</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="L-13"><a href="#L-13"><span class="linenos"> 13</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="L-14"><a href="#L-14"><span class="linenos"> 14</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT a FROM (SELECT * FROM x) AS y")</span>
|
||||
</span><span id="L-15"><a href="#L-15"><span class="linenos"> 15</span></a><span class="sd"> >>> eliminate_subqueries(expression).sql()</span>
|
||||
</span><span id="L-16"><a href="#L-16"><span class="linenos"> 16</span></a><span class="sd"> 'WITH y AS (SELECT * FROM x) SELECT a FROM y AS y'</span>
|
||||
</span><span id="L-17"><a href="#L-17"><span class="linenos"> 17</span></a>
|
||||
</span><span id="L-18"><a href="#L-18"><span class="linenos"> 18</span></a><span class="sd"> This also deduplicates common subqueries:</span>
|
||||
</span><span id="L-19"><a href="#L-19"><span class="linenos"> 19</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT a FROM (SELECT * FROM x) AS y JOIN (SELECT * FROM x) AS z")</span>
|
||||
</span><span id="L-20"><a href="#L-20"><span class="linenos"> 20</span></a><span class="sd"> >>> eliminate_subqueries(expression).sql()</span>
|
||||
</span><span id="L-21"><a href="#L-21"><span class="linenos"> 21</span></a><span class="sd"> 'WITH y AS (SELECT * FROM x) SELECT a FROM y AS y JOIN y AS z'</span>
|
||||
</span><span id="L-22"><a href="#L-22"><span class="linenos"> 22</span></a>
|
||||
</span><span id="L-23"><a href="#L-23"><span class="linenos"> 23</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-24"><a href="#L-24"><span class="linenos"> 24</span></a><span class="sd"> expression (sqlglot.Expression): expression</span>
|
||||
</span><span id="L-25"><a href="#L-25"><span class="linenos"> 25</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="L-26"><a href="#L-26"><span class="linenos"> 26</span></a><span class="sd"> sqlglot.Expression: expression</span>
|
||||
</span><span id="L-27"><a href="#L-27"><span class="linenos"> 27</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-28"><a href="#L-28"><span class="linenos"> 28</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Subquery</span><span class="p">):</span>
|
||||
</span><span id="L-29"><a href="#L-29"><span class="linenos"> 29</span></a> <span class="c1"># It's possible to have subqueries at the root, e.g. (SELECT * FROM x) LIMIT 1</span>
|
||||
</span><span id="L-30"><a href="#L-30"><span class="linenos"> 30</span></a> <span class="n">eliminate_subqueries</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">this</span><span class="p">)</span>
|
||||
</span><span id="L-31"><a href="#L-31"><span class="linenos"> 31</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-32"><a href="#L-32"><span class="linenos"> 32</span></a>
|
||||
</span><span id="L-33"><a href="#L-33"><span class="linenos"> 33</span></a> <span class="n">root</span> <span class="o">=</span> <span class="n">build_scope</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="L-34"><a href="#L-34"><span class="linenos"> 34</span></a>
|
||||
</span><span id="L-35"><a href="#L-35"><span class="linenos"> 35</span></a> <span class="c1"># Map of alias->Scope|Table</span>
|
||||
</span><span id="L-36"><a href="#L-36"><span class="linenos"> 36</span></a> <span class="c1"># These are all aliases that are already used in the expression.</span>
|
||||
</span><span id="L-37"><a href="#L-37"><span class="linenos"> 37</span></a> <span class="c1"># We don't want to create new CTEs that conflict with these names.</span>
|
||||
</span><span id="L-38"><a href="#L-38"><span class="linenos"> 38</span></a> <span class="n">taken</span> <span class="o">=</span> <span class="p">{}</span>
|
||||
</span><span id="L-39"><a href="#L-39"><span class="linenos"> 39</span></a>
|
||||
</span><span id="L-40"><a href="#L-40"><span class="linenos"> 40</span></a> <span class="c1"># All CTE aliases in the root scope are taken</span>
|
||||
</span><span id="L-41"><a href="#L-41"><span class="linenos"> 41</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">root</span><span class="o">.</span><span class="n">cte_scopes</span><span class="p">:</span>
|
||||
</span><span id="L-42"><a href="#L-42"><span class="linenos"> 42</span></a> <span class="n">taken</span><span class="p">[</span><span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">parent</span><span class="o">.</span><span class="n">alias</span><span class="p">]</span> <span class="o">=</span> <span class="n">scope</span>
|
||||
</span><span id="L-43"><a href="#L-43"><span class="linenos"> 43</span></a>
|
||||
</span><span id="L-44"><a href="#L-44"><span class="linenos"> 44</span></a> <span class="c1"># All table names are taken</span>
|
||||
</span><span id="L-45"><a href="#L-45"><span class="linenos"> 45</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">root</span><span class="o">.</span><span class="n">traverse</span><span class="p">():</span>
|
||||
</span><span id="L-46"><a href="#L-46"><span class="linenos"> 46</span></a> <span class="n">taken</span><span class="o">.</span><span class="n">update</span><span class="p">(</span>
|
||||
</span><span id="L-47"><a href="#L-47"><span class="linenos"> 47</span></a> <span class="p">{</span>
|
||||
</span><span id="L-48"><a href="#L-48"><span class="linenos"> 48</span></a> <span class="n">source</span><span class="o">.</span><span class="n">name</span><span class="p">:</span> <span class="n">source</span>
|
||||
</span><span id="L-49"><a href="#L-49"><span class="linenos"> 49</span></a> <span class="k">for</span> <span class="n">_</span><span class="p">,</span> <span class="n">source</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">sources</span><span class="o">.</span><span class="n">items</span><span class="p">()</span>
|
||||
</span><span id="L-50"><a href="#L-50"><span class="linenos"> 50</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Table</span><span class="p">)</span>
|
||||
</span><span id="L-51"><a href="#L-51"><span class="linenos"> 51</span></a> <span class="p">}</span>
|
||||
</span><span id="L-52"><a href="#L-52"><span class="linenos"> 52</span></a> <span class="p">)</span>
|
||||
</span><span id="L-53"><a href="#L-53"><span class="linenos"> 53</span></a>
|
||||
</span><span id="L-54"><a href="#L-54"><span class="linenos"> 54</span></a> <span class="c1"># Map of Expression->alias</span>
|
||||
</span><span id="L-55"><a href="#L-55"><span class="linenos"> 55</span></a> <span class="c1"># Existing CTES in the root expression. We'll use this for deduplication.</span>
|
||||
</span><span id="L-56"><a href="#L-56"><span class="linenos"> 56</span></a> <span class="n">existing_ctes</span> <span class="o">=</span> <span class="p">{}</span>
|
||||
</span><span id="L-57"><a href="#L-57"><span class="linenos"> 57</span></a>
|
||||
</span><span id="L-58"><a href="#L-58"><span class="linenos"> 58</span></a> <span class="n">with_</span> <span class="o">=</span> <span class="n">root</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"with"</span><span class="p">)</span>
|
||||
</span><span id="L-59"><a href="#L-59"><span class="linenos"> 59</span></a> <span class="n">recursive</span> <span class="o">=</span> <span class="kc">False</span>
|
||||
</span><span id="L-60"><a href="#L-60"><span class="linenos"> 60</span></a> <span class="k">if</span> <span class="n">with_</span><span class="p">:</span>
|
||||
</span><span id="L-61"><a href="#L-61"><span class="linenos"> 61</span></a> <span class="n">recursive</span> <span class="o">=</span> <span class="n">with_</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"recursive"</span><span class="p">)</span>
|
||||
</span><span id="L-62"><a href="#L-62"><span class="linenos"> 62</span></a> <span class="k">for</span> <span class="n">cte</span> <span class="ow">in</span> <span class="n">with_</span><span class="o">.</span><span class="n">expressions</span><span class="p">:</span>
|
||||
</span><span id="L-63"><a href="#L-63"><span class="linenos"> 63</span></a> <span class="n">existing_ctes</span><span class="p">[</span><span class="n">cte</span><span class="o">.</span><span class="n">this</span><span class="p">]</span> <span class="o">=</span> <span class="n">cte</span><span class="o">.</span><span class="n">alias</span>
|
||||
</span><span id="L-64"><a href="#L-64"><span class="linenos"> 64</span></a> <span class="n">new_ctes</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
</span><span id="L-65"><a href="#L-65"><span class="linenos"> 65</span></a>
|
||||
</span><span id="L-66"><a href="#L-66"><span class="linenos"> 66</span></a> <span class="c1"># We're adding more CTEs, but we want to maintain the DAG order.</span>
|
||||
</span><span id="L-67"><a href="#L-67"><span class="linenos"> 67</span></a> <span class="c1"># Derived tables within an existing CTE need to come before the existing CTE.</span>
|
||||
</span><span id="L-68"><a href="#L-68"><span class="linenos"> 68</span></a> <span class="k">for</span> <span class="n">cte_scope</span> <span class="ow">in</span> <span class="n">root</span><span class="o">.</span><span class="n">cte_scopes</span><span class="p">:</span>
|
||||
</span><span id="L-69"><a href="#L-69"><span class="linenos"> 69</span></a> <span class="c1"># Append all the new CTEs from this existing CTE</span>
|
||||
</span><span id="L-70"><a href="#L-70"><span class="linenos"> 70</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">cte_scope</span><span class="o">.</span><span class="n">traverse</span><span class="p">():</span>
|
||||
</span><span id="L-71"><a href="#L-71"><span class="linenos"> 71</span></a> <span class="k">if</span> <span class="n">scope</span> <span class="ow">is</span> <span class="n">cte_scope</span><span class="p">:</span>
|
||||
</span><span id="L-72"><a href="#L-72"><span class="linenos"> 72</span></a> <span class="c1"># Don't try to eliminate this CTE itself</span>
|
||||
</span><span id="L-73"><a href="#L-73"><span class="linenos"> 73</span></a> <span class="k">continue</span>
|
||||
</span><span id="L-74"><a href="#L-74"><span class="linenos"> 74</span></a> <span class="n">new_cte</span> <span class="o">=</span> <span class="n">_eliminate</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">)</span>
|
||||
</span><span id="L-75"><a href="#L-75"><span class="linenos"> 75</span></a> <span class="k">if</span> <span class="n">new_cte</span><span class="p">:</span>
|
||||
</span><span id="L-76"><a href="#L-76"><span class="linenos"> 76</span></a> <span class="n">new_ctes</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">new_cte</span><span class="p">)</span>
|
||||
</span><span id="L-77"><a href="#L-77"><span class="linenos"> 77</span></a>
|
||||
</span><span id="L-78"><a href="#L-78"><span class="linenos"> 78</span></a> <span class="c1"># Append the existing CTE itself</span>
|
||||
</span><span id="L-79"><a href="#L-79"><span class="linenos"> 79</span></a> <span class="n">new_ctes</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">cte_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">parent</span><span class="p">)</span>
|
||||
</span><span id="L-80"><a href="#L-80"><span class="linenos"> 80</span></a>
|
||||
</span><span id="L-81"><a href="#L-81"><span class="linenos"> 81</span></a> <span class="c1"># Now append the rest</span>
|
||||
</span><span id="L-82"><a href="#L-82"><span class="linenos"> 82</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">itertools</span><span class="o">.</span><span class="n">chain</span><span class="p">(</span><span class="n">root</span><span class="o">.</span><span class="n">union_scopes</span><span class="p">,</span> <span class="n">root</span><span class="o">.</span><span class="n">subquery_scopes</span><span class="p">,</span> <span class="n">root</span><span class="o">.</span><span class="n">table_scopes</span><span class="p">):</span>
|
||||
</span><span id="L-83"><a href="#L-83"><span class="linenos"> 83</span></a> <span class="k">for</span> <span class="n">child_scope</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">traverse</span><span class="p">():</span>
|
||||
</span><span id="L-84"><a href="#L-84"><span class="linenos"> 84</span></a> <span class="n">new_cte</span> <span class="o">=</span> <span class="n">_eliminate</span><span class="p">(</span><span class="n">child_scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">)</span>
|
||||
</span><span id="L-85"><a href="#L-85"><span class="linenos"> 85</span></a> <span class="k">if</span> <span class="n">new_cte</span><span class="p">:</span>
|
||||
</span><span id="L-86"><a href="#L-86"><span class="linenos"> 86</span></a> <span class="n">new_ctes</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">new_cte</span><span class="p">)</span>
|
||||
</span><span id="L-87"><a href="#L-87"><span class="linenos"> 87</span></a>
|
||||
</span><span id="L-88"><a href="#L-88"><span class="linenos"> 88</span></a> <span class="k">if</span> <span class="n">new_ctes</span><span class="p">:</span>
|
||||
</span><span id="L-89"><a href="#L-89"><span class="linenos"> 89</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"with"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">With</span><span class="p">(</span><span class="n">expressions</span><span class="o">=</span><span class="n">new_ctes</span><span class="p">,</span> <span class="n">recursive</span><span class="o">=</span><span class="n">recursive</span><span class="p">))</span>
|
||||
</span><span id="L-90"><a href="#L-90"><span class="linenos"> 90</span></a>
|
||||
</span><span id="L-91"><a href="#L-91"><span class="linenos"> 91</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-92"><a href="#L-92"><span class="linenos"> 92</span></a>
|
||||
</span><span id="L-93"><a href="#L-93"><span class="linenos"> 93</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-94"><a href="#L-94"><span class="linenos"> 94</span></a>
|
||||
</span><span id="L-95"><a href="#L-95"><span class="linenos"> 95</span></a>
|
||||
</span><span id="L-96"><a href="#L-96"><span class="linenos"> 96</span></a><span class="k">def</span> <span class="nf">_eliminate</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">):</span>
|
||||
</span><span id="L-97"><a href="#L-97"><span class="linenos"> 97</span></a> <span class="k">if</span> <span class="n">scope</span><span class="o">.</span><span class="n">is_union</span><span class="p">:</span>
|
||||
</span><span id="L-98"><a href="#L-98"><span class="linenos"> 98</span></a> <span class="k">return</span> <span class="n">_eliminate_union</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">)</span>
|
||||
</span><span id="L-99"><a href="#L-99"><span class="linenos"> 99</span></a>
|
||||
</span><span id="L-100"><a href="#L-100"><span class="linenos">100</span></a> <span class="k">if</span> <span class="n">scope</span><span class="o">.</span><span class="n">is_derived_table</span><span class="p">:</span>
|
||||
</span><span id="L-101"><a href="#L-101"><span class="linenos">101</span></a> <span class="k">return</span> <span class="n">_eliminate_derived_table</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">)</span>
|
||||
</span><span id="L-102"><a href="#L-102"><span class="linenos">102</span></a>
|
||||
</span><span id="L-103"><a href="#L-103"><span class="linenos">103</span></a> <span class="k">if</span> <span class="n">scope</span><span class="o">.</span><span class="n">is_cte</span><span class="p">:</span>
|
||||
</span><span id="L-104"><a href="#L-104"><span class="linenos">104</span></a> <span class="k">return</span> <span class="n">_eliminate_cte</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">)</span>
|
||||
</span><span id="L-105"><a href="#L-105"><span class="linenos">105</span></a>
|
||||
</span><span id="L-106"><a href="#L-106"><span class="linenos">106</span></a>
|
||||
</span><span id="L-107"><a href="#L-107"><span class="linenos">107</span></a><span class="k">def</span> <span class="nf">_eliminate_union</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">):</span>
|
||||
</span><span id="L-108"><a href="#L-108"><span class="linenos">108</span></a> <span class="n">duplicate_cte_alias</span> <span class="o">=</span> <span class="n">existing_ctes</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="L-93"><a href="#L-93"><span class="linenos"> 93</span></a>
|
||||
</span><span id="L-94"><a href="#L-94"><span class="linenos"> 94</span></a><span class="k">def</span> <span class="nf">_eliminate</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">):</span>
|
||||
</span><span id="L-95"><a href="#L-95"><span class="linenos"> 95</span></a> <span class="k">if</span> <span class="n">scope</span><span class="o">.</span><span class="n">is_union</span><span class="p">:</span>
|
||||
</span><span id="L-96"><a href="#L-96"><span class="linenos"> 96</span></a> <span class="k">return</span> <span class="n">_eliminate_union</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">)</span>
|
||||
</span><span id="L-97"><a href="#L-97"><span class="linenos"> 97</span></a>
|
||||
</span><span id="L-98"><a href="#L-98"><span class="linenos"> 98</span></a> <span class="k">if</span> <span class="n">scope</span><span class="o">.</span><span class="n">is_derived_table</span><span class="p">:</span>
|
||||
</span><span id="L-99"><a href="#L-99"><span class="linenos"> 99</span></a> <span class="k">return</span> <span class="n">_eliminate_derived_table</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">)</span>
|
||||
</span><span id="L-100"><a href="#L-100"><span class="linenos">100</span></a>
|
||||
</span><span id="L-101"><a href="#L-101"><span class="linenos">101</span></a> <span class="k">if</span> <span class="n">scope</span><span class="o">.</span><span class="n">is_cte</span><span class="p">:</span>
|
||||
</span><span id="L-102"><a href="#L-102"><span class="linenos">102</span></a> <span class="k">return</span> <span class="n">_eliminate_cte</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">)</span>
|
||||
</span><span id="L-103"><a href="#L-103"><span class="linenos">103</span></a>
|
||||
</span><span id="L-104"><a href="#L-104"><span class="linenos">104</span></a>
|
||||
</span><span id="L-105"><a href="#L-105"><span class="linenos">105</span></a><span class="k">def</span> <span class="nf">_eliminate_union</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">):</span>
|
||||
</span><span id="L-106"><a href="#L-106"><span class="linenos">106</span></a> <span class="n">duplicate_cte_alias</span> <span class="o">=</span> <span class="n">existing_ctes</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="L-107"><a href="#L-107"><span class="linenos">107</span></a>
|
||||
</span><span id="L-108"><a href="#L-108"><span class="linenos">108</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">duplicate_cte_alias</span> <span class="ow">or</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">taken</span><span class="o">=</span><span class="n">taken</span><span class="p">,</span> <span class="n">base</span><span class="o">=</span><span class="s2">"cte"</span><span class="p">)</span>
|
||||
</span><span id="L-109"><a href="#L-109"><span class="linenos">109</span></a>
|
||||
</span><span id="L-110"><a href="#L-110"><span class="linenos">110</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">duplicate_cte_alias</span> <span class="ow">or</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">taken</span><span class="o">=</span><span class="n">taken</span><span class="p">,</span> <span class="n">base</span><span class="o">=</span><span class="s2">"cte"</span><span class="p">)</span>
|
||||
</span><span id="L-110"><a href="#L-110"><span class="linenos">110</span></a> <span class="n">taken</span><span class="p">[</span><span class="n">alias</span><span class="p">]</span> <span class="o">=</span> <span class="n">scope</span>
|
||||
</span><span id="L-111"><a href="#L-111"><span class="linenos">111</span></a>
|
||||
</span><span id="L-112"><a href="#L-112"><span class="linenos">112</span></a> <span class="n">taken</span><span class="p">[</span><span class="n">alias</span><span class="p">]</span> <span class="o">=</span> <span class="n">scope</span>
|
||||
</span><span id="L-113"><a href="#L-113"><span class="linenos">113</span></a>
|
||||
</span><span id="L-114"><a href="#L-114"><span class="linenos">114</span></a> <span class="c1"># Try to maintain the selections</span>
|
||||
</span><span id="L-115"><a href="#L-115"><span class="linenos">115</span></a> <span class="n">expressions</span> <span class="o">=</span> <span class="n">scope</span><span class="o">.</span><span class="n">selects</span>
|
||||
</span><span id="L-116"><a href="#L-116"><span class="linenos">116</span></a> <span class="n">selects</span> <span class="o">=</span> <span class="p">[</span>
|
||||
</span><span id="L-117"><a href="#L-117"><span class="linenos">117</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">alias_</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">column</span><span class="p">(</span><span class="n">e</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">,</span> <span class="n">table</span><span class="o">=</span><span class="n">alias</span><span class="p">),</span> <span class="n">alias</span><span class="o">=</span><span class="n">e</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">)</span>
|
||||
</span><span id="L-118"><a href="#L-118"><span class="linenos">118</span></a> <span class="k">for</span> <span class="n">e</span> <span class="ow">in</span> <span class="n">expressions</span>
|
||||
</span><span id="L-119"><a href="#L-119"><span class="linenos">119</span></a> <span class="k">if</span> <span class="n">e</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="L-120"><a href="#L-120"><span class="linenos">120</span></a> <span class="p">]</span>
|
||||
</span><span id="L-121"><a href="#L-121"><span class="linenos">121</span></a> <span class="c1"># If not all selections have an alias, just select *</span>
|
||||
</span><span id="L-122"><a href="#L-122"><span class="linenos">122</span></a> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">selects</span><span class="p">)</span> <span class="o">!=</span> <span class="nb">len</span><span class="p">(</span><span class="n">expressions</span><span class="p">):</span>
|
||||
</span><span id="L-123"><a href="#L-123"><span class="linenos">123</span></a> <span class="n">selects</span> <span class="o">=</span> <span class="p">[</span><span class="s2">"*"</span><span class="p">]</span>
|
||||
</span><span id="L-112"><a href="#L-112"><span class="linenos">112</span></a> <span class="c1"># Try to maintain the selections</span>
|
||||
</span><span id="L-113"><a href="#L-113"><span class="linenos">113</span></a> <span class="n">expressions</span> <span class="o">=</span> <span class="n">scope</span><span class="o">.</span><span class="n">selects</span>
|
||||
</span><span id="L-114"><a href="#L-114"><span class="linenos">114</span></a> <span class="n">selects</span> <span class="o">=</span> <span class="p">[</span>
|
||||
</span><span id="L-115"><a href="#L-115"><span class="linenos">115</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">alias_</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">column</span><span class="p">(</span><span class="n">e</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">,</span> <span class="n">table</span><span class="o">=</span><span class="n">alias</span><span class="p">),</span> <span class="n">alias</span><span class="o">=</span><span class="n">e</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">)</span>
|
||||
</span><span id="L-116"><a href="#L-116"><span class="linenos">116</span></a> <span class="k">for</span> <span class="n">e</span> <span class="ow">in</span> <span class="n">expressions</span>
|
||||
</span><span id="L-117"><a href="#L-117"><span class="linenos">117</span></a> <span class="k">if</span> <span class="n">e</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="L-118"><a href="#L-118"><span class="linenos">118</span></a> <span class="p">]</span>
|
||||
</span><span id="L-119"><a href="#L-119"><span class="linenos">119</span></a> <span class="c1"># If not all selections have an alias, just select *</span>
|
||||
</span><span id="L-120"><a href="#L-120"><span class="linenos">120</span></a> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">selects</span><span class="p">)</span> <span class="o">!=</span> <span class="nb">len</span><span class="p">(</span><span class="n">expressions</span><span class="p">):</span>
|
||||
</span><span id="L-121"><a href="#L-121"><span class="linenos">121</span></a> <span class="n">selects</span> <span class="o">=</span> <span class="p">[</span><span class="s2">"*"</span><span class="p">]</span>
|
||||
</span><span id="L-122"><a href="#L-122"><span class="linenos">122</span></a>
|
||||
</span><span id="L-123"><a href="#L-123"><span class="linenos">123</span></a> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="o">*</span><span class="n">selects</span><span class="p">)</span><span class="o">.</span><span class="n">from_</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">alias_</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">table_</span><span class="p">(</span><span class="n">alias</span><span class="p">),</span> <span class="n">alias</span><span class="o">=</span><span class="n">alias</span><span class="p">)))</span>
|
||||
</span><span id="L-124"><a href="#L-124"><span class="linenos">124</span></a>
|
||||
</span><span id="L-125"><a href="#L-125"><span class="linenos">125</span></a> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="o">*</span><span class="n">selects</span><span class="p">)</span><span class="o">.</span><span class="n">from_</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">alias_</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">table_</span><span class="p">(</span><span class="n">alias</span><span class="p">),</span> <span class="n">alias</span><span class="o">=</span><span class="n">alias</span><span class="p">)))</span>
|
||||
</span><span id="L-126"><a href="#L-126"><span class="linenos">126</span></a>
|
||||
</span><span id="L-127"><a href="#L-127"><span class="linenos">127</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">duplicate_cte_alias</span><span class="p">:</span>
|
||||
</span><span id="L-128"><a href="#L-128"><span class="linenos">128</span></a> <span class="n">existing_ctes</span><span class="p">[</span><span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="p">]</span> <span class="o">=</span> <span class="n">alias</span>
|
||||
</span><span id="L-129"><a href="#L-129"><span class="linenos">129</span></a> <span class="k">return</span> <span class="n">exp</span><span class="o">.</span><span class="n">CTE</span><span class="p">(</span>
|
||||
</span><span id="L-130"><a href="#L-130"><span class="linenos">130</span></a> <span class="n">this</span><span class="o">=</span><span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="p">,</span>
|
||||
</span><span id="L-131"><a href="#L-131"><span class="linenos">131</span></a> <span class="n">alias</span><span class="o">=</span><span class="n">exp</span><span class="o">.</span><span class="n">TableAlias</span><span class="p">(</span><span class="n">this</span><span class="o">=</span><span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">alias</span><span class="p">)),</span>
|
||||
</span><span id="L-132"><a href="#L-132"><span class="linenos">132</span></a> <span class="p">)</span>
|
||||
</span><span id="L-133"><a href="#L-133"><span class="linenos">133</span></a>
|
||||
</span><span id="L-134"><a href="#L-134"><span class="linenos">134</span></a>
|
||||
</span><span id="L-135"><a href="#L-135"><span class="linenos">135</span></a><span class="k">def</span> <span class="nf">_eliminate_derived_table</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">):</span>
|
||||
</span><span id="L-136"><a href="#L-136"><span class="linenos">136</span></a> <span class="n">parent</span> <span class="o">=</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">parent</span>
|
||||
</span><span id="L-137"><a href="#L-137"><span class="linenos">137</span></a> <span class="n">name</span><span class="p">,</span> <span class="n">cte</span> <span class="o">=</span> <span class="n">_new_cte</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">)</span>
|
||||
</span><span id="L-138"><a href="#L-138"><span class="linenos">138</span></a>
|
||||
</span><span id="L-139"><a href="#L-139"><span class="linenos">139</span></a> <span class="n">table</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">alias_</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">table_</span><span class="p">(</span><span class="n">name</span><span class="p">),</span> <span class="n">alias</span><span class="o">=</span><span class="n">parent</span><span class="o">.</span><span class="n">alias</span> <span class="ow">or</span> <span class="n">name</span><span class="p">)</span>
|
||||
</span><span id="L-140"><a href="#L-140"><span class="linenos">140</span></a> <span class="n">parent</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">table</span><span class="p">)</span>
|
||||
</span><span id="L-125"><a href="#L-125"><span class="linenos">125</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">duplicate_cte_alias</span><span class="p">:</span>
|
||||
</span><span id="L-126"><a href="#L-126"><span class="linenos">126</span></a> <span class="n">existing_ctes</span><span class="p">[</span><span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="p">]</span> <span class="o">=</span> <span class="n">alias</span>
|
||||
</span><span id="L-127"><a href="#L-127"><span class="linenos">127</span></a> <span class="k">return</span> <span class="n">exp</span><span class="o">.</span><span class="n">CTE</span><span class="p">(</span>
|
||||
</span><span id="L-128"><a href="#L-128"><span class="linenos">128</span></a> <span class="n">this</span><span class="o">=</span><span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="p">,</span>
|
||||
</span><span id="L-129"><a href="#L-129"><span class="linenos">129</span></a> <span class="n">alias</span><span class="o">=</span><span class="n">exp</span><span class="o">.</span><span class="n">TableAlias</span><span class="p">(</span><span class="n">this</span><span class="o">=</span><span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">alias</span><span class="p">)),</span>
|
||||
</span><span id="L-130"><a href="#L-130"><span class="linenos">130</span></a> <span class="p">)</span>
|
||||
</span><span id="L-131"><a href="#L-131"><span class="linenos">131</span></a>
|
||||
</span><span id="L-132"><a href="#L-132"><span class="linenos">132</span></a>
|
||||
</span><span id="L-133"><a href="#L-133"><span class="linenos">133</span></a><span class="k">def</span> <span class="nf">_eliminate_derived_table</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">):</span>
|
||||
</span><span id="L-134"><a href="#L-134"><span class="linenos">134</span></a> <span class="n">parent</span> <span class="o">=</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">parent</span>
|
||||
</span><span id="L-135"><a href="#L-135"><span class="linenos">135</span></a> <span class="n">name</span><span class="p">,</span> <span class="n">cte</span> <span class="o">=</span> <span class="n">_new_cte</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">)</span>
|
||||
</span><span id="L-136"><a href="#L-136"><span class="linenos">136</span></a>
|
||||
</span><span id="L-137"><a href="#L-137"><span class="linenos">137</span></a> <span class="n">table</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">alias_</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">table_</span><span class="p">(</span><span class="n">name</span><span class="p">),</span> <span class="n">alias</span><span class="o">=</span><span class="n">parent</span><span class="o">.</span><span class="n">alias</span> <span class="ow">or</span> <span class="n">name</span><span class="p">)</span>
|
||||
</span><span id="L-138"><a href="#L-138"><span class="linenos">138</span></a> <span class="n">parent</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">table</span><span class="p">)</span>
|
||||
</span><span id="L-139"><a href="#L-139"><span class="linenos">139</span></a>
|
||||
</span><span id="L-140"><a href="#L-140"><span class="linenos">140</span></a> <span class="k">return</span> <span class="n">cte</span>
|
||||
</span><span id="L-141"><a href="#L-141"><span class="linenos">141</span></a>
|
||||
</span><span id="L-142"><a href="#L-142"><span class="linenos">142</span></a> <span class="k">return</span> <span class="n">cte</span>
|
||||
</span><span id="L-143"><a href="#L-143"><span class="linenos">143</span></a>
|
||||
</span><span id="L-144"><a href="#L-144"><span class="linenos">144</span></a>
|
||||
</span><span id="L-145"><a href="#L-145"><span class="linenos">145</span></a><span class="k">def</span> <span class="nf">_eliminate_cte</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">):</span>
|
||||
</span><span id="L-146"><a href="#L-146"><span class="linenos">146</span></a> <span class="n">parent</span> <span class="o">=</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">parent</span>
|
||||
</span><span id="L-147"><a href="#L-147"><span class="linenos">147</span></a> <span class="n">name</span><span class="p">,</span> <span class="n">cte</span> <span class="o">=</span> <span class="n">_new_cte</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">)</span>
|
||||
</span><span id="L-148"><a href="#L-148"><span class="linenos">148</span></a>
|
||||
</span><span id="L-149"><a href="#L-149"><span class="linenos">149</span></a> <span class="n">with_</span> <span class="o">=</span> <span class="n">parent</span><span class="o">.</span><span class="n">parent</span>
|
||||
</span><span id="L-150"><a href="#L-150"><span class="linenos">150</span></a> <span class="n">parent</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span>
|
||||
</span><span id="L-151"><a href="#L-151"><span class="linenos">151</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">with_</span><span class="o">.</span><span class="n">expressions</span><span class="p">:</span>
|
||||
</span><span id="L-152"><a href="#L-152"><span class="linenos">152</span></a> <span class="n">with_</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span>
|
||||
</span><span id="L-153"><a href="#L-153"><span class="linenos">153</span></a>
|
||||
</span><span id="L-154"><a href="#L-154"><span class="linenos">154</span></a> <span class="c1"># Rename references to this CTE</span>
|
||||
</span><span id="L-155"><a href="#L-155"><span class="linenos">155</span></a> <span class="k">for</span> <span class="n">child_scope</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">parent</span><span class="o">.</span><span class="n">traverse</span><span class="p">():</span>
|
||||
</span><span id="L-156"><a href="#L-156"><span class="linenos">156</span></a> <span class="k">for</span> <span class="n">table</span><span class="p">,</span> <span class="n">source</span> <span class="ow">in</span> <span class="n">child_scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="o">.</span><span class="n">values</span><span class="p">():</span>
|
||||
</span><span id="L-157"><a href="#L-157"><span class="linenos">157</span></a> <span class="k">if</span> <span class="n">source</span> <span class="ow">is</span> <span class="n">scope</span><span class="p">:</span>
|
||||
</span><span id="L-158"><a href="#L-158"><span class="linenos">158</span></a> <span class="n">new_table</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">alias_</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">table_</span><span class="p">(</span><span class="n">name</span><span class="p">),</span> <span class="n">alias</span><span class="o">=</span><span class="n">table</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">)</span>
|
||||
</span><span id="L-159"><a href="#L-159"><span class="linenos">159</span></a> <span class="n">table</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">new_table</span><span class="p">)</span>
|
||||
</span><span id="L-142"><a href="#L-142"><span class="linenos">142</span></a>
|
||||
</span><span id="L-143"><a href="#L-143"><span class="linenos">143</span></a><span class="k">def</span> <span class="nf">_eliminate_cte</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">):</span>
|
||||
</span><span id="L-144"><a href="#L-144"><span class="linenos">144</span></a> <span class="n">parent</span> <span class="o">=</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">parent</span>
|
||||
</span><span id="L-145"><a href="#L-145"><span class="linenos">145</span></a> <span class="n">name</span><span class="p">,</span> <span class="n">cte</span> <span class="o">=</span> <span class="n">_new_cte</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">)</span>
|
||||
</span><span id="L-146"><a href="#L-146"><span class="linenos">146</span></a>
|
||||
</span><span id="L-147"><a href="#L-147"><span class="linenos">147</span></a> <span class="n">with_</span> <span class="o">=</span> <span class="n">parent</span><span class="o">.</span><span class="n">parent</span>
|
||||
</span><span id="L-148"><a href="#L-148"><span class="linenos">148</span></a> <span class="n">parent</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span>
|
||||
</span><span id="L-149"><a href="#L-149"><span class="linenos">149</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">with_</span><span class="o">.</span><span class="n">expressions</span><span class="p">:</span>
|
||||
</span><span id="L-150"><a href="#L-150"><span class="linenos">150</span></a> <span class="n">with_</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span>
|
||||
</span><span id="L-151"><a href="#L-151"><span class="linenos">151</span></a>
|
||||
</span><span id="L-152"><a href="#L-152"><span class="linenos">152</span></a> <span class="c1"># Rename references to this CTE</span>
|
||||
</span><span id="L-153"><a href="#L-153"><span class="linenos">153</span></a> <span class="k">for</span> <span class="n">child_scope</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">parent</span><span class="o">.</span><span class="n">traverse</span><span class="p">():</span>
|
||||
</span><span id="L-154"><a href="#L-154"><span class="linenos">154</span></a> <span class="k">for</span> <span class="n">table</span><span class="p">,</span> <span class="n">source</span> <span class="ow">in</span> <span class="n">child_scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="o">.</span><span class="n">values</span><span class="p">():</span>
|
||||
</span><span id="L-155"><a href="#L-155"><span class="linenos">155</span></a> <span class="k">if</span> <span class="n">source</span> <span class="ow">is</span> <span class="n">scope</span><span class="p">:</span>
|
||||
</span><span id="L-156"><a href="#L-156"><span class="linenos">156</span></a> <span class="n">new_table</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">alias_</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">table_</span><span class="p">(</span><span class="n">name</span><span class="p">),</span> <span class="n">alias</span><span class="o">=</span><span class="n">table</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">)</span>
|
||||
</span><span id="L-157"><a href="#L-157"><span class="linenos">157</span></a> <span class="n">table</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">new_table</span><span class="p">)</span>
|
||||
</span><span id="L-158"><a href="#L-158"><span class="linenos">158</span></a>
|
||||
</span><span id="L-159"><a href="#L-159"><span class="linenos">159</span></a> <span class="k">return</span> <span class="n">cte</span>
|
||||
</span><span id="L-160"><a href="#L-160"><span class="linenos">160</span></a>
|
||||
</span><span id="L-161"><a href="#L-161"><span class="linenos">161</span></a> <span class="k">return</span> <span class="n">cte</span>
|
||||
</span><span id="L-162"><a href="#L-162"><span class="linenos">162</span></a>
|
||||
</span><span id="L-163"><a href="#L-163"><span class="linenos">163</span></a>
|
||||
</span><span id="L-164"><a href="#L-164"><span class="linenos">164</span></a><span class="k">def</span> <span class="nf">_new_cte</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">):</span>
|
||||
</span><span id="L-165"><a href="#L-165"><span class="linenos">165</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-166"><a href="#L-166"><span class="linenos">166</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="L-167"><a href="#L-167"><span class="linenos">167</span></a><span class="sd"> tuple of (name, cte)</span>
|
||||
</span><span id="L-168"><a href="#L-168"><span class="linenos">168</span></a><span class="sd"> where `name` is a new name for this CTE in the root scope and `cte` is a new CTE instance.</span>
|
||||
</span><span id="L-169"><a href="#L-169"><span class="linenos">169</span></a><span class="sd"> If this CTE duplicates an existing CTE, `cte` will be None.</span>
|
||||
</span><span id="L-170"><a href="#L-170"><span class="linenos">170</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-171"><a href="#L-171"><span class="linenos">171</span></a> <span class="n">duplicate_cte_alias</span> <span class="o">=</span> <span class="n">existing_ctes</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="L-172"><a href="#L-172"><span class="linenos">172</span></a> <span class="n">parent</span> <span class="o">=</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">parent</span>
|
||||
</span><span id="L-173"><a href="#L-173"><span class="linenos">173</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">parent</span><span class="o">.</span><span class="n">alias</span>
|
||||
</span><span id="L-174"><a href="#L-174"><span class="linenos">174</span></a>
|
||||
</span><span id="L-175"><a href="#L-175"><span class="linenos">175</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">name</span><span class="p">:</span>
|
||||
</span><span id="L-176"><a href="#L-176"><span class="linenos">176</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">taken</span><span class="o">=</span><span class="n">taken</span><span class="p">,</span> <span class="n">base</span><span class="o">=</span><span class="s2">"cte"</span><span class="p">)</span>
|
||||
</span><span id="L-177"><a href="#L-177"><span class="linenos">177</span></a>
|
||||
</span><span id="L-178"><a href="#L-178"><span class="linenos">178</span></a> <span class="k">if</span> <span class="n">duplicate_cte_alias</span><span class="p">:</span>
|
||||
</span><span id="L-179"><a href="#L-179"><span class="linenos">179</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">duplicate_cte_alias</span>
|
||||
</span><span id="L-180"><a href="#L-180"><span class="linenos">180</span></a> <span class="k">elif</span> <span class="n">taken</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">name</span><span class="p">):</span>
|
||||
</span><span id="L-181"><a href="#L-181"><span class="linenos">181</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">taken</span><span class="o">=</span><span class="n">taken</span><span class="p">,</span> <span class="n">base</span><span class="o">=</span><span class="n">name</span><span class="p">)</span>
|
||||
</span><span id="L-161"><a href="#L-161"><span class="linenos">161</span></a>
|
||||
</span><span id="L-162"><a href="#L-162"><span class="linenos">162</span></a><span class="k">def</span> <span class="nf">_new_cte</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">):</span>
|
||||
</span><span id="L-163"><a href="#L-163"><span class="linenos">163</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-164"><a href="#L-164"><span class="linenos">164</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="L-165"><a href="#L-165"><span class="linenos">165</span></a><span class="sd"> tuple of (name, cte)</span>
|
||||
</span><span id="L-166"><a href="#L-166"><span class="linenos">166</span></a><span class="sd"> where `name` is a new name for this CTE in the root scope and `cte` is a new CTE instance.</span>
|
||||
</span><span id="L-167"><a href="#L-167"><span class="linenos">167</span></a><span class="sd"> If this CTE duplicates an existing CTE, `cte` will be None.</span>
|
||||
</span><span id="L-168"><a href="#L-168"><span class="linenos">168</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-169"><a href="#L-169"><span class="linenos">169</span></a> <span class="n">duplicate_cte_alias</span> <span class="o">=</span> <span class="n">existing_ctes</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="L-170"><a href="#L-170"><span class="linenos">170</span></a> <span class="n">parent</span> <span class="o">=</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">parent</span>
|
||||
</span><span id="L-171"><a href="#L-171"><span class="linenos">171</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">parent</span><span class="o">.</span><span class="n">alias</span>
|
||||
</span><span id="L-172"><a href="#L-172"><span class="linenos">172</span></a>
|
||||
</span><span id="L-173"><a href="#L-173"><span class="linenos">173</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">name</span><span class="p">:</span>
|
||||
</span><span id="L-174"><a href="#L-174"><span class="linenos">174</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">taken</span><span class="o">=</span><span class="n">taken</span><span class="p">,</span> <span class="n">base</span><span class="o">=</span><span class="s2">"cte"</span><span class="p">)</span>
|
||||
</span><span id="L-175"><a href="#L-175"><span class="linenos">175</span></a>
|
||||
</span><span id="L-176"><a href="#L-176"><span class="linenos">176</span></a> <span class="k">if</span> <span class="n">duplicate_cte_alias</span><span class="p">:</span>
|
||||
</span><span id="L-177"><a href="#L-177"><span class="linenos">177</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">duplicate_cte_alias</span>
|
||||
</span><span id="L-178"><a href="#L-178"><span class="linenos">178</span></a> <span class="k">elif</span> <span class="n">taken</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">name</span><span class="p">):</span>
|
||||
</span><span id="L-179"><a href="#L-179"><span class="linenos">179</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">taken</span><span class="o">=</span><span class="n">taken</span><span class="p">,</span> <span class="n">base</span><span class="o">=</span><span class="n">name</span><span class="p">)</span>
|
||||
</span><span id="L-180"><a href="#L-180"><span class="linenos">180</span></a>
|
||||
</span><span id="L-181"><a href="#L-181"><span class="linenos">181</span></a> <span class="n">taken</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">scope</span>
|
||||
</span><span id="L-182"><a href="#L-182"><span class="linenos">182</span></a>
|
||||
</span><span id="L-183"><a href="#L-183"><span class="linenos">183</span></a> <span class="n">taken</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">scope</span>
|
||||
</span><span id="L-184"><a href="#L-184"><span class="linenos">184</span></a>
|
||||
</span><span id="L-185"><a href="#L-185"><span class="linenos">185</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">duplicate_cte_alias</span><span class="p">:</span>
|
||||
</span><span id="L-186"><a href="#L-186"><span class="linenos">186</span></a> <span class="n">existing_ctes</span><span class="p">[</span><span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="p">]</span> <span class="o">=</span> <span class="n">name</span>
|
||||
</span><span id="L-187"><a href="#L-187"><span class="linenos">187</span></a> <span class="n">cte</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">CTE</span><span class="p">(</span>
|
||||
</span><span id="L-188"><a href="#L-188"><span class="linenos">188</span></a> <span class="n">this</span><span class="o">=</span><span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="p">,</span>
|
||||
</span><span id="L-189"><a href="#L-189"><span class="linenos">189</span></a> <span class="n">alias</span><span class="o">=</span><span class="n">exp</span><span class="o">.</span><span class="n">TableAlias</span><span class="p">(</span><span class="n">this</span><span class="o">=</span><span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">name</span><span class="p">)),</span>
|
||||
</span><span id="L-190"><a href="#L-190"><span class="linenos">190</span></a> <span class="p">)</span>
|
||||
</span><span id="L-191"><a href="#L-191"><span class="linenos">191</span></a> <span class="k">else</span><span class="p">:</span>
|
||||
</span><span id="L-192"><a href="#L-192"><span class="linenos">192</span></a> <span class="n">cte</span> <span class="o">=</span> <span class="kc">None</span>
|
||||
</span><span id="L-193"><a href="#L-193"><span class="linenos">193</span></a> <span class="k">return</span> <span class="n">name</span><span class="p">,</span> <span class="n">cte</span>
|
||||
</span><span id="L-183"><a href="#L-183"><span class="linenos">183</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">duplicate_cte_alias</span><span class="p">:</span>
|
||||
</span><span id="L-184"><a href="#L-184"><span class="linenos">184</span></a> <span class="n">existing_ctes</span><span class="p">[</span><span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="p">]</span> <span class="o">=</span> <span class="n">name</span>
|
||||
</span><span id="L-185"><a href="#L-185"><span class="linenos">185</span></a> <span class="n">cte</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">CTE</span><span class="p">(</span>
|
||||
</span><span id="L-186"><a href="#L-186"><span class="linenos">186</span></a> <span class="n">this</span><span class="o">=</span><span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="p">,</span>
|
||||
</span><span id="L-187"><a href="#L-187"><span class="linenos">187</span></a> <span class="n">alias</span><span class="o">=</span><span class="n">exp</span><span class="o">.</span><span class="n">TableAlias</span><span class="p">(</span><span class="n">this</span><span class="o">=</span><span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">name</span><span class="p">)),</span>
|
||||
</span><span id="L-188"><a href="#L-188"><span class="linenos">188</span></a> <span class="p">)</span>
|
||||
</span><span id="L-189"><a href="#L-189"><span class="linenos">189</span></a> <span class="k">else</span><span class="p">:</span>
|
||||
</span><span id="L-190"><a href="#L-190"><span class="linenos">190</span></a> <span class="n">cte</span> <span class="o">=</span> <span class="kc">None</span>
|
||||
</span><span id="L-191"><a href="#L-191"><span class="linenos">191</span></a> <span class="k">return</span> <span class="n">name</span><span class="p">,</span> <span class="n">cte</span>
|
||||
</span></pre></div>
|
||||
|
||||
|
||||
|
|
@ -264,91 +262,90 @@
|
|||
|
||||
</div>
|
||||
<a class="headerlink" href="#eliminate_subqueries"></a>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="eliminate_subqueries-10"><a href="#eliminate_subqueries-10"><span class="linenos">10</span></a><span class="k">def</span> <span class="nf">eliminate_subqueries</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="eliminate_subqueries-11"><a href="#eliminate_subqueries-11"><span class="linenos">11</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="eliminate_subqueries-12"><a href="#eliminate_subqueries-12"><span class="linenos">12</span></a><span class="sd"> Rewrite derived tables as CTES, deduplicating if possible.</span>
|
||||
</span><span id="eliminate_subqueries-13"><a href="#eliminate_subqueries-13"><span class="linenos">13</span></a>
|
||||
</span><span id="eliminate_subqueries-14"><a href="#eliminate_subqueries-14"><span class="linenos">14</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="eliminate_subqueries-15"><a href="#eliminate_subqueries-15"><span class="linenos">15</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="eliminate_subqueries-16"><a href="#eliminate_subqueries-16"><span class="linenos">16</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT a FROM (SELECT * FROM x) AS y")</span>
|
||||
</span><span id="eliminate_subqueries-17"><a href="#eliminate_subqueries-17"><span class="linenos">17</span></a><span class="sd"> >>> eliminate_subqueries(expression).sql()</span>
|
||||
</span><span id="eliminate_subqueries-18"><a href="#eliminate_subqueries-18"><span class="linenos">18</span></a><span class="sd"> 'WITH y AS (SELECT * FROM x) SELECT a FROM y AS y'</span>
|
||||
</span><span id="eliminate_subqueries-19"><a href="#eliminate_subqueries-19"><span class="linenos">19</span></a>
|
||||
</span><span id="eliminate_subqueries-20"><a href="#eliminate_subqueries-20"><span class="linenos">20</span></a><span class="sd"> This also deduplicates common subqueries:</span>
|
||||
</span><span id="eliminate_subqueries-21"><a href="#eliminate_subqueries-21"><span class="linenos">21</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT a FROM (SELECT * FROM x) AS y JOIN (SELECT * FROM x) AS z")</span>
|
||||
</span><span id="eliminate_subqueries-22"><a href="#eliminate_subqueries-22"><span class="linenos">22</span></a><span class="sd"> >>> eliminate_subqueries(expression).sql()</span>
|
||||
</span><span id="eliminate_subqueries-23"><a href="#eliminate_subqueries-23"><span class="linenos">23</span></a><span class="sd"> 'WITH y AS (SELECT * FROM x) SELECT a FROM y AS y JOIN y AS z'</span>
|
||||
</span><span id="eliminate_subqueries-24"><a href="#eliminate_subqueries-24"><span class="linenos">24</span></a>
|
||||
</span><span id="eliminate_subqueries-25"><a href="#eliminate_subqueries-25"><span class="linenos">25</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="eliminate_subqueries-26"><a href="#eliminate_subqueries-26"><span class="linenos">26</span></a><span class="sd"> expression (sqlglot.Expression): expression</span>
|
||||
</span><span id="eliminate_subqueries-27"><a href="#eliminate_subqueries-27"><span class="linenos">27</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="eliminate_subqueries-28"><a href="#eliminate_subqueries-28"><span class="linenos">28</span></a><span class="sd"> sqlglot.Expression: expression</span>
|
||||
</span><span id="eliminate_subqueries-29"><a href="#eliminate_subqueries-29"><span class="linenos">29</span></a><span class="sd"> """</span>
|
||||
</span><span id="eliminate_subqueries-30"><a href="#eliminate_subqueries-30"><span class="linenos">30</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Subquery</span><span class="p">):</span>
|
||||
</span><span id="eliminate_subqueries-31"><a href="#eliminate_subqueries-31"><span class="linenos">31</span></a> <span class="c1"># It's possible to have subqueries at the root, e.g. (SELECT * FROM x) LIMIT 1</span>
|
||||
</span><span id="eliminate_subqueries-32"><a href="#eliminate_subqueries-32"><span class="linenos">32</span></a> <span class="n">eliminate_subqueries</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">this</span><span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-33"><a href="#eliminate_subqueries-33"><span class="linenos">33</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="eliminate_subqueries-34"><a href="#eliminate_subqueries-34"><span class="linenos">34</span></a>
|
||||
</span><span id="eliminate_subqueries-35"><a href="#eliminate_subqueries-35"><span class="linenos">35</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">simplify</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-36"><a href="#eliminate_subqueries-36"><span class="linenos">36</span></a> <span class="n">root</span> <span class="o">=</span> <span class="n">build_scope</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-37"><a href="#eliminate_subqueries-37"><span class="linenos">37</span></a>
|
||||
</span><span id="eliminate_subqueries-38"><a href="#eliminate_subqueries-38"><span class="linenos">38</span></a> <span class="c1"># Map of alias->Scope|Table</span>
|
||||
</span><span id="eliminate_subqueries-39"><a href="#eliminate_subqueries-39"><span class="linenos">39</span></a> <span class="c1"># These are all aliases that are already used in the expression.</span>
|
||||
</span><span id="eliminate_subqueries-40"><a href="#eliminate_subqueries-40"><span class="linenos">40</span></a> <span class="c1"># We don't want to create new CTEs that conflict with these names.</span>
|
||||
</span><span id="eliminate_subqueries-41"><a href="#eliminate_subqueries-41"><span class="linenos">41</span></a> <span class="n">taken</span> <span class="o">=</span> <span class="p">{}</span>
|
||||
</span><span id="eliminate_subqueries-42"><a href="#eliminate_subqueries-42"><span class="linenos">42</span></a>
|
||||
</span><span id="eliminate_subqueries-43"><a href="#eliminate_subqueries-43"><span class="linenos">43</span></a> <span class="c1"># All CTE aliases in the root scope are taken</span>
|
||||
</span><span id="eliminate_subqueries-44"><a href="#eliminate_subqueries-44"><span class="linenos">44</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">root</span><span class="o">.</span><span class="n">cte_scopes</span><span class="p">:</span>
|
||||
</span><span id="eliminate_subqueries-45"><a href="#eliminate_subqueries-45"><span class="linenos">45</span></a> <span class="n">taken</span><span class="p">[</span><span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">parent</span><span class="o">.</span><span class="n">alias</span><span class="p">]</span> <span class="o">=</span> <span class="n">scope</span>
|
||||
</span><span id="eliminate_subqueries-46"><a href="#eliminate_subqueries-46"><span class="linenos">46</span></a>
|
||||
</span><span id="eliminate_subqueries-47"><a href="#eliminate_subqueries-47"><span class="linenos">47</span></a> <span class="c1"># All table names are taken</span>
|
||||
</span><span id="eliminate_subqueries-48"><a href="#eliminate_subqueries-48"><span class="linenos">48</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">root</span><span class="o">.</span><span class="n">traverse</span><span class="p">():</span>
|
||||
</span><span id="eliminate_subqueries-49"><a href="#eliminate_subqueries-49"><span class="linenos">49</span></a> <span class="n">taken</span><span class="o">.</span><span class="n">update</span><span class="p">(</span>
|
||||
</span><span id="eliminate_subqueries-50"><a href="#eliminate_subqueries-50"><span class="linenos">50</span></a> <span class="p">{</span>
|
||||
</span><span id="eliminate_subqueries-51"><a href="#eliminate_subqueries-51"><span class="linenos">51</span></a> <span class="n">source</span><span class="o">.</span><span class="n">name</span><span class="p">:</span> <span class="n">source</span>
|
||||
</span><span id="eliminate_subqueries-52"><a href="#eliminate_subqueries-52"><span class="linenos">52</span></a> <span class="k">for</span> <span class="n">_</span><span class="p">,</span> <span class="n">source</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">sources</span><span class="o">.</span><span class="n">items</span><span class="p">()</span>
|
||||
</span><span id="eliminate_subqueries-53"><a href="#eliminate_subqueries-53"><span class="linenos">53</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Table</span><span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-54"><a href="#eliminate_subqueries-54"><span class="linenos">54</span></a> <span class="p">}</span>
|
||||
</span><span id="eliminate_subqueries-55"><a href="#eliminate_subqueries-55"><span class="linenos">55</span></a> <span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-56"><a href="#eliminate_subqueries-56"><span class="linenos">56</span></a>
|
||||
</span><span id="eliminate_subqueries-57"><a href="#eliminate_subqueries-57"><span class="linenos">57</span></a> <span class="c1"># Map of Expression->alias</span>
|
||||
</span><span id="eliminate_subqueries-58"><a href="#eliminate_subqueries-58"><span class="linenos">58</span></a> <span class="c1"># Existing CTES in the root expression. We'll use this for deduplication.</span>
|
||||
</span><span id="eliminate_subqueries-59"><a href="#eliminate_subqueries-59"><span class="linenos">59</span></a> <span class="n">existing_ctes</span> <span class="o">=</span> <span class="p">{}</span>
|
||||
</span><span id="eliminate_subqueries-60"><a href="#eliminate_subqueries-60"><span class="linenos">60</span></a>
|
||||
</span><span id="eliminate_subqueries-61"><a href="#eliminate_subqueries-61"><span class="linenos">61</span></a> <span class="n">with_</span> <span class="o">=</span> <span class="n">root</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"with"</span><span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-62"><a href="#eliminate_subqueries-62"><span class="linenos">62</span></a> <span class="n">recursive</span> <span class="o">=</span> <span class="kc">False</span>
|
||||
</span><span id="eliminate_subqueries-63"><a href="#eliminate_subqueries-63"><span class="linenos">63</span></a> <span class="k">if</span> <span class="n">with_</span><span class="p">:</span>
|
||||
</span><span id="eliminate_subqueries-64"><a href="#eliminate_subqueries-64"><span class="linenos">64</span></a> <span class="n">recursive</span> <span class="o">=</span> <span class="n">with_</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"recursive"</span><span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-65"><a href="#eliminate_subqueries-65"><span class="linenos">65</span></a> <span class="k">for</span> <span class="n">cte</span> <span class="ow">in</span> <span class="n">with_</span><span class="o">.</span><span class="n">expressions</span><span class="p">:</span>
|
||||
</span><span id="eliminate_subqueries-66"><a href="#eliminate_subqueries-66"><span class="linenos">66</span></a> <span class="n">existing_ctes</span><span class="p">[</span><span class="n">cte</span><span class="o">.</span><span class="n">this</span><span class="p">]</span> <span class="o">=</span> <span class="n">cte</span><span class="o">.</span><span class="n">alias</span>
|
||||
</span><span id="eliminate_subqueries-67"><a href="#eliminate_subqueries-67"><span class="linenos">67</span></a> <span class="n">new_ctes</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
</span><span id="eliminate_subqueries-68"><a href="#eliminate_subqueries-68"><span class="linenos">68</span></a>
|
||||
</span><span id="eliminate_subqueries-69"><a href="#eliminate_subqueries-69"><span class="linenos">69</span></a> <span class="c1"># We're adding more CTEs, but we want to maintain the DAG order.</span>
|
||||
</span><span id="eliminate_subqueries-70"><a href="#eliminate_subqueries-70"><span class="linenos">70</span></a> <span class="c1"># Derived tables within an existing CTE need to come before the existing CTE.</span>
|
||||
</span><span id="eliminate_subqueries-71"><a href="#eliminate_subqueries-71"><span class="linenos">71</span></a> <span class="k">for</span> <span class="n">cte_scope</span> <span class="ow">in</span> <span class="n">root</span><span class="o">.</span><span class="n">cte_scopes</span><span class="p">:</span>
|
||||
</span><span id="eliminate_subqueries-72"><a href="#eliminate_subqueries-72"><span class="linenos">72</span></a> <span class="c1"># Append all the new CTEs from this existing CTE</span>
|
||||
</span><span id="eliminate_subqueries-73"><a href="#eliminate_subqueries-73"><span class="linenos">73</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">cte_scope</span><span class="o">.</span><span class="n">traverse</span><span class="p">():</span>
|
||||
</span><span id="eliminate_subqueries-74"><a href="#eliminate_subqueries-74"><span class="linenos">74</span></a> <span class="k">if</span> <span class="n">scope</span> <span class="ow">is</span> <span class="n">cte_scope</span><span class="p">:</span>
|
||||
</span><span id="eliminate_subqueries-75"><a href="#eliminate_subqueries-75"><span class="linenos">75</span></a> <span class="c1"># Don't try to eliminate this CTE itself</span>
|
||||
</span><span id="eliminate_subqueries-76"><a href="#eliminate_subqueries-76"><span class="linenos">76</span></a> <span class="k">continue</span>
|
||||
</span><span id="eliminate_subqueries-77"><a href="#eliminate_subqueries-77"><span class="linenos">77</span></a> <span class="n">new_cte</span> <span class="o">=</span> <span class="n">_eliminate</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-78"><a href="#eliminate_subqueries-78"><span class="linenos">78</span></a> <span class="k">if</span> <span class="n">new_cte</span><span class="p">:</span>
|
||||
</span><span id="eliminate_subqueries-79"><a href="#eliminate_subqueries-79"><span class="linenos">79</span></a> <span class="n">new_ctes</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">new_cte</span><span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-80"><a href="#eliminate_subqueries-80"><span class="linenos">80</span></a>
|
||||
</span><span id="eliminate_subqueries-81"><a href="#eliminate_subqueries-81"><span class="linenos">81</span></a> <span class="c1"># Append the existing CTE itself</span>
|
||||
</span><span id="eliminate_subqueries-82"><a href="#eliminate_subqueries-82"><span class="linenos">82</span></a> <span class="n">new_ctes</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">cte_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">parent</span><span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-83"><a href="#eliminate_subqueries-83"><span class="linenos">83</span></a>
|
||||
</span><span id="eliminate_subqueries-84"><a href="#eliminate_subqueries-84"><span class="linenos">84</span></a> <span class="c1"># Now append the rest</span>
|
||||
</span><span id="eliminate_subqueries-85"><a href="#eliminate_subqueries-85"><span class="linenos">85</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">itertools</span><span class="o">.</span><span class="n">chain</span><span class="p">(</span><span class="n">root</span><span class="o">.</span><span class="n">union_scopes</span><span class="p">,</span> <span class="n">root</span><span class="o">.</span><span class="n">subquery_scopes</span><span class="p">,</span> <span class="n">root</span><span class="o">.</span><span class="n">table_scopes</span><span class="p">):</span>
|
||||
</span><span id="eliminate_subqueries-86"><a href="#eliminate_subqueries-86"><span class="linenos">86</span></a> <span class="k">for</span> <span class="n">child_scope</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">traverse</span><span class="p">():</span>
|
||||
</span><span id="eliminate_subqueries-87"><a href="#eliminate_subqueries-87"><span class="linenos">87</span></a> <span class="n">new_cte</span> <span class="o">=</span> <span class="n">_eliminate</span><span class="p">(</span><span class="n">child_scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-88"><a href="#eliminate_subqueries-88"><span class="linenos">88</span></a> <span class="k">if</span> <span class="n">new_cte</span><span class="p">:</span>
|
||||
</span><span id="eliminate_subqueries-89"><a href="#eliminate_subqueries-89"><span class="linenos">89</span></a> <span class="n">new_ctes</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">new_cte</span><span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-90"><a href="#eliminate_subqueries-90"><span class="linenos">90</span></a>
|
||||
</span><span id="eliminate_subqueries-91"><a href="#eliminate_subqueries-91"><span class="linenos">91</span></a> <span class="k">if</span> <span class="n">new_ctes</span><span class="p">:</span>
|
||||
</span><span id="eliminate_subqueries-92"><a href="#eliminate_subqueries-92"><span class="linenos">92</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"with"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">With</span><span class="p">(</span><span class="n">expressions</span><span class="o">=</span><span class="n">new_ctes</span><span class="p">,</span> <span class="n">recursive</span><span class="o">=</span><span class="n">recursive</span><span class="p">))</span>
|
||||
</span><span id="eliminate_subqueries-93"><a href="#eliminate_subqueries-93"><span class="linenos">93</span></a>
|
||||
</span><span id="eliminate_subqueries-94"><a href="#eliminate_subqueries-94"><span class="linenos">94</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="eliminate_subqueries-9"><a href="#eliminate_subqueries-9"><span class="linenos"> 9</span></a><span class="k">def</span> <span class="nf">eliminate_subqueries</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="eliminate_subqueries-10"><a href="#eliminate_subqueries-10"><span class="linenos">10</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="eliminate_subqueries-11"><a href="#eliminate_subqueries-11"><span class="linenos">11</span></a><span class="sd"> Rewrite derived tables as CTES, deduplicating if possible.</span>
|
||||
</span><span id="eliminate_subqueries-12"><a href="#eliminate_subqueries-12"><span class="linenos">12</span></a>
|
||||
</span><span id="eliminate_subqueries-13"><a href="#eliminate_subqueries-13"><span class="linenos">13</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="eliminate_subqueries-14"><a href="#eliminate_subqueries-14"><span class="linenos">14</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="eliminate_subqueries-15"><a href="#eliminate_subqueries-15"><span class="linenos">15</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT a FROM (SELECT * FROM x) AS y")</span>
|
||||
</span><span id="eliminate_subqueries-16"><a href="#eliminate_subqueries-16"><span class="linenos">16</span></a><span class="sd"> >>> eliminate_subqueries(expression).sql()</span>
|
||||
</span><span id="eliminate_subqueries-17"><a href="#eliminate_subqueries-17"><span class="linenos">17</span></a><span class="sd"> 'WITH y AS (SELECT * FROM x) SELECT a FROM y AS y'</span>
|
||||
</span><span id="eliminate_subqueries-18"><a href="#eliminate_subqueries-18"><span class="linenos">18</span></a>
|
||||
</span><span id="eliminate_subqueries-19"><a href="#eliminate_subqueries-19"><span class="linenos">19</span></a><span class="sd"> This also deduplicates common subqueries:</span>
|
||||
</span><span id="eliminate_subqueries-20"><a href="#eliminate_subqueries-20"><span class="linenos">20</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT a FROM (SELECT * FROM x) AS y JOIN (SELECT * FROM x) AS z")</span>
|
||||
</span><span id="eliminate_subqueries-21"><a href="#eliminate_subqueries-21"><span class="linenos">21</span></a><span class="sd"> >>> eliminate_subqueries(expression).sql()</span>
|
||||
</span><span id="eliminate_subqueries-22"><a href="#eliminate_subqueries-22"><span class="linenos">22</span></a><span class="sd"> 'WITH y AS (SELECT * FROM x) SELECT a FROM y AS y JOIN y AS z'</span>
|
||||
</span><span id="eliminate_subqueries-23"><a href="#eliminate_subqueries-23"><span class="linenos">23</span></a>
|
||||
</span><span id="eliminate_subqueries-24"><a href="#eliminate_subqueries-24"><span class="linenos">24</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="eliminate_subqueries-25"><a href="#eliminate_subqueries-25"><span class="linenos">25</span></a><span class="sd"> expression (sqlglot.Expression): expression</span>
|
||||
</span><span id="eliminate_subqueries-26"><a href="#eliminate_subqueries-26"><span class="linenos">26</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="eliminate_subqueries-27"><a href="#eliminate_subqueries-27"><span class="linenos">27</span></a><span class="sd"> sqlglot.Expression: expression</span>
|
||||
</span><span id="eliminate_subqueries-28"><a href="#eliminate_subqueries-28"><span class="linenos">28</span></a><span class="sd"> """</span>
|
||||
</span><span id="eliminate_subqueries-29"><a href="#eliminate_subqueries-29"><span class="linenos">29</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Subquery</span><span class="p">):</span>
|
||||
</span><span id="eliminate_subqueries-30"><a href="#eliminate_subqueries-30"><span class="linenos">30</span></a> <span class="c1"># It's possible to have subqueries at the root, e.g. (SELECT * FROM x) LIMIT 1</span>
|
||||
</span><span id="eliminate_subqueries-31"><a href="#eliminate_subqueries-31"><span class="linenos">31</span></a> <span class="n">eliminate_subqueries</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">this</span><span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-32"><a href="#eliminate_subqueries-32"><span class="linenos">32</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="eliminate_subqueries-33"><a href="#eliminate_subqueries-33"><span class="linenos">33</span></a>
|
||||
</span><span id="eliminate_subqueries-34"><a href="#eliminate_subqueries-34"><span class="linenos">34</span></a> <span class="n">root</span> <span class="o">=</span> <span class="n">build_scope</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-35"><a href="#eliminate_subqueries-35"><span class="linenos">35</span></a>
|
||||
</span><span id="eliminate_subqueries-36"><a href="#eliminate_subqueries-36"><span class="linenos">36</span></a> <span class="c1"># Map of alias->Scope|Table</span>
|
||||
</span><span id="eliminate_subqueries-37"><a href="#eliminate_subqueries-37"><span class="linenos">37</span></a> <span class="c1"># These are all aliases that are already used in the expression.</span>
|
||||
</span><span id="eliminate_subqueries-38"><a href="#eliminate_subqueries-38"><span class="linenos">38</span></a> <span class="c1"># We don't want to create new CTEs that conflict with these names.</span>
|
||||
</span><span id="eliminate_subqueries-39"><a href="#eliminate_subqueries-39"><span class="linenos">39</span></a> <span class="n">taken</span> <span class="o">=</span> <span class="p">{}</span>
|
||||
</span><span id="eliminate_subqueries-40"><a href="#eliminate_subqueries-40"><span class="linenos">40</span></a>
|
||||
</span><span id="eliminate_subqueries-41"><a href="#eliminate_subqueries-41"><span class="linenos">41</span></a> <span class="c1"># All CTE aliases in the root scope are taken</span>
|
||||
</span><span id="eliminate_subqueries-42"><a href="#eliminate_subqueries-42"><span class="linenos">42</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">root</span><span class="o">.</span><span class="n">cte_scopes</span><span class="p">:</span>
|
||||
</span><span id="eliminate_subqueries-43"><a href="#eliminate_subqueries-43"><span class="linenos">43</span></a> <span class="n">taken</span><span class="p">[</span><span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">parent</span><span class="o">.</span><span class="n">alias</span><span class="p">]</span> <span class="o">=</span> <span class="n">scope</span>
|
||||
</span><span id="eliminate_subqueries-44"><a href="#eliminate_subqueries-44"><span class="linenos">44</span></a>
|
||||
</span><span id="eliminate_subqueries-45"><a href="#eliminate_subqueries-45"><span class="linenos">45</span></a> <span class="c1"># All table names are taken</span>
|
||||
</span><span id="eliminate_subqueries-46"><a href="#eliminate_subqueries-46"><span class="linenos">46</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">root</span><span class="o">.</span><span class="n">traverse</span><span class="p">():</span>
|
||||
</span><span id="eliminate_subqueries-47"><a href="#eliminate_subqueries-47"><span class="linenos">47</span></a> <span class="n">taken</span><span class="o">.</span><span class="n">update</span><span class="p">(</span>
|
||||
</span><span id="eliminate_subqueries-48"><a href="#eliminate_subqueries-48"><span class="linenos">48</span></a> <span class="p">{</span>
|
||||
</span><span id="eliminate_subqueries-49"><a href="#eliminate_subqueries-49"><span class="linenos">49</span></a> <span class="n">source</span><span class="o">.</span><span class="n">name</span><span class="p">:</span> <span class="n">source</span>
|
||||
</span><span id="eliminate_subqueries-50"><a href="#eliminate_subqueries-50"><span class="linenos">50</span></a> <span class="k">for</span> <span class="n">_</span><span class="p">,</span> <span class="n">source</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">sources</span><span class="o">.</span><span class="n">items</span><span class="p">()</span>
|
||||
</span><span id="eliminate_subqueries-51"><a href="#eliminate_subqueries-51"><span class="linenos">51</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Table</span><span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-52"><a href="#eliminate_subqueries-52"><span class="linenos">52</span></a> <span class="p">}</span>
|
||||
</span><span id="eliminate_subqueries-53"><a href="#eliminate_subqueries-53"><span class="linenos">53</span></a> <span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-54"><a href="#eliminate_subqueries-54"><span class="linenos">54</span></a>
|
||||
</span><span id="eliminate_subqueries-55"><a href="#eliminate_subqueries-55"><span class="linenos">55</span></a> <span class="c1"># Map of Expression->alias</span>
|
||||
</span><span id="eliminate_subqueries-56"><a href="#eliminate_subqueries-56"><span class="linenos">56</span></a> <span class="c1"># Existing CTES in the root expression. We'll use this for deduplication.</span>
|
||||
</span><span id="eliminate_subqueries-57"><a href="#eliminate_subqueries-57"><span class="linenos">57</span></a> <span class="n">existing_ctes</span> <span class="o">=</span> <span class="p">{}</span>
|
||||
</span><span id="eliminate_subqueries-58"><a href="#eliminate_subqueries-58"><span class="linenos">58</span></a>
|
||||
</span><span id="eliminate_subqueries-59"><a href="#eliminate_subqueries-59"><span class="linenos">59</span></a> <span class="n">with_</span> <span class="o">=</span> <span class="n">root</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"with"</span><span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-60"><a href="#eliminate_subqueries-60"><span class="linenos">60</span></a> <span class="n">recursive</span> <span class="o">=</span> <span class="kc">False</span>
|
||||
</span><span id="eliminate_subqueries-61"><a href="#eliminate_subqueries-61"><span class="linenos">61</span></a> <span class="k">if</span> <span class="n">with_</span><span class="p">:</span>
|
||||
</span><span id="eliminate_subqueries-62"><a href="#eliminate_subqueries-62"><span class="linenos">62</span></a> <span class="n">recursive</span> <span class="o">=</span> <span class="n">with_</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"recursive"</span><span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-63"><a href="#eliminate_subqueries-63"><span class="linenos">63</span></a> <span class="k">for</span> <span class="n">cte</span> <span class="ow">in</span> <span class="n">with_</span><span class="o">.</span><span class="n">expressions</span><span class="p">:</span>
|
||||
</span><span id="eliminate_subqueries-64"><a href="#eliminate_subqueries-64"><span class="linenos">64</span></a> <span class="n">existing_ctes</span><span class="p">[</span><span class="n">cte</span><span class="o">.</span><span class="n">this</span><span class="p">]</span> <span class="o">=</span> <span class="n">cte</span><span class="o">.</span><span class="n">alias</span>
|
||||
</span><span id="eliminate_subqueries-65"><a href="#eliminate_subqueries-65"><span class="linenos">65</span></a> <span class="n">new_ctes</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
</span><span id="eliminate_subqueries-66"><a href="#eliminate_subqueries-66"><span class="linenos">66</span></a>
|
||||
</span><span id="eliminate_subqueries-67"><a href="#eliminate_subqueries-67"><span class="linenos">67</span></a> <span class="c1"># We're adding more CTEs, but we want to maintain the DAG order.</span>
|
||||
</span><span id="eliminate_subqueries-68"><a href="#eliminate_subqueries-68"><span class="linenos">68</span></a> <span class="c1"># Derived tables within an existing CTE need to come before the existing CTE.</span>
|
||||
</span><span id="eliminate_subqueries-69"><a href="#eliminate_subqueries-69"><span class="linenos">69</span></a> <span class="k">for</span> <span class="n">cte_scope</span> <span class="ow">in</span> <span class="n">root</span><span class="o">.</span><span class="n">cte_scopes</span><span class="p">:</span>
|
||||
</span><span id="eliminate_subqueries-70"><a href="#eliminate_subqueries-70"><span class="linenos">70</span></a> <span class="c1"># Append all the new CTEs from this existing CTE</span>
|
||||
</span><span id="eliminate_subqueries-71"><a href="#eliminate_subqueries-71"><span class="linenos">71</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">cte_scope</span><span class="o">.</span><span class="n">traverse</span><span class="p">():</span>
|
||||
</span><span id="eliminate_subqueries-72"><a href="#eliminate_subqueries-72"><span class="linenos">72</span></a> <span class="k">if</span> <span class="n">scope</span> <span class="ow">is</span> <span class="n">cte_scope</span><span class="p">:</span>
|
||||
</span><span id="eliminate_subqueries-73"><a href="#eliminate_subqueries-73"><span class="linenos">73</span></a> <span class="c1"># Don't try to eliminate this CTE itself</span>
|
||||
</span><span id="eliminate_subqueries-74"><a href="#eliminate_subqueries-74"><span class="linenos">74</span></a> <span class="k">continue</span>
|
||||
</span><span id="eliminate_subqueries-75"><a href="#eliminate_subqueries-75"><span class="linenos">75</span></a> <span class="n">new_cte</span> <span class="o">=</span> <span class="n">_eliminate</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-76"><a href="#eliminate_subqueries-76"><span class="linenos">76</span></a> <span class="k">if</span> <span class="n">new_cte</span><span class="p">:</span>
|
||||
</span><span id="eliminate_subqueries-77"><a href="#eliminate_subqueries-77"><span class="linenos">77</span></a> <span class="n">new_ctes</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">new_cte</span><span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-78"><a href="#eliminate_subqueries-78"><span class="linenos">78</span></a>
|
||||
</span><span id="eliminate_subqueries-79"><a href="#eliminate_subqueries-79"><span class="linenos">79</span></a> <span class="c1"># Append the existing CTE itself</span>
|
||||
</span><span id="eliminate_subqueries-80"><a href="#eliminate_subqueries-80"><span class="linenos">80</span></a> <span class="n">new_ctes</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">cte_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">parent</span><span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-81"><a href="#eliminate_subqueries-81"><span class="linenos">81</span></a>
|
||||
</span><span id="eliminate_subqueries-82"><a href="#eliminate_subqueries-82"><span class="linenos">82</span></a> <span class="c1"># Now append the rest</span>
|
||||
</span><span id="eliminate_subqueries-83"><a href="#eliminate_subqueries-83"><span class="linenos">83</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">itertools</span><span class="o">.</span><span class="n">chain</span><span class="p">(</span><span class="n">root</span><span class="o">.</span><span class="n">union_scopes</span><span class="p">,</span> <span class="n">root</span><span class="o">.</span><span class="n">subquery_scopes</span><span class="p">,</span> <span class="n">root</span><span class="o">.</span><span class="n">table_scopes</span><span class="p">):</span>
|
||||
</span><span id="eliminate_subqueries-84"><a href="#eliminate_subqueries-84"><span class="linenos">84</span></a> <span class="k">for</span> <span class="n">child_scope</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">traverse</span><span class="p">():</span>
|
||||
</span><span id="eliminate_subqueries-85"><a href="#eliminate_subqueries-85"><span class="linenos">85</span></a> <span class="n">new_cte</span> <span class="o">=</span> <span class="n">_eliminate</span><span class="p">(</span><span class="n">child_scope</span><span class="p">,</span> <span class="n">existing_ctes</span><span class="p">,</span> <span class="n">taken</span><span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-86"><a href="#eliminate_subqueries-86"><span class="linenos">86</span></a> <span class="k">if</span> <span class="n">new_cte</span><span class="p">:</span>
|
||||
</span><span id="eliminate_subqueries-87"><a href="#eliminate_subqueries-87"><span class="linenos">87</span></a> <span class="n">new_ctes</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">new_cte</span><span class="p">)</span>
|
||||
</span><span id="eliminate_subqueries-88"><a href="#eliminate_subqueries-88"><span class="linenos">88</span></a>
|
||||
</span><span id="eliminate_subqueries-89"><a href="#eliminate_subqueries-89"><span class="linenos">89</span></a> <span class="k">if</span> <span class="n">new_ctes</span><span class="p">:</span>
|
||||
</span><span id="eliminate_subqueries-90"><a href="#eliminate_subqueries-90"><span class="linenos">90</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"with"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">With</span><span class="p">(</span><span class="n">expressions</span><span class="o">=</span><span class="n">new_ctes</span><span class="p">,</span> <span class="n">recursive</span><span class="o">=</span><span class="n">recursive</span><span class="p">))</span>
|
||||
</span><span id="eliminate_subqueries-91"><a href="#eliminate_subqueries-91"><span class="linenos">91</span></a>
|
||||
</span><span id="eliminate_subqueries-92"><a href="#eliminate_subqueries-92"><span class="linenos">92</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span></pre></div>
|
||||
|
||||
|
||||
|
|
|
|||
|
|
@ -3,7 +3,7 @@
|
|||
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<title>sqlglot.optimizer.expand_laterals API documentation</title>
|
||||
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||||
<style>/*! * Bootstrap Reboot v5.0.0 (https://getbootstrap.com/) * Copyright 2011-2021 The Bootstrap Authors * Copyright 2011-2021 Twitter, Inc. * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE) * Forked from Normalize.css, licensed MIT (https://github.com/necolas/normalize.css/blob/master/LICENSE.md) */*,::after,::before{box-sizing:border-box}@media (prefers-reduced-motion:no-preference){:root{scroll-behavior:smooth}}body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans","Liberation Sans",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";font-size:1rem;font-weight:400;line-height:1.5;color:#212529;background-color:#fff;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:transparent}hr{margin:1rem 0;color:inherit;background-color:currentColor;border:0;opacity:.25}hr:not([size]){height:1px}h1,h2,h3,h4,h5,h6{margin-top:0;margin-bottom:.5rem;font-weight:500;line-height:1.2}h1{font-size:calc(1.375rem + 1.5vw)}@media (min-width:1200px){h1{font-size:2.5rem}}h2{font-size:calc(1.325rem + .9vw)}@media (min-width:1200px){h2{font-size:2rem}}h3{font-size:calc(1.3rem + .6vw)}@media (min-width:1200px){h3{font-size:1.75rem}}h4{font-size:calc(1.275rem + .3vw)}@media (min-width:1200px){h4{font-size:1.5rem}}h5{font-size:1.25rem}h6{font-size:1rem}p{margin-top:0;margin-bottom:1rem}abbr[data-bs-original-title],abbr[title]{-webkit-text-decoration:underline dotted;text-decoration:underline dotted;cursor:help;-webkit-text-decoration-skip-ink:none;text-decoration-skip-ink:none}address{margin-bottom:1rem;font-style:normal;line-height:inherit}ol,ul{padding-left:2rem}dl,ol,ul{margin-top:0;margin-bottom:1rem}ol ol,ol ul,ul ol,ul ul{margin-bottom:0}dt{font-weight:700}dd{margin-bottom:.5rem;margin-left:0}blockquote{margin:0 0 1rem}b,strong{font-weight:bolder}small{font-size:.875em}mark{padding:.2em;background-color:#fcf8e3}sub,sup{position:relative;font-size:.75em;line-height:0;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}a{color:#0d6efd;text-decoration:underline}a:hover{color:#0a58ca}a:not([href]):not([class]),a:not([href]):not([class]):hover{color:inherit;text-decoration:none}code,kbd,pre,samp{font-family:SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;font-size:1em;direction:ltr;unicode-bidi:bidi-override}pre{display:block;margin-top:0;margin-bottom:1rem;overflow:auto;font-size:.875em}pre code{font-size:inherit;color:inherit;word-break:normal}code{font-size:.875em;color:#d63384;word-wrap:break-word}a>code{color:inherit}kbd{padding:.2rem .4rem;font-size:.875em;color:#fff;background-color:#212529;border-radius:.2rem}kbd kbd{padding:0;font-size:1em;font-weight:700}figure{margin:0 0 1rem}img,svg{vertical-align:middle}table{caption-side:bottom;border-collapse:collapse}caption{padding-top:.5rem;padding-bottom:.5rem;color:#6c757d;text-align:left}th{text-align:inherit;text-align:-webkit-match-parent}tbody,td,tfoot,th,thead,tr{border-color:inherit;border-style:solid;border-width:0}label{display:inline-block}button{border-radius:0}button:focus:not(:focus-visible){outline:0}button,input,optgroup,select,textarea{margin:0;font-family:inherit;font-size:inherit;line-height:inherit}button,select{text-transform:none}[role=button]{cursor:pointer}select{word-wrap:normal}select:disabled{opacity:1}[list]::-webkit-calendar-picker-indicator{display:none}[type=button],[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]:not(:disabled),[type=reset]:not(:disabled),[type=submit]:not(:disabled),button:not(:disabled){cursor:pointer}::-moz-focus-inner{padding:0;border-style:none}textarea{resize:vertical}fieldset{min-width:0;padding:0;margin:0;border:0}legend{float:left;width:100%;padding:0;margin-bottom:.5rem;font-size:calc(1.275rem + .3vw);line-height:inherit}@media (min-width:1200px){legend{font-size:1.5rem}}legend+*{clear:left}::-webkit-datetime-edit-day-field,::-webkit-datetime-edit-fields-wrapper,::-webkit-datetime-edit-hour-field,::-webkit-datetime-edit-minute,::-webkit-datetime-edit-month-field,::-webkit-datetime-edit-text,::-webkit-datetime-edit-year-field{padding:0}::-webkit-inner-spin-button{height:auto}[type=search]{outline-offset:-2px;-webkit-appearance:textfield}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-color-swatch-wrapper{padding:0}::file-selector-button{font:inherit}::-webkit-file-upload-button{font:inherit;-webkit-appearance:button}output{display:inline-block}iframe{border:0}summary{display:list-item;cursor:pointer}progress{vertical-align:baseline}[hidden]{display:none!important}</style>
|
||||
|
|
@ -28,8 +28,8 @@
|
|||
|
||||
|
||||
|
||||
<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
||||
<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
||||
<li>
|
||||
<a class="function" href="#expand_laterals">expand_laterals</a>
|
||||
</li>
|
||||
|
|
|
|||
|
|
@ -3,7 +3,7 @@
|
|||
<head>
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<title>sqlglot.optimizer.expand_multi_table_selects API documentation</title>
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<style>/*! * Bootstrap Reboot v5.0.0 (https://getbootstrap.com/) * Copyright 2011-2021 The Bootstrap Authors * Copyright 2011-2021 Twitter, Inc. * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE) * Forked from Normalize.css, licensed MIT (https://github.com/necolas/normalize.css/blob/master/LICENSE.md) */*,::after,::before{box-sizing:border-box}@media (prefers-reduced-motion:no-preference){:root{scroll-behavior:smooth}}body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans","Liberation Sans",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";font-size:1rem;font-weight:400;line-height:1.5;color:#212529;background-color:#fff;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:transparent}hr{margin:1rem 0;color:inherit;background-color:currentColor;border:0;opacity:.25}hr:not([size]){height:1px}h1,h2,h3,h4,h5,h6{margin-top:0;margin-bottom:.5rem;font-weight:500;line-height:1.2}h1{font-size:calc(1.375rem + 1.5vw)}@media (min-width:1200px){h1{font-size:2.5rem}}h2{font-size:calc(1.325rem + .9vw)}@media (min-width:1200px){h2{font-size:2rem}}h3{font-size:calc(1.3rem + .6vw)}@media (min-width:1200px){h3{font-size:1.75rem}}h4{font-size:calc(1.275rem + .3vw)}@media (min-width:1200px){h4{font-size:1.5rem}}h5{font-size:1.25rem}h6{font-size:1rem}p{margin-top:0;margin-bottom:1rem}abbr[data-bs-original-title],abbr[title]{-webkit-text-decoration:underline dotted;text-decoration:underline dotted;cursor:help;-webkit-text-decoration-skip-ink:none;text-decoration-skip-ink:none}address{margin-bottom:1rem;font-style:normal;line-height:inherit}ol,ul{padding-left:2rem}dl,ol,ul{margin-top:0;margin-bottom:1rem}ol ol,ol ul,ul ol,ul ul{margin-bottom:0}dt{font-weight:700}dd{margin-bottom:.5rem;margin-left:0}blockquote{margin:0 0 1rem}b,strong{font-weight:bolder}small{font-size:.875em}mark{padding:.2em;background-color:#fcf8e3}sub,sup{position:relative;font-size:.75em;line-height:0;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}a{color:#0d6efd;text-decoration:underline}a:hover{color:#0a58ca}a:not([href]):not([class]),a:not([href]):not([class]):hover{color:inherit;text-decoration:none}code,kbd,pre,samp{font-family:SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;font-size:1em;direction:ltr;unicode-bidi:bidi-override}pre{display:block;margin-top:0;margin-bottom:1rem;overflow:auto;font-size:.875em}pre code{font-size:inherit;color:inherit;word-break:normal}code{font-size:.875em;color:#d63384;word-wrap:break-word}a>code{color:inherit}kbd{padding:.2rem .4rem;font-size:.875em;color:#fff;background-color:#212529;border-radius:.2rem}kbd kbd{padding:0;font-size:1em;font-weight:700}figure{margin:0 0 1rem}img,svg{vertical-align:middle}table{caption-side:bottom;border-collapse:collapse}caption{padding-top:.5rem;padding-bottom:.5rem;color:#6c757d;text-align:left}th{text-align:inherit;text-align:-webkit-match-parent}tbody,td,tfoot,th,thead,tr{border-color:inherit;border-style:solid;border-width:0}label{display:inline-block}button{border-radius:0}button:focus:not(:focus-visible){outline:0}button,input,optgroup,select,textarea{margin:0;font-family:inherit;font-size:inherit;line-height:inherit}button,select{text-transform:none}[role=button]{cursor:pointer}select{word-wrap:normal}select:disabled{opacity:1}[list]::-webkit-calendar-picker-indicator{display:none}[type=button],[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]:not(:disabled),[type=reset]:not(:disabled),[type=submit]:not(:disabled),button:not(:disabled){cursor:pointer}::-moz-focus-inner{padding:0;border-style:none}textarea{resize:vertical}fieldset{min-width:0;padding:0;margin:0;border:0}legend{float:left;width:100%;padding:0;margin-bottom:.5rem;font-size:calc(1.275rem + .3vw);line-height:inherit}@media (min-width:1200px){legend{font-size:1.5rem}}legend+*{clear:left}::-webkit-datetime-edit-day-field,::-webkit-datetime-edit-fields-wrapper,::-webkit-datetime-edit-hour-field,::-webkit-datetime-edit-minute,::-webkit-datetime-edit-month-field,::-webkit-datetime-edit-text,::-webkit-datetime-edit-year-field{padding:0}::-webkit-inner-spin-button{height:auto}[type=search]{outline-offset:-2px;-webkit-appearance:textfield}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-color-swatch-wrapper{padding:0}::file-selector-button{font:inherit}::-webkit-file-upload-button{font:inherit;-webkit-appearance:button}output{display:inline-block}iframe{border:0}summary{display:list-item;cursor:pointer}progress{vertical-align:baseline}[hidden]{display:none!important}</style>
|
||||
|
|
@ -28,8 +28,8 @@
|
|||
|
||||
|
||||
|
||||
<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
||||
<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
||||
<li>
|
||||
<a class="function" href="#expand_multi_table_selects">expand_multi_table_selects</a>
|
||||
</li>
|
||||
|
|
|
|||
|
|
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|
|||
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<h2>API Documentation</h2>
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<h2>API Documentation</h2>
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<ul class="memberlist">
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<li>
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<a class="function" href="#isolate_table_selects">isolate_table_selects</a>
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<title>sqlglot.optimizer.lower_identities API documentation</title>
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<style>/*! * Bootstrap Reboot v5.0.0 (https://getbootstrap.com/) * Copyright 2011-2021 The Bootstrap Authors * Copyright 2011-2021 Twitter, Inc. * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE) * Forked from Normalize.css, licensed MIT (https://github.com/necolas/normalize.css/blob/master/LICENSE.md) */*,::after,::before{box-sizing:border-box}@media (prefers-reduced-motion:no-preference){:root{scroll-behavior:smooth}}body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans","Liberation Sans",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";font-size:1rem;font-weight:400;line-height:1.5;color:#212529;background-color:#fff;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:transparent}hr{margin:1rem 0;color:inherit;background-color:currentColor;border:0;opacity:.25}hr:not([size]){height:1px}h1,h2,h3,h4,h5,h6{margin-top:0;margin-bottom:.5rem;font-weight:500;line-height:1.2}h1{font-size:calc(1.375rem + 1.5vw)}@media (min-width:1200px){h1{font-size:2.5rem}}h2{font-size:calc(1.325rem + .9vw)}@media (min-width:1200px){h2{font-size:2rem}}h3{font-size:calc(1.3rem + .6vw)}@media (min-width:1200px){h3{font-size:1.75rem}}h4{font-size:calc(1.275rem + .3vw)}@media (min-width:1200px){h4{font-size:1.5rem}}h5{font-size:1.25rem}h6{font-size:1rem}p{margin-top:0;margin-bottom:1rem}abbr[data-bs-original-title],abbr[title]{-webkit-text-decoration:underline dotted;text-decoration:underline dotted;cursor:help;-webkit-text-decoration-skip-ink:none;text-decoration-skip-ink:none}address{margin-bottom:1rem;font-style:normal;line-height:inherit}ol,ul{padding-left:2rem}dl,ol,ul{margin-top:0;margin-bottom:1rem}ol ol,ol ul,ul ol,ul ul{margin-bottom:0}dt{font-weight:700}dd{margin-bottom:.5rem;margin-left:0}blockquote{margin:0 0 1rem}b,strong{font-weight:bolder}small{font-size:.875em}mark{padding:.2em;background-color:#fcf8e3}sub,sup{position:relative;font-size:.75em;line-height:0;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}a{color:#0d6efd;text-decoration:underline}a:hover{color:#0a58ca}a:not([href]):not([class]),a:not([href]):not([class]):hover{color:inherit;text-decoration:none}code,kbd,pre,samp{font-family:SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;font-size:1em;direction:ltr;unicode-bidi:bidi-override}pre{display:block;margin-top:0;margin-bottom:1rem;overflow:auto;font-size:.875em}pre code{font-size:inherit;color:inherit;word-break:normal}code{font-size:.875em;color:#d63384;word-wrap:break-word}a>code{color:inherit}kbd{padding:.2rem .4rem;font-size:.875em;color:#fff;background-color:#212529;border-radius:.2rem}kbd kbd{padding:0;font-size:1em;font-weight:700}figure{margin:0 0 1rem}img,svg{vertical-align:middle}table{caption-side:bottom;border-collapse:collapse}caption{padding-top:.5rem;padding-bottom:.5rem;color:#6c757d;text-align:left}th{text-align:inherit;text-align:-webkit-match-parent}tbody,td,tfoot,th,thead,tr{border-color:inherit;border-style:solid;border-width:0}label{display:inline-block}button{border-radius:0}button:focus:not(:focus-visible){outline:0}button,input,optgroup,select,textarea{margin:0;font-family:inherit;font-size:inherit;line-height:inherit}button,select{text-transform:none}[role=button]{cursor:pointer}select{word-wrap:normal}select:disabled{opacity:1}[list]::-webkit-calendar-picker-indicator{display:none}[type=button],[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]:not(:disabled),[type=reset]:not(:disabled),[type=submit]:not(:disabled),button:not(:disabled){cursor:pointer}::-moz-focus-inner{padding:0;border-style:none}textarea{resize:vertical}fieldset{min-width:0;padding:0;margin:0;border:0}legend{float:left;width:100%;padding:0;margin-bottom:.5rem;font-size:calc(1.275rem + .3vw);line-height:inherit}@media (min-width:1200px){legend{font-size:1.5rem}}legend+*{clear:left}::-webkit-datetime-edit-day-field,::-webkit-datetime-edit-fields-wrapper,::-webkit-datetime-edit-hour-field,::-webkit-datetime-edit-minute,::-webkit-datetime-edit-month-field,::-webkit-datetime-edit-text,::-webkit-datetime-edit-year-field{padding:0}::-webkit-inner-spin-button{height:auto}[type=search]{outline-offset:-2px;-webkit-appearance:textfield}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-color-swatch-wrapper{padding:0}::file-selector-button{font:inherit}::-webkit-file-upload-button{font:inherit;-webkit-appearance:button}output{display:inline-block}iframe{border:0}summary{display:list-item;cursor:pointer}progress{vertical-align:baseline}[hidden]{display:none!important}</style>
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<h2>API Documentation</h2>
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<ul class="memberlist">
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<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
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<li>
|
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<a class="function" href="#lower_identities">lower_identities</a>
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</li>
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@ -57,97 +57,93 @@
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<label class="view-source-button" for="mod-lower_identities-view-source"><span>View Source</span></label>
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<div class="pdoc-code codehilite"><pre><span></span><span id="L-1"><a href="#L-1"><span class="linenos"> 1</span></a><span class="kn">from</span> <span class="nn">sqlglot</span> <span class="kn">import</span> <span class="n">exp</span>
|
||||
</span><span id="L-2"><a href="#L-2"><span class="linenos"> 2</span></a><span class="kn">from</span> <span class="nn">sqlglot.helper</span> <span class="kn">import</span> <span class="n">ensure_collection</span>
|
||||
</span><span id="L-2"><a href="#L-2"><span class="linenos"> 2</span></a>
|
||||
</span><span id="L-3"><a href="#L-3"><span class="linenos"> 3</span></a>
|
||||
</span><span id="L-4"><a href="#L-4"><span class="linenos"> 4</span></a>
|
||||
</span><span id="L-5"><a href="#L-5"><span class="linenos"> 5</span></a><span class="k">def</span> <span class="nf">lower_identities</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="L-6"><a href="#L-6"><span class="linenos"> 6</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-7"><a href="#L-7"><span class="linenos"> 7</span></a><span class="sd"> Convert all unquoted identifiers to lower case.</span>
|
||||
</span><span id="L-8"><a href="#L-8"><span class="linenos"> 8</span></a>
|
||||
</span><span id="L-9"><a href="#L-9"><span class="linenos"> 9</span></a><span class="sd"> Assuming the schema is all lower case, this essentially makes identifiers case-insensitive.</span>
|
||||
</span><span id="L-10"><a href="#L-10"><span class="linenos">10</span></a>
|
||||
</span><span id="L-11"><a href="#L-11"><span class="linenos">11</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="L-12"><a href="#L-12"><span class="linenos">12</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="L-13"><a href="#L-13"><span class="linenos">13</span></a><span class="sd"> >>> expression = sqlglot.parse_one('SELECT Bar.A AS A FROM "Foo".Bar')</span>
|
||||
</span><span id="L-14"><a href="#L-14"><span class="linenos">14</span></a><span class="sd"> >>> lower_identities(expression).sql()</span>
|
||||
</span><span id="L-15"><a href="#L-15"><span class="linenos">15</span></a><span class="sd"> 'SELECT bar.a AS A FROM "Foo".bar'</span>
|
||||
</span><span id="L-16"><a href="#L-16"><span class="linenos">16</span></a>
|
||||
</span><span id="L-17"><a href="#L-17"><span class="linenos">17</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-18"><a href="#L-18"><span class="linenos">18</span></a><span class="sd"> expression (sqlglot.Expression): expression to quote</span>
|
||||
</span><span id="L-19"><a href="#L-19"><span class="linenos">19</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="L-20"><a href="#L-20"><span class="linenos">20</span></a><span class="sd"> sqlglot.Expression: quoted expression</span>
|
||||
</span><span id="L-21"><a href="#L-21"><span class="linenos">21</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-22"><a href="#L-22"><span class="linenos">22</span></a> <span class="c1"># We need to leave the output aliases unchanged, so the selects need special handling</span>
|
||||
</span><span id="L-23"><a href="#L-23"><span class="linenos">23</span></a> <span class="n">_lower_selects</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="L-24"><a href="#L-24"><span class="linenos">24</span></a>
|
||||
</span><span id="L-25"><a href="#L-25"><span class="linenos">25</span></a> <span class="c1"># These clauses can reference output aliases and also need special handling</span>
|
||||
</span><span id="L-26"><a href="#L-26"><span class="linenos">26</span></a> <span class="n">_lower_order</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="L-27"><a href="#L-27"><span class="linenos">27</span></a> <span class="n">_lower_having</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="L-28"><a href="#L-28"><span class="linenos">28</span></a>
|
||||
</span><span id="L-29"><a href="#L-29"><span class="linenos">29</span></a> <span class="c1"># We've already handled these args, so don't traverse into them</span>
|
||||
</span><span id="L-30"><a href="#L-30"><span class="linenos">30</span></a> <span class="n">traversed</span> <span class="o">=</span> <span class="p">{</span><span class="s2">"expressions"</span><span class="p">,</span> <span class="s2">"order"</span><span class="p">,</span> <span class="s2">"having"</span><span class="p">}</span>
|
||||
</span><span id="L-31"><a href="#L-31"><span class="linenos">31</span></a>
|
||||
</span><span id="L-32"><a href="#L-32"><span class="linenos">32</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Subquery</span><span class="p">):</span>
|
||||
</span><span id="L-33"><a href="#L-33"><span class="linenos">33</span></a> <span class="c1"># Root subquery, e.g. (SELECT A AS A FROM X) LIMIT 1</span>
|
||||
</span><span id="L-34"><a href="#L-34"><span class="linenos">34</span></a> <span class="n">lower_identities</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">this</span><span class="p">)</span>
|
||||
</span><span id="L-35"><a href="#L-35"><span class="linenos">35</span></a> <span class="n">traversed</span> <span class="o">|=</span> <span class="p">{</span><span class="s2">"this"</span><span class="p">}</span>
|
||||
</span><span id="L-36"><a href="#L-36"><span class="linenos">36</span></a>
|
||||
</span><span id="L-37"><a href="#L-37"><span class="linenos">37</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Union</span><span class="p">):</span>
|
||||
</span><span id="L-38"><a href="#L-38"><span class="linenos">38</span></a> <span class="c1"># Union, e.g. SELECT A AS A FROM X UNION SELECT A AS A FROM X</span>
|
||||
</span><span id="L-39"><a href="#L-39"><span class="linenos">39</span></a> <span class="n">lower_identities</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">left</span><span class="p">)</span>
|
||||
</span><span id="L-40"><a href="#L-40"><span class="linenos">40</span></a> <span class="n">lower_identities</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">right</span><span class="p">)</span>
|
||||
</span><span id="L-41"><a href="#L-41"><span class="linenos">41</span></a> <span class="n">traversed</span> <span class="o">|=</span> <span class="p">{</span><span class="s2">"this"</span><span class="p">,</span> <span class="s2">"expression"</span><span class="p">}</span>
|
||||
</span><span id="L-42"><a href="#L-42"><span class="linenos">42</span></a>
|
||||
</span><span id="L-43"><a href="#L-43"><span class="linenos">43</span></a> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
|
||||
</span><span id="L-44"><a href="#L-44"><span class="linenos">44</span></a> <span class="k">if</span> <span class="n">k</span> <span class="ow">in</span> <span class="n">traversed</span><span class="p">:</span>
|
||||
</span><span id="L-45"><a href="#L-45"><span class="linenos">45</span></a> <span class="k">continue</span>
|
||||
</span><span id="L-4"><a href="#L-4"><span class="linenos"> 4</span></a><span class="k">def</span> <span class="nf">lower_identities</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="L-5"><a href="#L-5"><span class="linenos"> 5</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-6"><a href="#L-6"><span class="linenos"> 6</span></a><span class="sd"> Convert all unquoted identifiers to lower case.</span>
|
||||
</span><span id="L-7"><a href="#L-7"><span class="linenos"> 7</span></a>
|
||||
</span><span id="L-8"><a href="#L-8"><span class="linenos"> 8</span></a><span class="sd"> Assuming the schema is all lower case, this essentially makes identifiers case-insensitive.</span>
|
||||
</span><span id="L-9"><a href="#L-9"><span class="linenos"> 9</span></a>
|
||||
</span><span id="L-10"><a href="#L-10"><span class="linenos">10</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="L-11"><a href="#L-11"><span class="linenos">11</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="L-12"><a href="#L-12"><span class="linenos">12</span></a><span class="sd"> >>> expression = sqlglot.parse_one('SELECT Bar.A AS A FROM "Foo".Bar')</span>
|
||||
</span><span id="L-13"><a href="#L-13"><span class="linenos">13</span></a><span class="sd"> >>> lower_identities(expression).sql()</span>
|
||||
</span><span id="L-14"><a href="#L-14"><span class="linenos">14</span></a><span class="sd"> 'SELECT bar.a AS A FROM "Foo".bar'</span>
|
||||
</span><span id="L-15"><a href="#L-15"><span class="linenos">15</span></a>
|
||||
</span><span id="L-16"><a href="#L-16"><span class="linenos">16</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-17"><a href="#L-17"><span class="linenos">17</span></a><span class="sd"> expression (sqlglot.Expression): expression to quote</span>
|
||||
</span><span id="L-18"><a href="#L-18"><span class="linenos">18</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="L-19"><a href="#L-19"><span class="linenos">19</span></a><span class="sd"> sqlglot.Expression: quoted expression</span>
|
||||
</span><span id="L-20"><a href="#L-20"><span class="linenos">20</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-21"><a href="#L-21"><span class="linenos">21</span></a> <span class="c1"># We need to leave the output aliases unchanged, so the selects need special handling</span>
|
||||
</span><span id="L-22"><a href="#L-22"><span class="linenos">22</span></a> <span class="n">_lower_selects</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="L-23"><a href="#L-23"><span class="linenos">23</span></a>
|
||||
</span><span id="L-24"><a href="#L-24"><span class="linenos">24</span></a> <span class="c1"># These clauses can reference output aliases and also need special handling</span>
|
||||
</span><span id="L-25"><a href="#L-25"><span class="linenos">25</span></a> <span class="n">_lower_order</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="L-26"><a href="#L-26"><span class="linenos">26</span></a> <span class="n">_lower_having</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="L-27"><a href="#L-27"><span class="linenos">27</span></a>
|
||||
</span><span id="L-28"><a href="#L-28"><span class="linenos">28</span></a> <span class="c1"># We've already handled these args, so don't traverse into them</span>
|
||||
</span><span id="L-29"><a href="#L-29"><span class="linenos">29</span></a> <span class="n">traversed</span> <span class="o">=</span> <span class="p">{</span><span class="s2">"expressions"</span><span class="p">,</span> <span class="s2">"order"</span><span class="p">,</span> <span class="s2">"having"</span><span class="p">}</span>
|
||||
</span><span id="L-30"><a href="#L-30"><span class="linenos">30</span></a>
|
||||
</span><span id="L-31"><a href="#L-31"><span class="linenos">31</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Subquery</span><span class="p">):</span>
|
||||
</span><span id="L-32"><a href="#L-32"><span class="linenos">32</span></a> <span class="c1"># Root subquery, e.g. (SELECT A AS A FROM X) LIMIT 1</span>
|
||||
</span><span id="L-33"><a href="#L-33"><span class="linenos">33</span></a> <span class="n">lower_identities</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">this</span><span class="p">)</span>
|
||||
</span><span id="L-34"><a href="#L-34"><span class="linenos">34</span></a> <span class="n">traversed</span> <span class="o">|=</span> <span class="p">{</span><span class="s2">"this"</span><span class="p">}</span>
|
||||
</span><span id="L-35"><a href="#L-35"><span class="linenos">35</span></a>
|
||||
</span><span id="L-36"><a href="#L-36"><span class="linenos">36</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Union</span><span class="p">):</span>
|
||||
</span><span id="L-37"><a href="#L-37"><span class="linenos">37</span></a> <span class="c1"># Union, e.g. SELECT A AS A FROM X UNION SELECT A AS A FROM X</span>
|
||||
</span><span id="L-38"><a href="#L-38"><span class="linenos">38</span></a> <span class="n">lower_identities</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">left</span><span class="p">)</span>
|
||||
</span><span id="L-39"><a href="#L-39"><span class="linenos">39</span></a> <span class="n">lower_identities</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">right</span><span class="p">)</span>
|
||||
</span><span id="L-40"><a href="#L-40"><span class="linenos">40</span></a> <span class="n">traversed</span> <span class="o">|=</span> <span class="p">{</span><span class="s2">"this"</span><span class="p">,</span> <span class="s2">"expression"</span><span class="p">}</span>
|
||||
</span><span id="L-41"><a href="#L-41"><span class="linenos">41</span></a>
|
||||
</span><span id="L-42"><a href="#L-42"><span class="linenos">42</span></a> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">iter_expressions</span><span class="p">():</span>
|
||||
</span><span id="L-43"><a href="#L-43"><span class="linenos">43</span></a> <span class="k">if</span> <span class="n">k</span> <span class="ow">in</span> <span class="n">traversed</span><span class="p">:</span>
|
||||
</span><span id="L-44"><a href="#L-44"><span class="linenos">44</span></a> <span class="k">continue</span>
|
||||
</span><span id="L-45"><a href="#L-45"><span class="linenos">45</span></a> <span class="n">v</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span><span class="n">_lower</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
|
||||
</span><span id="L-46"><a href="#L-46"><span class="linenos">46</span></a>
|
||||
</span><span id="L-47"><a href="#L-47"><span class="linenos">47</span></a> <span class="k">for</span> <span class="n">child</span> <span class="ow">in</span> <span class="n">ensure_collection</span><span class="p">(</span><span class="n">v</span><span class="p">):</span>
|
||||
</span><span id="L-48"><a href="#L-48"><span class="linenos">48</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">child</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">):</span>
|
||||
</span><span id="L-49"><a href="#L-49"><span class="linenos">49</span></a> <span class="n">child</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span><span class="n">_lower</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
|
||||
</span><span id="L-50"><a href="#L-50"><span class="linenos">50</span></a>
|
||||
</span><span id="L-51"><a href="#L-51"><span class="linenos">51</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-52"><a href="#L-52"><span class="linenos">52</span></a>
|
||||
</span><span id="L-53"><a href="#L-53"><span class="linenos">53</span></a>
|
||||
</span><span id="L-54"><a href="#L-54"><span class="linenos">54</span></a><span class="k">def</span> <span class="nf">_lower_selects</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="L-55"><a href="#L-55"><span class="linenos">55</span></a> <span class="k">for</span> <span class="n">e</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">expressions</span><span class="p">:</span>
|
||||
</span><span id="L-56"><a href="#L-56"><span class="linenos">56</span></a> <span class="c1"># Leave output aliases as-is</span>
|
||||
</span><span id="L-57"><a href="#L-57"><span class="linenos">57</span></a> <span class="n">e</span><span class="o">.</span><span class="n">unalias</span><span class="p">()</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span><span class="n">_lower</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
|
||||
</span><span id="L-47"><a href="#L-47"><span class="linenos">47</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-48"><a href="#L-48"><span class="linenos">48</span></a>
|
||||
</span><span id="L-49"><a href="#L-49"><span class="linenos">49</span></a>
|
||||
</span><span id="L-50"><a href="#L-50"><span class="linenos">50</span></a><span class="k">def</span> <span class="nf">_lower_selects</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="L-51"><a href="#L-51"><span class="linenos">51</span></a> <span class="k">for</span> <span class="n">e</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">expressions</span><span class="p">:</span>
|
||||
</span><span id="L-52"><a href="#L-52"><span class="linenos">52</span></a> <span class="c1"># Leave output aliases as-is</span>
|
||||
</span><span id="L-53"><a href="#L-53"><span class="linenos">53</span></a> <span class="n">e</span><span class="o">.</span><span class="n">unalias</span><span class="p">()</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span><span class="n">_lower</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
|
||||
</span><span id="L-54"><a href="#L-54"><span class="linenos">54</span></a>
|
||||
</span><span id="L-55"><a href="#L-55"><span class="linenos">55</span></a>
|
||||
</span><span id="L-56"><a href="#L-56"><span class="linenos">56</span></a><span class="k">def</span> <span class="nf">_lower_order</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="L-57"><a href="#L-57"><span class="linenos">57</span></a> <span class="n">order</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"order"</span><span class="p">)</span>
|
||||
</span><span id="L-58"><a href="#L-58"><span class="linenos">58</span></a>
|
||||
</span><span id="L-59"><a href="#L-59"><span class="linenos">59</span></a>
|
||||
</span><span id="L-60"><a href="#L-60"><span class="linenos">60</span></a><span class="k">def</span> <span class="nf">_lower_order</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="L-61"><a href="#L-61"><span class="linenos">61</span></a> <span class="n">order</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"order"</span><span class="p">)</span>
|
||||
</span><span id="L-62"><a href="#L-62"><span class="linenos">62</span></a>
|
||||
</span><span id="L-63"><a href="#L-63"><span class="linenos">63</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">order</span><span class="p">:</span>
|
||||
</span><span id="L-64"><a href="#L-64"><span class="linenos">64</span></a> <span class="k">return</span>
|
||||
</span><span id="L-65"><a href="#L-65"><span class="linenos">65</span></a>
|
||||
</span><span id="L-66"><a href="#L-66"><span class="linenos">66</span></a> <span class="n">output_aliases</span> <span class="o">=</span> <span class="p">{</span><span class="n">e</span><span class="o">.</span><span class="n">alias</span> <span class="k">for</span> <span class="n">e</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">expressions</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">e</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Alias</span><span class="p">)}</span>
|
||||
</span><span id="L-67"><a href="#L-67"><span class="linenos">67</span></a>
|
||||
</span><span id="L-68"><a href="#L-68"><span class="linenos">68</span></a> <span class="k">for</span> <span class="n">ordered</span> <span class="ow">in</span> <span class="n">order</span><span class="o">.</span><span class="n">expressions</span><span class="p">:</span>
|
||||
</span><span id="L-69"><a href="#L-69"><span class="linenos">69</span></a> <span class="c1"># Don't lower references to output aliases</span>
|
||||
</span><span id="L-70"><a href="#L-70"><span class="linenos">70</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="p">(</span>
|
||||
</span><span id="L-71"><a href="#L-71"><span class="linenos">71</span></a> <span class="nb">isinstance</span><span class="p">(</span><span class="n">ordered</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">)</span>
|
||||
</span><span id="L-72"><a href="#L-72"><span class="linenos">72</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="n">ordered</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">table</span>
|
||||
</span><span id="L-73"><a href="#L-73"><span class="linenos">73</span></a> <span class="ow">and</span> <span class="n">ordered</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">name</span> <span class="ow">in</span> <span class="n">output_aliases</span>
|
||||
</span><span id="L-74"><a href="#L-74"><span class="linenos">74</span></a> <span class="p">):</span>
|
||||
</span><span id="L-75"><a href="#L-75"><span class="linenos">75</span></a> <span class="n">ordered</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span><span class="n">_lower</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
|
||||
</span><span id="L-59"><a href="#L-59"><span class="linenos">59</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">order</span><span class="p">:</span>
|
||||
</span><span id="L-60"><a href="#L-60"><span class="linenos">60</span></a> <span class="k">return</span>
|
||||
</span><span id="L-61"><a href="#L-61"><span class="linenos">61</span></a>
|
||||
</span><span id="L-62"><a href="#L-62"><span class="linenos">62</span></a> <span class="n">output_aliases</span> <span class="o">=</span> <span class="p">{</span><span class="n">e</span><span class="o">.</span><span class="n">alias</span> <span class="k">for</span> <span class="n">e</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">expressions</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">e</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Alias</span><span class="p">)}</span>
|
||||
</span><span id="L-63"><a href="#L-63"><span class="linenos">63</span></a>
|
||||
</span><span id="L-64"><a href="#L-64"><span class="linenos">64</span></a> <span class="k">for</span> <span class="n">ordered</span> <span class="ow">in</span> <span class="n">order</span><span class="o">.</span><span class="n">expressions</span><span class="p">:</span>
|
||||
</span><span id="L-65"><a href="#L-65"><span class="linenos">65</span></a> <span class="c1"># Don't lower references to output aliases</span>
|
||||
</span><span id="L-66"><a href="#L-66"><span class="linenos">66</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="p">(</span>
|
||||
</span><span id="L-67"><a href="#L-67"><span class="linenos">67</span></a> <span class="nb">isinstance</span><span class="p">(</span><span class="n">ordered</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">)</span>
|
||||
</span><span id="L-68"><a href="#L-68"><span class="linenos">68</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="n">ordered</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">table</span>
|
||||
</span><span id="L-69"><a href="#L-69"><span class="linenos">69</span></a> <span class="ow">and</span> <span class="n">ordered</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">name</span> <span class="ow">in</span> <span class="n">output_aliases</span>
|
||||
</span><span id="L-70"><a href="#L-70"><span class="linenos">70</span></a> <span class="p">):</span>
|
||||
</span><span id="L-71"><a href="#L-71"><span class="linenos">71</span></a> <span class="n">ordered</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span><span class="n">_lower</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
|
||||
</span><span id="L-72"><a href="#L-72"><span class="linenos">72</span></a>
|
||||
</span><span id="L-73"><a href="#L-73"><span class="linenos">73</span></a>
|
||||
</span><span id="L-74"><a href="#L-74"><span class="linenos">74</span></a><span class="k">def</span> <span class="nf">_lower_having</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="L-75"><a href="#L-75"><span class="linenos">75</span></a> <span class="n">having</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"having"</span><span class="p">)</span>
|
||||
</span><span id="L-76"><a href="#L-76"><span class="linenos">76</span></a>
|
||||
</span><span id="L-77"><a href="#L-77"><span class="linenos">77</span></a>
|
||||
</span><span id="L-78"><a href="#L-78"><span class="linenos">78</span></a><span class="k">def</span> <span class="nf">_lower_having</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="L-79"><a href="#L-79"><span class="linenos">79</span></a> <span class="n">having</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"having"</span><span class="p">)</span>
|
||||
</span><span id="L-80"><a href="#L-80"><span class="linenos">80</span></a>
|
||||
</span><span id="L-81"><a href="#L-81"><span class="linenos">81</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">having</span><span class="p">:</span>
|
||||
</span><span id="L-82"><a href="#L-82"><span class="linenos">82</span></a> <span class="k">return</span>
|
||||
</span><span id="L-77"><a href="#L-77"><span class="linenos">77</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">having</span><span class="p">:</span>
|
||||
</span><span id="L-78"><a href="#L-78"><span class="linenos">78</span></a> <span class="k">return</span>
|
||||
</span><span id="L-79"><a href="#L-79"><span class="linenos">79</span></a>
|
||||
</span><span id="L-80"><a href="#L-80"><span class="linenos">80</span></a> <span class="c1"># Don't lower references to output aliases</span>
|
||||
</span><span id="L-81"><a href="#L-81"><span class="linenos">81</span></a> <span class="k">for</span> <span class="n">agg</span> <span class="ow">in</span> <span class="n">having</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">AggFunc</span><span class="p">):</span>
|
||||
</span><span id="L-82"><a href="#L-82"><span class="linenos">82</span></a> <span class="n">agg</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span><span class="n">_lower</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
|
||||
</span><span id="L-83"><a href="#L-83"><span class="linenos">83</span></a>
|
||||
</span><span id="L-84"><a href="#L-84"><span class="linenos">84</span></a> <span class="c1"># Don't lower references to output aliases</span>
|
||||
</span><span id="L-85"><a href="#L-85"><span class="linenos">85</span></a> <span class="k">for</span> <span class="n">agg</span> <span class="ow">in</span> <span class="n">having</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">AggFunc</span><span class="p">):</span>
|
||||
</span><span id="L-86"><a href="#L-86"><span class="linenos">86</span></a> <span class="n">agg</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span><span class="n">_lower</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
|
||||
</span><span id="L-87"><a href="#L-87"><span class="linenos">87</span></a>
|
||||
</span><span id="L-88"><a href="#L-88"><span class="linenos">88</span></a>
|
||||
</span><span id="L-89"><a href="#L-89"><span class="linenos">89</span></a><span class="k">def</span> <span class="nf">_lower</span><span class="p">(</span><span class="n">node</span><span class="p">):</span>
|
||||
</span><span id="L-90"><a href="#L-90"><span class="linenos">90</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Identifier</span><span class="p">)</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">node</span><span class="o">.</span><span class="n">quoted</span><span class="p">:</span>
|
||||
</span><span id="L-91"><a href="#L-91"><span class="linenos">91</span></a> <span class="n">node</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"this"</span><span class="p">,</span> <span class="n">node</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">lower</span><span class="p">())</span>
|
||||
</span><span id="L-92"><a href="#L-92"><span class="linenos">92</span></a> <span class="k">return</span> <span class="n">node</span>
|
||||
</span><span id="L-84"><a href="#L-84"><span class="linenos">84</span></a>
|
||||
</span><span id="L-85"><a href="#L-85"><span class="linenos">85</span></a><span class="k">def</span> <span class="nf">_lower</span><span class="p">(</span><span class="n">node</span><span class="p">):</span>
|
||||
</span><span id="L-86"><a href="#L-86"><span class="linenos">86</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Identifier</span><span class="p">)</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">node</span><span class="o">.</span><span class="n">quoted</span><span class="p">:</span>
|
||||
</span><span id="L-87"><a href="#L-87"><span class="linenos">87</span></a> <span class="n">node</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"this"</span><span class="p">,</span> <span class="n">node</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">lower</span><span class="p">())</span>
|
||||
</span><span id="L-88"><a href="#L-88"><span class="linenos">88</span></a> <span class="k">return</span> <span class="n">node</span>
|
||||
</span></pre></div>
|
||||
|
||||
|
||||
|
|
@ -163,53 +159,50 @@
|
|||
|
||||
</div>
|
||||
<a class="headerlink" href="#lower_identities"></a>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="lower_identities-6"><a href="#lower_identities-6"><span class="linenos"> 6</span></a><span class="k">def</span> <span class="nf">lower_identities</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="lower_identities-7"><a href="#lower_identities-7"><span class="linenos"> 7</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="lower_identities-8"><a href="#lower_identities-8"><span class="linenos"> 8</span></a><span class="sd"> Convert all unquoted identifiers to lower case.</span>
|
||||
</span><span id="lower_identities-9"><a href="#lower_identities-9"><span class="linenos"> 9</span></a>
|
||||
</span><span id="lower_identities-10"><a href="#lower_identities-10"><span class="linenos">10</span></a><span class="sd"> Assuming the schema is all lower case, this essentially makes identifiers case-insensitive.</span>
|
||||
</span><span id="lower_identities-11"><a href="#lower_identities-11"><span class="linenos">11</span></a>
|
||||
</span><span id="lower_identities-12"><a href="#lower_identities-12"><span class="linenos">12</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="lower_identities-13"><a href="#lower_identities-13"><span class="linenos">13</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="lower_identities-14"><a href="#lower_identities-14"><span class="linenos">14</span></a><span class="sd"> >>> expression = sqlglot.parse_one('SELECT Bar.A AS A FROM "Foo".Bar')</span>
|
||||
</span><span id="lower_identities-15"><a href="#lower_identities-15"><span class="linenos">15</span></a><span class="sd"> >>> lower_identities(expression).sql()</span>
|
||||
</span><span id="lower_identities-16"><a href="#lower_identities-16"><span class="linenos">16</span></a><span class="sd"> 'SELECT bar.a AS A FROM "Foo".bar'</span>
|
||||
</span><span id="lower_identities-17"><a href="#lower_identities-17"><span class="linenos">17</span></a>
|
||||
</span><span id="lower_identities-18"><a href="#lower_identities-18"><span class="linenos">18</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="lower_identities-19"><a href="#lower_identities-19"><span class="linenos">19</span></a><span class="sd"> expression (sqlglot.Expression): expression to quote</span>
|
||||
</span><span id="lower_identities-20"><a href="#lower_identities-20"><span class="linenos">20</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="lower_identities-21"><a href="#lower_identities-21"><span class="linenos">21</span></a><span class="sd"> sqlglot.Expression: quoted expression</span>
|
||||
</span><span id="lower_identities-22"><a href="#lower_identities-22"><span class="linenos">22</span></a><span class="sd"> """</span>
|
||||
</span><span id="lower_identities-23"><a href="#lower_identities-23"><span class="linenos">23</span></a> <span class="c1"># We need to leave the output aliases unchanged, so the selects need special handling</span>
|
||||
</span><span id="lower_identities-24"><a href="#lower_identities-24"><span class="linenos">24</span></a> <span class="n">_lower_selects</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="lower_identities-25"><a href="#lower_identities-25"><span class="linenos">25</span></a>
|
||||
</span><span id="lower_identities-26"><a href="#lower_identities-26"><span class="linenos">26</span></a> <span class="c1"># These clauses can reference output aliases and also need special handling</span>
|
||||
</span><span id="lower_identities-27"><a href="#lower_identities-27"><span class="linenos">27</span></a> <span class="n">_lower_order</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="lower_identities-28"><a href="#lower_identities-28"><span class="linenos">28</span></a> <span class="n">_lower_having</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="lower_identities-29"><a href="#lower_identities-29"><span class="linenos">29</span></a>
|
||||
</span><span id="lower_identities-30"><a href="#lower_identities-30"><span class="linenos">30</span></a> <span class="c1"># We've already handled these args, so don't traverse into them</span>
|
||||
</span><span id="lower_identities-31"><a href="#lower_identities-31"><span class="linenos">31</span></a> <span class="n">traversed</span> <span class="o">=</span> <span class="p">{</span><span class="s2">"expressions"</span><span class="p">,</span> <span class="s2">"order"</span><span class="p">,</span> <span class="s2">"having"</span><span class="p">}</span>
|
||||
</span><span id="lower_identities-32"><a href="#lower_identities-32"><span class="linenos">32</span></a>
|
||||
</span><span id="lower_identities-33"><a href="#lower_identities-33"><span class="linenos">33</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Subquery</span><span class="p">):</span>
|
||||
</span><span id="lower_identities-34"><a href="#lower_identities-34"><span class="linenos">34</span></a> <span class="c1"># Root subquery, e.g. (SELECT A AS A FROM X) LIMIT 1</span>
|
||||
</span><span id="lower_identities-35"><a href="#lower_identities-35"><span class="linenos">35</span></a> <span class="n">lower_identities</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">this</span><span class="p">)</span>
|
||||
</span><span id="lower_identities-36"><a href="#lower_identities-36"><span class="linenos">36</span></a> <span class="n">traversed</span> <span class="o">|=</span> <span class="p">{</span><span class="s2">"this"</span><span class="p">}</span>
|
||||
</span><span id="lower_identities-37"><a href="#lower_identities-37"><span class="linenos">37</span></a>
|
||||
</span><span id="lower_identities-38"><a href="#lower_identities-38"><span class="linenos">38</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Union</span><span class="p">):</span>
|
||||
</span><span id="lower_identities-39"><a href="#lower_identities-39"><span class="linenos">39</span></a> <span class="c1"># Union, e.g. SELECT A AS A FROM X UNION SELECT A AS A FROM X</span>
|
||||
</span><span id="lower_identities-40"><a href="#lower_identities-40"><span class="linenos">40</span></a> <span class="n">lower_identities</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">left</span><span class="p">)</span>
|
||||
</span><span id="lower_identities-41"><a href="#lower_identities-41"><span class="linenos">41</span></a> <span class="n">lower_identities</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">right</span><span class="p">)</span>
|
||||
</span><span id="lower_identities-42"><a href="#lower_identities-42"><span class="linenos">42</span></a> <span class="n">traversed</span> <span class="o">|=</span> <span class="p">{</span><span class="s2">"this"</span><span class="p">,</span> <span class="s2">"expression"</span><span class="p">}</span>
|
||||
</span><span id="lower_identities-43"><a href="#lower_identities-43"><span class="linenos">43</span></a>
|
||||
</span><span id="lower_identities-44"><a href="#lower_identities-44"><span class="linenos">44</span></a> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
|
||||
</span><span id="lower_identities-45"><a href="#lower_identities-45"><span class="linenos">45</span></a> <span class="k">if</span> <span class="n">k</span> <span class="ow">in</span> <span class="n">traversed</span><span class="p">:</span>
|
||||
</span><span id="lower_identities-46"><a href="#lower_identities-46"><span class="linenos">46</span></a> <span class="k">continue</span>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="lower_identities-5"><a href="#lower_identities-5"><span class="linenos"> 5</span></a><span class="k">def</span> <span class="nf">lower_identities</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="lower_identities-6"><a href="#lower_identities-6"><span class="linenos"> 6</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="lower_identities-7"><a href="#lower_identities-7"><span class="linenos"> 7</span></a><span class="sd"> Convert all unquoted identifiers to lower case.</span>
|
||||
</span><span id="lower_identities-8"><a href="#lower_identities-8"><span class="linenos"> 8</span></a>
|
||||
</span><span id="lower_identities-9"><a href="#lower_identities-9"><span class="linenos"> 9</span></a><span class="sd"> Assuming the schema is all lower case, this essentially makes identifiers case-insensitive.</span>
|
||||
</span><span id="lower_identities-10"><a href="#lower_identities-10"><span class="linenos">10</span></a>
|
||||
</span><span id="lower_identities-11"><a href="#lower_identities-11"><span class="linenos">11</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="lower_identities-12"><a href="#lower_identities-12"><span class="linenos">12</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="lower_identities-13"><a href="#lower_identities-13"><span class="linenos">13</span></a><span class="sd"> >>> expression = sqlglot.parse_one('SELECT Bar.A AS A FROM "Foo".Bar')</span>
|
||||
</span><span id="lower_identities-14"><a href="#lower_identities-14"><span class="linenos">14</span></a><span class="sd"> >>> lower_identities(expression).sql()</span>
|
||||
</span><span id="lower_identities-15"><a href="#lower_identities-15"><span class="linenos">15</span></a><span class="sd"> 'SELECT bar.a AS A FROM "Foo".bar'</span>
|
||||
</span><span id="lower_identities-16"><a href="#lower_identities-16"><span class="linenos">16</span></a>
|
||||
</span><span id="lower_identities-17"><a href="#lower_identities-17"><span class="linenos">17</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="lower_identities-18"><a href="#lower_identities-18"><span class="linenos">18</span></a><span class="sd"> expression (sqlglot.Expression): expression to quote</span>
|
||||
</span><span id="lower_identities-19"><a href="#lower_identities-19"><span class="linenos">19</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="lower_identities-20"><a href="#lower_identities-20"><span class="linenos">20</span></a><span class="sd"> sqlglot.Expression: quoted expression</span>
|
||||
</span><span id="lower_identities-21"><a href="#lower_identities-21"><span class="linenos">21</span></a><span class="sd"> """</span>
|
||||
</span><span id="lower_identities-22"><a href="#lower_identities-22"><span class="linenos">22</span></a> <span class="c1"># We need to leave the output aliases unchanged, so the selects need special handling</span>
|
||||
</span><span id="lower_identities-23"><a href="#lower_identities-23"><span class="linenos">23</span></a> <span class="n">_lower_selects</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="lower_identities-24"><a href="#lower_identities-24"><span class="linenos">24</span></a>
|
||||
</span><span id="lower_identities-25"><a href="#lower_identities-25"><span class="linenos">25</span></a> <span class="c1"># These clauses can reference output aliases and also need special handling</span>
|
||||
</span><span id="lower_identities-26"><a href="#lower_identities-26"><span class="linenos">26</span></a> <span class="n">_lower_order</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="lower_identities-27"><a href="#lower_identities-27"><span class="linenos">27</span></a> <span class="n">_lower_having</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="lower_identities-28"><a href="#lower_identities-28"><span class="linenos">28</span></a>
|
||||
</span><span id="lower_identities-29"><a href="#lower_identities-29"><span class="linenos">29</span></a> <span class="c1"># We've already handled these args, so don't traverse into them</span>
|
||||
</span><span id="lower_identities-30"><a href="#lower_identities-30"><span class="linenos">30</span></a> <span class="n">traversed</span> <span class="o">=</span> <span class="p">{</span><span class="s2">"expressions"</span><span class="p">,</span> <span class="s2">"order"</span><span class="p">,</span> <span class="s2">"having"</span><span class="p">}</span>
|
||||
</span><span id="lower_identities-31"><a href="#lower_identities-31"><span class="linenos">31</span></a>
|
||||
</span><span id="lower_identities-32"><a href="#lower_identities-32"><span class="linenos">32</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Subquery</span><span class="p">):</span>
|
||||
</span><span id="lower_identities-33"><a href="#lower_identities-33"><span class="linenos">33</span></a> <span class="c1"># Root subquery, e.g. (SELECT A AS A FROM X) LIMIT 1</span>
|
||||
</span><span id="lower_identities-34"><a href="#lower_identities-34"><span class="linenos">34</span></a> <span class="n">lower_identities</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">this</span><span class="p">)</span>
|
||||
</span><span id="lower_identities-35"><a href="#lower_identities-35"><span class="linenos">35</span></a> <span class="n">traversed</span> <span class="o">|=</span> <span class="p">{</span><span class="s2">"this"</span><span class="p">}</span>
|
||||
</span><span id="lower_identities-36"><a href="#lower_identities-36"><span class="linenos">36</span></a>
|
||||
</span><span id="lower_identities-37"><a href="#lower_identities-37"><span class="linenos">37</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Union</span><span class="p">):</span>
|
||||
</span><span id="lower_identities-38"><a href="#lower_identities-38"><span class="linenos">38</span></a> <span class="c1"># Union, e.g. SELECT A AS A FROM X UNION SELECT A AS A FROM X</span>
|
||||
</span><span id="lower_identities-39"><a href="#lower_identities-39"><span class="linenos">39</span></a> <span class="n">lower_identities</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">left</span><span class="p">)</span>
|
||||
</span><span id="lower_identities-40"><a href="#lower_identities-40"><span class="linenos">40</span></a> <span class="n">lower_identities</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">right</span><span class="p">)</span>
|
||||
</span><span id="lower_identities-41"><a href="#lower_identities-41"><span class="linenos">41</span></a> <span class="n">traversed</span> <span class="o">|=</span> <span class="p">{</span><span class="s2">"this"</span><span class="p">,</span> <span class="s2">"expression"</span><span class="p">}</span>
|
||||
</span><span id="lower_identities-42"><a href="#lower_identities-42"><span class="linenos">42</span></a>
|
||||
</span><span id="lower_identities-43"><a href="#lower_identities-43"><span class="linenos">43</span></a> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">iter_expressions</span><span class="p">():</span>
|
||||
</span><span id="lower_identities-44"><a href="#lower_identities-44"><span class="linenos">44</span></a> <span class="k">if</span> <span class="n">k</span> <span class="ow">in</span> <span class="n">traversed</span><span class="p">:</span>
|
||||
</span><span id="lower_identities-45"><a href="#lower_identities-45"><span class="linenos">45</span></a> <span class="k">continue</span>
|
||||
</span><span id="lower_identities-46"><a href="#lower_identities-46"><span class="linenos">46</span></a> <span class="n">v</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span><span class="n">_lower</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
|
||||
</span><span id="lower_identities-47"><a href="#lower_identities-47"><span class="linenos">47</span></a>
|
||||
</span><span id="lower_identities-48"><a href="#lower_identities-48"><span class="linenos">48</span></a> <span class="k">for</span> <span class="n">child</span> <span class="ow">in</span> <span class="n">ensure_collection</span><span class="p">(</span><span class="n">v</span><span class="p">):</span>
|
||||
</span><span id="lower_identities-49"><a href="#lower_identities-49"><span class="linenos">49</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">child</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">):</span>
|
||||
</span><span id="lower_identities-50"><a href="#lower_identities-50"><span class="linenos">50</span></a> <span class="n">child</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span><span class="n">_lower</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
|
||||
</span><span id="lower_identities-51"><a href="#lower_identities-51"><span class="linenos">51</span></a>
|
||||
</span><span id="lower_identities-52"><a href="#lower_identities-52"><span class="linenos">52</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="lower_identities-48"><a href="#lower_identities-48"><span class="linenos">48</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span></pre></div>
|
||||
|
||||
|
||||
|
|
|
|||
|
|
@ -3,7 +3,7 @@
|
|||
<head>
|
||||
<meta charset="utf-8">
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1">
|
||||
<meta name="generator" content="pdoc 13.0.0"/>
|
||||
<meta name="generator" content="pdoc 13.0.1"/>
|
||||
<title>sqlglot.optimizer.merge_subqueries API documentation</title>
|
||||
|
||||
<style>/*! * Bootstrap Reboot v5.0.0 (https://getbootstrap.com/) * Copyright 2011-2021 The Bootstrap Authors * Copyright 2011-2021 Twitter, Inc. * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE) * Forked from Normalize.css, licensed MIT (https://github.com/necolas/normalize.css/blob/master/LICENSE.md) */*,::after,::before{box-sizing:border-box}@media (prefers-reduced-motion:no-preference){:root{scroll-behavior:smooth}}body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans","Liberation Sans",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";font-size:1rem;font-weight:400;line-height:1.5;color:#212529;background-color:#fff;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:transparent}hr{margin:1rem 0;color:inherit;background-color:currentColor;border:0;opacity:.25}hr:not([size]){height:1px}h1,h2,h3,h4,h5,h6{margin-top:0;margin-bottom:.5rem;font-weight:500;line-height:1.2}h1{font-size:calc(1.375rem + 1.5vw)}@media (min-width:1200px){h1{font-size:2.5rem}}h2{font-size:calc(1.325rem + .9vw)}@media (min-width:1200px){h2{font-size:2rem}}h3{font-size:calc(1.3rem + .6vw)}@media (min-width:1200px){h3{font-size:1.75rem}}h4{font-size:calc(1.275rem + .3vw)}@media (min-width:1200px){h4{font-size:1.5rem}}h5{font-size:1.25rem}h6{font-size:1rem}p{margin-top:0;margin-bottom:1rem}abbr[data-bs-original-title],abbr[title]{-webkit-text-decoration:underline dotted;text-decoration:underline dotted;cursor:help;-webkit-text-decoration-skip-ink:none;text-decoration-skip-ink:none}address{margin-bottom:1rem;font-style:normal;line-height:inherit}ol,ul{padding-left:2rem}dl,ol,ul{margin-top:0;margin-bottom:1rem}ol ol,ol ul,ul ol,ul ul{margin-bottom:0}dt{font-weight:700}dd{margin-bottom:.5rem;margin-left:0}blockquote{margin:0 0 1rem}b,strong{font-weight:bolder}small{font-size:.875em}mark{padding:.2em;background-color:#fcf8e3}sub,sup{position:relative;font-size:.75em;line-height:0;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}a{color:#0d6efd;text-decoration:underline}a:hover{color:#0a58ca}a:not([href]):not([class]),a:not([href]):not([class]):hover{color:inherit;text-decoration:none}code,kbd,pre,samp{font-family:SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;font-size:1em;direction:ltr;unicode-bidi:bidi-override}pre{display:block;margin-top:0;margin-bottom:1rem;overflow:auto;font-size:.875em}pre code{font-size:inherit;color:inherit;word-break:normal}code{font-size:.875em;color:#d63384;word-wrap:break-word}a>code{color:inherit}kbd{padding:.2rem .4rem;font-size:.875em;color:#fff;background-color:#212529;border-radius:.2rem}kbd kbd{padding:0;font-size:1em;font-weight:700}figure{margin:0 0 1rem}img,svg{vertical-align:middle}table{caption-side:bottom;border-collapse:collapse}caption{padding-top:.5rem;padding-bottom:.5rem;color:#6c757d;text-align:left}th{text-align:inherit;text-align:-webkit-match-parent}tbody,td,tfoot,th,thead,tr{border-color:inherit;border-style:solid;border-width:0}label{display:inline-block}button{border-radius:0}button:focus:not(:focus-visible){outline:0}button,input,optgroup,select,textarea{margin:0;font-family:inherit;font-size:inherit;line-height:inherit}button,select{text-transform:none}[role=button]{cursor:pointer}select{word-wrap:normal}select:disabled{opacity:1}[list]::-webkit-calendar-picker-indicator{display:none}[type=button],[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]:not(:disabled),[type=reset]:not(:disabled),[type=submit]:not(:disabled),button:not(:disabled){cursor:pointer}::-moz-focus-inner{padding:0;border-style:none}textarea{resize:vertical}fieldset{min-width:0;padding:0;margin:0;border:0}legend{float:left;width:100%;padding:0;margin-bottom:.5rem;font-size:calc(1.275rem + .3vw);line-height:inherit}@media (min-width:1200px){legend{font-size:1.5rem}}legend+*{clear:left}::-webkit-datetime-edit-day-field,::-webkit-datetime-edit-fields-wrapper,::-webkit-datetime-edit-hour-field,::-webkit-datetime-edit-minute,::-webkit-datetime-edit-month-field,::-webkit-datetime-edit-text,::-webkit-datetime-edit-year-field{padding:0}::-webkit-inner-spin-button{height:auto}[type=search]{outline-offset:-2px;-webkit-appearance:textfield}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-color-swatch-wrapper{padding:0}::file-selector-button{font:inherit}::-webkit-file-upload-button{font:inherit;-webkit-appearance:button}output{display:inline-block}iframe{border:0}summary{display:list-item;cursor:pointer}progress{vertical-align:baseline}[hidden]{display:none!important}</style>
|
||||
|
|
@ -28,8 +28,8 @@
|
|||
|
||||
|
||||
|
||||
<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
||||
<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
||||
<li>
|
||||
<a class="function" href="#merge_subqueries">merge_subqueries</a>
|
||||
</li>
|
||||
|
|
@ -67,385 +67,384 @@
|
|||
</span><span id="L-3"><a href="#L-3"><span class="linenos"> 3</span></a><span class="kn">from</span> <span class="nn">sqlglot</span> <span class="kn">import</span> <span class="n">expressions</span> <span class="k">as</span> <span class="n">exp</span>
|
||||
</span><span id="L-4"><a href="#L-4"><span class="linenos"> 4</span></a><span class="kn">from</span> <span class="nn">sqlglot.helper</span> <span class="kn">import</span> <span class="n">find_new_name</span>
|
||||
</span><span id="L-5"><a href="#L-5"><span class="linenos"> 5</span></a><span class="kn">from</span> <span class="nn">sqlglot.optimizer.scope</span> <span class="kn">import</span> <span class="n">Scope</span><span class="p">,</span> <span class="n">traverse_scope</span>
|
||||
</span><span id="L-6"><a href="#L-6"><span class="linenos"> 6</span></a><span class="kn">from</span> <span class="nn">sqlglot.optimizer.simplify</span> <span class="kn">import</span> <span class="n">simplify</span>
|
||||
</span><span id="L-6"><a href="#L-6"><span class="linenos"> 6</span></a>
|
||||
</span><span id="L-7"><a href="#L-7"><span class="linenos"> 7</span></a>
|
||||
</span><span id="L-8"><a href="#L-8"><span class="linenos"> 8</span></a>
|
||||
</span><span id="L-9"><a href="#L-9"><span class="linenos"> 9</span></a><span class="k">def</span> <span class="nf">merge_subqueries</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
|
||||
</span><span id="L-10"><a href="#L-10"><span class="linenos"> 10</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-11"><a href="#L-11"><span class="linenos"> 11</span></a><span class="sd"> Rewrite sqlglot AST to merge derived tables into the outer query.</span>
|
||||
</span><span id="L-12"><a href="#L-12"><span class="linenos"> 12</span></a>
|
||||
</span><span id="L-13"><a href="#L-13"><span class="linenos"> 13</span></a><span class="sd"> This also merges CTEs if they are selected from only once.</span>
|
||||
</span><span id="L-14"><a href="#L-14"><span class="linenos"> 14</span></a>
|
||||
</span><span id="L-15"><a href="#L-15"><span class="linenos"> 15</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="L-16"><a href="#L-16"><span class="linenos"> 16</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="L-17"><a href="#L-17"><span class="linenos"> 17</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT a FROM (SELECT x.a FROM x) JOIN y")</span>
|
||||
</span><span id="L-18"><a href="#L-18"><span class="linenos"> 18</span></a><span class="sd"> >>> merge_subqueries(expression).sql()</span>
|
||||
</span><span id="L-19"><a href="#L-19"><span class="linenos"> 19</span></a><span class="sd"> 'SELECT x.a FROM x JOIN y'</span>
|
||||
</span><span id="L-20"><a href="#L-20"><span class="linenos"> 20</span></a>
|
||||
</span><span id="L-21"><a href="#L-21"><span class="linenos"> 21</span></a><span class="sd"> If `leave_tables_isolated` is True, this will not merge inner queries into outer</span>
|
||||
</span><span id="L-22"><a href="#L-22"><span class="linenos"> 22</span></a><span class="sd"> queries if it would result in multiple table selects in a single query:</span>
|
||||
</span><span id="L-23"><a href="#L-23"><span class="linenos"> 23</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT a FROM (SELECT x.a FROM x) JOIN y")</span>
|
||||
</span><span id="L-24"><a href="#L-24"><span class="linenos"> 24</span></a><span class="sd"> >>> merge_subqueries(expression, leave_tables_isolated=True).sql()</span>
|
||||
</span><span id="L-25"><a href="#L-25"><span class="linenos"> 25</span></a><span class="sd"> 'SELECT a FROM (SELECT x.a FROM x) JOIN y'</span>
|
||||
</span><span id="L-26"><a href="#L-26"><span class="linenos"> 26</span></a>
|
||||
</span><span id="L-27"><a href="#L-27"><span class="linenos"> 27</span></a><span class="sd"> Inspired by https://dev.mysql.com/doc/refman/8.0/en/derived-table-optimization.html</span>
|
||||
</span><span id="L-28"><a href="#L-28"><span class="linenos"> 28</span></a>
|
||||
</span><span id="L-29"><a href="#L-29"><span class="linenos"> 29</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-30"><a href="#L-30"><span class="linenos"> 30</span></a><span class="sd"> expression (sqlglot.Expression): expression to optimize</span>
|
||||
</span><span id="L-31"><a href="#L-31"><span class="linenos"> 31</span></a><span class="sd"> leave_tables_isolated (bool):</span>
|
||||
</span><span id="L-32"><a href="#L-32"><span class="linenos"> 32</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="L-33"><a href="#L-33"><span class="linenos"> 33</span></a><span class="sd"> sqlglot.Expression: optimized expression</span>
|
||||
</span><span id="L-34"><a href="#L-34"><span class="linenos"> 34</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-35"><a href="#L-35"><span class="linenos"> 35</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">merge_ctes</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="p">)</span>
|
||||
</span><span id="L-36"><a href="#L-36"><span class="linenos"> 36</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">merge_derived_tables</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="p">)</span>
|
||||
</span><span id="L-37"><a href="#L-37"><span class="linenos"> 37</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-8"><a href="#L-8"><span class="linenos"> 8</span></a><span class="k">def</span> <span class="nf">merge_subqueries</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
|
||||
</span><span id="L-9"><a href="#L-9"><span class="linenos"> 9</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-10"><a href="#L-10"><span class="linenos"> 10</span></a><span class="sd"> Rewrite sqlglot AST to merge derived tables into the outer query.</span>
|
||||
</span><span id="L-11"><a href="#L-11"><span class="linenos"> 11</span></a>
|
||||
</span><span id="L-12"><a href="#L-12"><span class="linenos"> 12</span></a><span class="sd"> This also merges CTEs if they are selected from only once.</span>
|
||||
</span><span id="L-13"><a href="#L-13"><span class="linenos"> 13</span></a>
|
||||
</span><span id="L-14"><a href="#L-14"><span class="linenos"> 14</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="L-15"><a href="#L-15"><span class="linenos"> 15</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="L-16"><a href="#L-16"><span class="linenos"> 16</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT a FROM (SELECT x.a FROM x) JOIN y")</span>
|
||||
</span><span id="L-17"><a href="#L-17"><span class="linenos"> 17</span></a><span class="sd"> >>> merge_subqueries(expression).sql()</span>
|
||||
</span><span id="L-18"><a href="#L-18"><span class="linenos"> 18</span></a><span class="sd"> 'SELECT x.a FROM x JOIN y'</span>
|
||||
</span><span id="L-19"><a href="#L-19"><span class="linenos"> 19</span></a>
|
||||
</span><span id="L-20"><a href="#L-20"><span class="linenos"> 20</span></a><span class="sd"> If `leave_tables_isolated` is True, this will not merge inner queries into outer</span>
|
||||
</span><span id="L-21"><a href="#L-21"><span class="linenos"> 21</span></a><span class="sd"> queries if it would result in multiple table selects in a single query:</span>
|
||||
</span><span id="L-22"><a href="#L-22"><span class="linenos"> 22</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT a FROM (SELECT x.a FROM x) JOIN y")</span>
|
||||
</span><span id="L-23"><a href="#L-23"><span class="linenos"> 23</span></a><span class="sd"> >>> merge_subqueries(expression, leave_tables_isolated=True).sql()</span>
|
||||
</span><span id="L-24"><a href="#L-24"><span class="linenos"> 24</span></a><span class="sd"> 'SELECT a FROM (SELECT x.a FROM x) JOIN y'</span>
|
||||
</span><span id="L-25"><a href="#L-25"><span class="linenos"> 25</span></a>
|
||||
</span><span id="L-26"><a href="#L-26"><span class="linenos"> 26</span></a><span class="sd"> Inspired by https://dev.mysql.com/doc/refman/8.0/en/derived-table-optimization.html</span>
|
||||
</span><span id="L-27"><a href="#L-27"><span class="linenos"> 27</span></a>
|
||||
</span><span id="L-28"><a href="#L-28"><span class="linenos"> 28</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-29"><a href="#L-29"><span class="linenos"> 29</span></a><span class="sd"> expression (sqlglot.Expression): expression to optimize</span>
|
||||
</span><span id="L-30"><a href="#L-30"><span class="linenos"> 30</span></a><span class="sd"> leave_tables_isolated (bool):</span>
|
||||
</span><span id="L-31"><a href="#L-31"><span class="linenos"> 31</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="L-32"><a href="#L-32"><span class="linenos"> 32</span></a><span class="sd"> sqlglot.Expression: optimized expression</span>
|
||||
</span><span id="L-33"><a href="#L-33"><span class="linenos"> 33</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-34"><a href="#L-34"><span class="linenos"> 34</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">merge_ctes</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="p">)</span>
|
||||
</span><span id="L-35"><a href="#L-35"><span class="linenos"> 35</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">merge_derived_tables</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="p">)</span>
|
||||
</span><span id="L-36"><a href="#L-36"><span class="linenos"> 36</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-37"><a href="#L-37"><span class="linenos"> 37</span></a>
|
||||
</span><span id="L-38"><a href="#L-38"><span class="linenos"> 38</span></a>
|
||||
</span><span id="L-39"><a href="#L-39"><span class="linenos"> 39</span></a>
|
||||
</span><span id="L-40"><a href="#L-40"><span class="linenos"> 40</span></a><span class="c1"># If a derived table has these Select args, it can't be merged</span>
|
||||
</span><span id="L-41"><a href="#L-41"><span class="linenos"> 41</span></a><span class="n">UNMERGABLE_ARGS</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="o">.</span><span class="n">arg_types</span><span class="p">)</span> <span class="o">-</span> <span class="p">{</span>
|
||||
</span><span id="L-42"><a href="#L-42"><span class="linenos"> 42</span></a> <span class="s2">"expressions"</span><span class="p">,</span>
|
||||
</span><span id="L-43"><a href="#L-43"><span class="linenos"> 43</span></a> <span class="s2">"from"</span><span class="p">,</span>
|
||||
</span><span id="L-44"><a href="#L-44"><span class="linenos"> 44</span></a> <span class="s2">"joins"</span><span class="p">,</span>
|
||||
</span><span id="L-45"><a href="#L-45"><span class="linenos"> 45</span></a> <span class="s2">"where"</span><span class="p">,</span>
|
||||
</span><span id="L-46"><a href="#L-46"><span class="linenos"> 46</span></a> <span class="s2">"order"</span><span class="p">,</span>
|
||||
</span><span id="L-47"><a href="#L-47"><span class="linenos"> 47</span></a> <span class="s2">"hint"</span><span class="p">,</span>
|
||||
</span><span id="L-48"><a href="#L-48"><span class="linenos"> 48</span></a><span class="p">}</span>
|
||||
</span><span id="L-39"><a href="#L-39"><span class="linenos"> 39</span></a><span class="c1"># If a derived table has these Select args, it can't be merged</span>
|
||||
</span><span id="L-40"><a href="#L-40"><span class="linenos"> 40</span></a><span class="n">UNMERGABLE_ARGS</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="o">.</span><span class="n">arg_types</span><span class="p">)</span> <span class="o">-</span> <span class="p">{</span>
|
||||
</span><span id="L-41"><a href="#L-41"><span class="linenos"> 41</span></a> <span class="s2">"expressions"</span><span class="p">,</span>
|
||||
</span><span id="L-42"><a href="#L-42"><span class="linenos"> 42</span></a> <span class="s2">"from"</span><span class="p">,</span>
|
||||
</span><span id="L-43"><a href="#L-43"><span class="linenos"> 43</span></a> <span class="s2">"joins"</span><span class="p">,</span>
|
||||
</span><span id="L-44"><a href="#L-44"><span class="linenos"> 44</span></a> <span class="s2">"where"</span><span class="p">,</span>
|
||||
</span><span id="L-45"><a href="#L-45"><span class="linenos"> 45</span></a> <span class="s2">"order"</span><span class="p">,</span>
|
||||
</span><span id="L-46"><a href="#L-46"><span class="linenos"> 46</span></a> <span class="s2">"hint"</span><span class="p">,</span>
|
||||
</span><span id="L-47"><a href="#L-47"><span class="linenos"> 47</span></a><span class="p">}</span>
|
||||
</span><span id="L-48"><a href="#L-48"><span class="linenos"> 48</span></a>
|
||||
</span><span id="L-49"><a href="#L-49"><span class="linenos"> 49</span></a>
|
||||
</span><span id="L-50"><a href="#L-50"><span class="linenos"> 50</span></a>
|
||||
</span><span id="L-51"><a href="#L-51"><span class="linenos"> 51</span></a><span class="k">def</span> <span class="nf">merge_ctes</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
|
||||
</span><span id="L-52"><a href="#L-52"><span class="linenos"> 52</span></a> <span class="n">scopes</span> <span class="o">=</span> <span class="n">traverse_scope</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="L-53"><a href="#L-53"><span class="linenos"> 53</span></a>
|
||||
</span><span id="L-54"><a href="#L-54"><span class="linenos"> 54</span></a> <span class="c1"># All places where we select from CTEs.</span>
|
||||
</span><span id="L-55"><a href="#L-55"><span class="linenos"> 55</span></a> <span class="c1"># We key on the CTE scope so we can detect CTES that are selected from multiple times.</span>
|
||||
</span><span id="L-56"><a href="#L-56"><span class="linenos"> 56</span></a> <span class="n">cte_selections</span> <span class="o">=</span> <span class="n">defaultdict</span><span class="p">(</span><span class="nb">list</span><span class="p">)</span>
|
||||
</span><span id="L-57"><a href="#L-57"><span class="linenos"> 57</span></a> <span class="k">for</span> <span class="n">outer_scope</span> <span class="ow">in</span> <span class="n">scopes</span><span class="p">:</span>
|
||||
</span><span id="L-58"><a href="#L-58"><span class="linenos"> 58</span></a> <span class="k">for</span> <span class="n">table</span><span class="p">,</span> <span class="n">inner_scope</span> <span class="ow">in</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="o">.</span><span class="n">values</span><span class="p">():</span>
|
||||
</span><span id="L-59"><a href="#L-59"><span class="linenos"> 59</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">inner_scope</span><span class="p">,</span> <span class="n">Scope</span><span class="p">)</span> <span class="ow">and</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">is_cte</span><span class="p">:</span>
|
||||
</span><span id="L-60"><a href="#L-60"><span class="linenos"> 60</span></a> <span class="n">cte_selections</span><span class="p">[</span><span class="nb">id</span><span class="p">(</span><span class="n">inner_scope</span><span class="p">)]</span><span class="o">.</span><span class="n">append</span><span class="p">(</span>
|
||||
</span><span id="L-61"><a href="#L-61"><span class="linenos"> 61</span></a> <span class="p">(</span>
|
||||
</span><span id="L-62"><a href="#L-62"><span class="linenos"> 62</span></a> <span class="n">outer_scope</span><span class="p">,</span>
|
||||
</span><span id="L-63"><a href="#L-63"><span class="linenos"> 63</span></a> <span class="n">inner_scope</span><span class="p">,</span>
|
||||
</span><span id="L-64"><a href="#L-64"><span class="linenos"> 64</span></a> <span class="n">table</span><span class="p">,</span>
|
||||
</span><span id="L-65"><a href="#L-65"><span class="linenos"> 65</span></a> <span class="p">)</span>
|
||||
</span><span id="L-66"><a href="#L-66"><span class="linenos"> 66</span></a> <span class="p">)</span>
|
||||
</span><span id="L-67"><a href="#L-67"><span class="linenos"> 67</span></a>
|
||||
</span><span id="L-68"><a href="#L-68"><span class="linenos"> 68</span></a> <span class="n">singular_cte_selections</span> <span class="o">=</span> <span class="p">[</span><span class="n">v</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">cte_selections</span><span class="o">.</span><span class="n">items</span><span class="p">()</span> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="p">]</span>
|
||||
</span><span id="L-69"><a href="#L-69"><span class="linenos"> 69</span></a> <span class="k">for</span> <span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">table</span> <span class="ow">in</span> <span class="n">singular_cte_selections</span><span class="p">:</span>
|
||||
</span><span id="L-70"><a href="#L-70"><span class="linenos"> 70</span></a> <span class="n">from_or_join</span> <span class="o">=</span> <span class="n">table</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">)</span>
|
||||
</span><span id="L-71"><a href="#L-71"><span class="linenos"> 71</span></a> <span class="k">if</span> <span class="n">_mergeable</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">):</span>
|
||||
</span><span id="L-72"><a href="#L-72"><span class="linenos"> 72</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">table</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="L-73"><a href="#L-73"><span class="linenos"> 73</span></a> <span class="n">_rename_inner_sources</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="L-74"><a href="#L-74"><span class="linenos"> 74</span></a> <span class="n">_merge_from</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">table</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="L-75"><a href="#L-75"><span class="linenos"> 75</span></a> <span class="n">_merge_expressions</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="L-76"><a href="#L-76"><span class="linenos"> 76</span></a> <span class="n">_merge_joins</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">)</span>
|
||||
</span><span id="L-77"><a href="#L-77"><span class="linenos"> 77</span></a> <span class="n">_merge_where</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">)</span>
|
||||
</span><span id="L-78"><a href="#L-78"><span class="linenos"> 78</span></a> <span class="n">_merge_order</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">)</span>
|
||||
</span><span id="L-79"><a href="#L-79"><span class="linenos"> 79</span></a> <span class="n">_merge_hints</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">)</span>
|
||||
</span><span id="L-80"><a href="#L-80"><span class="linenos"> 80</span></a> <span class="n">_pop_cte</span><span class="p">(</span><span class="n">inner_scope</span><span class="p">)</span>
|
||||
</span><span id="L-81"><a href="#L-81"><span class="linenos"> 81</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">clear_cache</span><span class="p">()</span>
|
||||
</span><span id="L-82"><a href="#L-82"><span class="linenos"> 82</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-50"><a href="#L-50"><span class="linenos"> 50</span></a><span class="k">def</span> <span class="nf">merge_ctes</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
|
||||
</span><span id="L-51"><a href="#L-51"><span class="linenos"> 51</span></a> <span class="n">scopes</span> <span class="o">=</span> <span class="n">traverse_scope</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="L-52"><a href="#L-52"><span class="linenos"> 52</span></a>
|
||||
</span><span id="L-53"><a href="#L-53"><span class="linenos"> 53</span></a> <span class="c1"># All places where we select from CTEs.</span>
|
||||
</span><span id="L-54"><a href="#L-54"><span class="linenos"> 54</span></a> <span class="c1"># We key on the CTE scope so we can detect CTES that are selected from multiple times.</span>
|
||||
</span><span id="L-55"><a href="#L-55"><span class="linenos"> 55</span></a> <span class="n">cte_selections</span> <span class="o">=</span> <span class="n">defaultdict</span><span class="p">(</span><span class="nb">list</span><span class="p">)</span>
|
||||
</span><span id="L-56"><a href="#L-56"><span class="linenos"> 56</span></a> <span class="k">for</span> <span class="n">outer_scope</span> <span class="ow">in</span> <span class="n">scopes</span><span class="p">:</span>
|
||||
</span><span id="L-57"><a href="#L-57"><span class="linenos"> 57</span></a> <span class="k">for</span> <span class="n">table</span><span class="p">,</span> <span class="n">inner_scope</span> <span class="ow">in</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="o">.</span><span class="n">values</span><span class="p">():</span>
|
||||
</span><span id="L-58"><a href="#L-58"><span class="linenos"> 58</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">inner_scope</span><span class="p">,</span> <span class="n">Scope</span><span class="p">)</span> <span class="ow">and</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">is_cte</span><span class="p">:</span>
|
||||
</span><span id="L-59"><a href="#L-59"><span class="linenos"> 59</span></a> <span class="n">cte_selections</span><span class="p">[</span><span class="nb">id</span><span class="p">(</span><span class="n">inner_scope</span><span class="p">)]</span><span class="o">.</span><span class="n">append</span><span class="p">(</span>
|
||||
</span><span id="L-60"><a href="#L-60"><span class="linenos"> 60</span></a> <span class="p">(</span>
|
||||
</span><span id="L-61"><a href="#L-61"><span class="linenos"> 61</span></a> <span class="n">outer_scope</span><span class="p">,</span>
|
||||
</span><span id="L-62"><a href="#L-62"><span class="linenos"> 62</span></a> <span class="n">inner_scope</span><span class="p">,</span>
|
||||
</span><span id="L-63"><a href="#L-63"><span class="linenos"> 63</span></a> <span class="n">table</span><span class="p">,</span>
|
||||
</span><span id="L-64"><a href="#L-64"><span class="linenos"> 64</span></a> <span class="p">)</span>
|
||||
</span><span id="L-65"><a href="#L-65"><span class="linenos"> 65</span></a> <span class="p">)</span>
|
||||
</span><span id="L-66"><a href="#L-66"><span class="linenos"> 66</span></a>
|
||||
</span><span id="L-67"><a href="#L-67"><span class="linenos"> 67</span></a> <span class="n">singular_cte_selections</span> <span class="o">=</span> <span class="p">[</span><span class="n">v</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">cte_selections</span><span class="o">.</span><span class="n">items</span><span class="p">()</span> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="p">]</span>
|
||||
</span><span id="L-68"><a href="#L-68"><span class="linenos"> 68</span></a> <span class="k">for</span> <span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">table</span> <span class="ow">in</span> <span class="n">singular_cte_selections</span><span class="p">:</span>
|
||||
</span><span id="L-69"><a href="#L-69"><span class="linenos"> 69</span></a> <span class="n">from_or_join</span> <span class="o">=</span> <span class="n">table</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">)</span>
|
||||
</span><span id="L-70"><a href="#L-70"><span class="linenos"> 70</span></a> <span class="k">if</span> <span class="n">_mergeable</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">):</span>
|
||||
</span><span id="L-71"><a href="#L-71"><span class="linenos"> 71</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">table</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="L-72"><a href="#L-72"><span class="linenos"> 72</span></a> <span class="n">_rename_inner_sources</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="L-73"><a href="#L-73"><span class="linenos"> 73</span></a> <span class="n">_merge_from</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">table</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="L-74"><a href="#L-74"><span class="linenos"> 74</span></a> <span class="n">_merge_expressions</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="L-75"><a href="#L-75"><span class="linenos"> 75</span></a> <span class="n">_merge_joins</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">)</span>
|
||||
</span><span id="L-76"><a href="#L-76"><span class="linenos"> 76</span></a> <span class="n">_merge_where</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">)</span>
|
||||
</span><span id="L-77"><a href="#L-77"><span class="linenos"> 77</span></a> <span class="n">_merge_order</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">)</span>
|
||||
</span><span id="L-78"><a href="#L-78"><span class="linenos"> 78</span></a> <span class="n">_merge_hints</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">)</span>
|
||||
</span><span id="L-79"><a href="#L-79"><span class="linenos"> 79</span></a> <span class="n">_pop_cte</span><span class="p">(</span><span class="n">inner_scope</span><span class="p">)</span>
|
||||
</span><span id="L-80"><a href="#L-80"><span class="linenos"> 80</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">clear_cache</span><span class="p">()</span>
|
||||
</span><span id="L-81"><a href="#L-81"><span class="linenos"> 81</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-82"><a href="#L-82"><span class="linenos"> 82</span></a>
|
||||
</span><span id="L-83"><a href="#L-83"><span class="linenos"> 83</span></a>
|
||||
</span><span id="L-84"><a href="#L-84"><span class="linenos"> 84</span></a>
|
||||
</span><span id="L-85"><a href="#L-85"><span class="linenos"> 85</span></a><span class="k">def</span> <span class="nf">merge_derived_tables</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
|
||||
</span><span id="L-86"><a href="#L-86"><span class="linenos"> 86</span></a> <span class="k">for</span> <span class="n">outer_scope</span> <span class="ow">in</span> <span class="n">traverse_scope</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="L-87"><a href="#L-87"><span class="linenos"> 87</span></a> <span class="k">for</span> <span class="n">subquery</span> <span class="ow">in</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">derived_tables</span><span class="p">:</span>
|
||||
</span><span id="L-88"><a href="#L-88"><span class="linenos"> 88</span></a> <span class="n">from_or_join</span> <span class="o">=</span> <span class="n">subquery</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">)</span>
|
||||
</span><span id="L-89"><a href="#L-89"><span class="linenos"> 89</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">subquery</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="L-90"><a href="#L-90"><span class="linenos"> 90</span></a> <span class="n">inner_scope</span> <span class="o">=</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">sources</span><span class="p">[</span><span class="n">alias</span><span class="p">]</span>
|
||||
</span><span id="L-91"><a href="#L-91"><span class="linenos"> 91</span></a> <span class="k">if</span> <span class="n">_mergeable</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">):</span>
|
||||
</span><span id="L-92"><a href="#L-92"><span class="linenos"> 92</span></a> <span class="n">_rename_inner_sources</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="L-93"><a href="#L-93"><span class="linenos"> 93</span></a> <span class="n">_merge_from</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">subquery</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="L-94"><a href="#L-94"><span class="linenos"> 94</span></a> <span class="n">_merge_expressions</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="L-95"><a href="#L-95"><span class="linenos"> 95</span></a> <span class="n">_merge_joins</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">)</span>
|
||||
</span><span id="L-96"><a href="#L-96"><span class="linenos"> 96</span></a> <span class="n">_merge_where</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">)</span>
|
||||
</span><span id="L-97"><a href="#L-97"><span class="linenos"> 97</span></a> <span class="n">_merge_order</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">)</span>
|
||||
</span><span id="L-98"><a href="#L-98"><span class="linenos"> 98</span></a> <span class="n">_merge_hints</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">)</span>
|
||||
</span><span id="L-99"><a href="#L-99"><span class="linenos"> 99</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">clear_cache</span><span class="p">()</span>
|
||||
</span><span id="L-100"><a href="#L-100"><span class="linenos">100</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-84"><a href="#L-84"><span class="linenos"> 84</span></a><span class="k">def</span> <span class="nf">merge_derived_tables</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
|
||||
</span><span id="L-85"><a href="#L-85"><span class="linenos"> 85</span></a> <span class="k">for</span> <span class="n">outer_scope</span> <span class="ow">in</span> <span class="n">traverse_scope</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="L-86"><a href="#L-86"><span class="linenos"> 86</span></a> <span class="k">for</span> <span class="n">subquery</span> <span class="ow">in</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">derived_tables</span><span class="p">:</span>
|
||||
</span><span id="L-87"><a href="#L-87"><span class="linenos"> 87</span></a> <span class="n">from_or_join</span> <span class="o">=</span> <span class="n">subquery</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">)</span>
|
||||
</span><span id="L-88"><a href="#L-88"><span class="linenos"> 88</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">subquery</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="L-89"><a href="#L-89"><span class="linenos"> 89</span></a> <span class="n">inner_scope</span> <span class="o">=</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">sources</span><span class="p">[</span><span class="n">alias</span><span class="p">]</span>
|
||||
</span><span id="L-90"><a href="#L-90"><span class="linenos"> 90</span></a> <span class="k">if</span> <span class="n">_mergeable</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">):</span>
|
||||
</span><span id="L-91"><a href="#L-91"><span class="linenos"> 91</span></a> <span class="n">_rename_inner_sources</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="L-92"><a href="#L-92"><span class="linenos"> 92</span></a> <span class="n">_merge_from</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">subquery</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="L-93"><a href="#L-93"><span class="linenos"> 93</span></a> <span class="n">_merge_expressions</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="L-94"><a href="#L-94"><span class="linenos"> 94</span></a> <span class="n">_merge_joins</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">)</span>
|
||||
</span><span id="L-95"><a href="#L-95"><span class="linenos"> 95</span></a> <span class="n">_merge_where</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">)</span>
|
||||
</span><span id="L-96"><a href="#L-96"><span class="linenos"> 96</span></a> <span class="n">_merge_order</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">)</span>
|
||||
</span><span id="L-97"><a href="#L-97"><span class="linenos"> 97</span></a> <span class="n">_merge_hints</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">)</span>
|
||||
</span><span id="L-98"><a href="#L-98"><span class="linenos"> 98</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">clear_cache</span><span class="p">()</span>
|
||||
</span><span id="L-99"><a href="#L-99"><span class="linenos"> 99</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-100"><a href="#L-100"><span class="linenos">100</span></a>
|
||||
</span><span id="L-101"><a href="#L-101"><span class="linenos">101</span></a>
|
||||
</span><span id="L-102"><a href="#L-102"><span class="linenos">102</span></a>
|
||||
</span><span id="L-103"><a href="#L-103"><span class="linenos">103</span></a><span class="k">def</span> <span class="nf">_mergeable</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">):</span>
|
||||
</span><span id="L-104"><a href="#L-104"><span class="linenos">104</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-105"><a href="#L-105"><span class="linenos">105</span></a><span class="sd"> Return True if `inner_select` can be merged into outer query.</span>
|
||||
</span><span id="L-106"><a href="#L-106"><span class="linenos">106</span></a>
|
||||
</span><span id="L-107"><a href="#L-107"><span class="linenos">107</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-108"><a href="#L-108"><span class="linenos">108</span></a><span class="sd"> outer_scope (Scope)</span>
|
||||
</span><span id="L-109"><a href="#L-109"><span class="linenos">109</span></a><span class="sd"> inner_scope (Scope)</span>
|
||||
</span><span id="L-110"><a href="#L-110"><span class="linenos">110</span></a><span class="sd"> leave_tables_isolated (bool)</span>
|
||||
</span><span id="L-111"><a href="#L-111"><span class="linenos">111</span></a><span class="sd"> from_or_join (exp.From|exp.Join)</span>
|
||||
</span><span id="L-112"><a href="#L-112"><span class="linenos">112</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="L-113"><a href="#L-113"><span class="linenos">113</span></a><span class="sd"> bool: True if can be merged</span>
|
||||
</span><span id="L-114"><a href="#L-114"><span class="linenos">114</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-115"><a href="#L-115"><span class="linenos">115</span></a> <span class="n">inner_select</span> <span class="o">=</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">unnest</span><span class="p">()</span>
|
||||
</span><span id="L-116"><a href="#L-116"><span class="linenos">116</span></a>
|
||||
</span><span id="L-117"><a href="#L-117"><span class="linenos">117</span></a> <span class="k">def</span> <span class="nf">_is_a_window_expression_in_unmergable_operation</span><span class="p">():</span>
|
||||
</span><span id="L-118"><a href="#L-118"><span class="linenos">118</span></a> <span class="n">window_expressions</span> <span class="o">=</span> <span class="n">inner_select</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Window</span><span class="p">)</span>
|
||||
</span><span id="L-119"><a href="#L-119"><span class="linenos">119</span></a> <span class="n">window_alias_names</span> <span class="o">=</span> <span class="p">{</span><span class="n">window</span><span class="o">.</span><span class="n">parent</span><span class="o">.</span><span class="n">alias_or_name</span> <span class="k">for</span> <span class="n">window</span> <span class="ow">in</span> <span class="n">window_expressions</span><span class="p">}</span>
|
||||
</span><span id="L-120"><a href="#L-120"><span class="linenos">120</span></a> <span class="n">inner_select_name</span> <span class="o">=</span> <span class="n">inner_select</span><span class="o">.</span><span class="n">parent</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="L-121"><a href="#L-121"><span class="linenos">121</span></a> <span class="n">unmergable_window_columns</span> <span class="o">=</span> <span class="p">[</span>
|
||||
</span><span id="L-122"><a href="#L-122"><span class="linenos">122</span></a> <span class="n">column</span>
|
||||
</span><span id="L-123"><a href="#L-123"><span class="linenos">123</span></a> <span class="k">for</span> <span class="n">column</span> <span class="ow">in</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">columns</span>
|
||||
</span><span id="L-124"><a href="#L-124"><span class="linenos">124</span></a> <span class="k">if</span> <span class="n">column</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span>
|
||||
</span><span id="L-125"><a href="#L-125"><span class="linenos">125</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">Where</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Group</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Order</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Having</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">AggFunc</span>
|
||||
</span><span id="L-126"><a href="#L-126"><span class="linenos">126</span></a> <span class="p">)</span>
|
||||
</span><span id="L-127"><a href="#L-127"><span class="linenos">127</span></a> <span class="p">]</span>
|
||||
</span><span id="L-128"><a href="#L-128"><span class="linenos">128</span></a> <span class="n">window_expressions_in_unmergable</span> <span class="o">=</span> <span class="p">[</span>
|
||||
</span><span id="L-129"><a href="#L-129"><span class="linenos">129</span></a> <span class="n">column</span>
|
||||
</span><span id="L-130"><a href="#L-130"><span class="linenos">130</span></a> <span class="k">for</span> <span class="n">column</span> <span class="ow">in</span> <span class="n">unmergable_window_columns</span>
|
||||
</span><span id="L-131"><a href="#L-131"><span class="linenos">131</span></a> <span class="k">if</span> <span class="n">column</span><span class="o">.</span><span class="n">table</span> <span class="o">==</span> <span class="n">inner_select_name</span> <span class="ow">and</span> <span class="n">column</span><span class="o">.</span><span class="n">name</span> <span class="ow">in</span> <span class="n">window_alias_names</span>
|
||||
</span><span id="L-132"><a href="#L-132"><span class="linenos">132</span></a> <span class="p">]</span>
|
||||
</span><span id="L-133"><a href="#L-133"><span class="linenos">133</span></a> <span class="k">return</span> <span class="nb">any</span><span class="p">(</span><span class="n">window_expressions_in_unmergable</span><span class="p">)</span>
|
||||
</span><span id="L-134"><a href="#L-134"><span class="linenos">134</span></a>
|
||||
</span><span id="L-135"><a href="#L-135"><span class="linenos">135</span></a> <span class="k">def</span> <span class="nf">_outer_select_joins_on_inner_select_join</span><span class="p">():</span>
|
||||
</span><span id="L-136"><a href="#L-136"><span class="linenos">136</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-137"><a href="#L-137"><span class="linenos">137</span></a><span class="sd"> All columns from the inner select in the ON clause must be from the first FROM table.</span>
|
||||
</span><span id="L-138"><a href="#L-138"><span class="linenos">138</span></a>
|
||||
</span><span id="L-139"><a href="#L-139"><span class="linenos">139</span></a><span class="sd"> That is, this can be merged:</span>
|
||||
</span><span id="L-140"><a href="#L-140"><span class="linenos">140</span></a><span class="sd"> SELECT * FROM x JOIN (SELECT y.a AS a FROM y JOIN z) AS q ON x.a = q.a</span>
|
||||
</span><span id="L-141"><a href="#L-141"><span class="linenos">141</span></a><span class="sd"> ^^^ ^</span>
|
||||
</span><span id="L-142"><a href="#L-142"><span class="linenos">142</span></a><span class="sd"> But this can't:</span>
|
||||
</span><span id="L-143"><a href="#L-143"><span class="linenos">143</span></a><span class="sd"> SELECT * FROM x JOIN (SELECT z.a AS a FROM y JOIN z) AS q ON x.a = q.a</span>
|
||||
</span><span id="L-144"><a href="#L-144"><span class="linenos">144</span></a><span class="sd"> ^^^ ^</span>
|
||||
</span><span id="L-145"><a href="#L-145"><span class="linenos">145</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-146"><a href="#L-146"><span class="linenos">146</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">from_or_join</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span>
|
||||
</span><span id="L-147"><a href="#L-147"><span class="linenos">147</span></a> <span class="k">return</span> <span class="kc">False</span>
|
||||
</span><span id="L-148"><a href="#L-148"><span class="linenos">148</span></a>
|
||||
</span><span id="L-149"><a href="#L-149"><span class="linenos">149</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">from_or_join</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="L-150"><a href="#L-150"><span class="linenos">150</span></a>
|
||||
</span><span id="L-151"><a href="#L-151"><span class="linenos">151</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">from_or_join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)</span>
|
||||
</span><span id="L-152"><a href="#L-152"><span class="linenos">152</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">on</span><span class="p">:</span>
|
||||
</span><span id="L-153"><a href="#L-153"><span class="linenos">153</span></a> <span class="k">return</span> <span class="kc">False</span>
|
||||
</span><span id="L-154"><a href="#L-154"><span class="linenos">154</span></a> <span class="n">selections</span> <span class="o">=</span> <span class="p">[</span><span class="n">c</span><span class="o">.</span><span class="n">name</span> <span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="n">on</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">)</span> <span class="k">if</span> <span class="n">c</span><span class="o">.</span><span class="n">table</span> <span class="o">==</span> <span class="n">alias</span><span class="p">]</span>
|
||||
</span><span id="L-155"><a href="#L-155"><span class="linenos">155</span></a> <span class="n">inner_from</span> <span class="o">=</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"from"</span><span class="p">)</span>
|
||||
</span><span id="L-156"><a href="#L-156"><span class="linenos">156</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">inner_from</span><span class="p">:</span>
|
||||
</span><span id="L-157"><a href="#L-157"><span class="linenos">157</span></a> <span class="k">return</span> <span class="kc">False</span>
|
||||
</span><span id="L-158"><a href="#L-158"><span class="linenos">158</span></a> <span class="n">inner_from_table</span> <span class="o">=</span> <span class="n">inner_from</span><span class="o">.</span><span class="n">expressions</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="L-159"><a href="#L-159"><span class="linenos">159</span></a> <span class="n">inner_projections</span> <span class="o">=</span> <span class="p">{</span><span class="n">s</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span> <span class="n">s</span> <span class="k">for</span> <span class="n">s</span> <span class="ow">in</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">selects</span><span class="p">}</span>
|
||||
</span><span id="L-160"><a href="#L-160"><span class="linenos">160</span></a> <span class="k">return</span> <span class="nb">any</span><span class="p">(</span>
|
||||
</span><span id="L-161"><a href="#L-161"><span class="linenos">161</span></a> <span class="n">col</span><span class="o">.</span><span class="n">table</span> <span class="o">!=</span> <span class="n">inner_from_table</span>
|
||||
</span><span id="L-162"><a href="#L-162"><span class="linenos">162</span></a> <span class="k">for</span> <span class="n">selection</span> <span class="ow">in</span> <span class="n">selections</span>
|
||||
</span><span id="L-163"><a href="#L-163"><span class="linenos">163</span></a> <span class="k">for</span> <span class="n">col</span> <span class="ow">in</span> <span class="n">inner_projections</span><span class="p">[</span><span class="n">selection</span><span class="p">]</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">)</span>
|
||||
</span><span id="L-164"><a href="#L-164"><span class="linenos">164</span></a> <span class="p">)</span>
|
||||
</span><span id="L-165"><a href="#L-165"><span class="linenos">165</span></a>
|
||||
</span><span id="L-166"><a href="#L-166"><span class="linenos">166</span></a> <span class="k">return</span> <span class="p">(</span>
|
||||
</span><span id="L-167"><a href="#L-167"><span class="linenos">167</span></a> <span class="nb">isinstance</span><span class="p">(</span><span class="n">outer_scope</span><span class="o">.</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">)</span>
|
||||
</span><span id="L-168"><a href="#L-168"><span class="linenos">168</span></a> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">inner_select</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">)</span>
|
||||
</span><span id="L-169"><a href="#L-169"><span class="linenos">169</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="nb">any</span><span class="p">(</span><span class="n">inner_select</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">arg</span><span class="p">)</span> <span class="k">for</span> <span class="n">arg</span> <span class="ow">in</span> <span class="n">UNMERGABLE_ARGS</span><span class="p">)</span>
|
||||
</span><span id="L-170"><a href="#L-170"><span class="linenos">170</span></a> <span class="ow">and</span> <span class="n">inner_select</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"from"</span><span class="p">)</span>
|
||||
</span><span id="L-171"><a href="#L-171"><span class="linenos">171</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="nb">any</span><span class="p">(</span><span class="n">e</span><span class="o">.</span><span class="n">find</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">AggFunc</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">)</span> <span class="k">for</span> <span class="n">e</span> <span class="ow">in</span> <span class="n">inner_select</span><span class="o">.</span><span class="n">expressions</span><span class="p">)</span>
|
||||
</span><span id="L-172"><a href="#L-172"><span class="linenos">172</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="p">(</span><span class="n">leave_tables_isolated</span> <span class="ow">and</span> <span class="nb">len</span><span class="p">(</span><span class="n">outer_scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="p">)</span> <span class="o">></span> <span class="mi">1</span><span class="p">)</span>
|
||||
</span><span id="L-173"><a href="#L-173"><span class="linenos">173</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="p">(</span>
|
||||
</span><span id="L-174"><a href="#L-174"><span class="linenos">174</span></a> <span class="nb">isinstance</span><span class="p">(</span><span class="n">from_or_join</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">)</span>
|
||||
</span><span id="L-175"><a href="#L-175"><span class="linenos">175</span></a> <span class="ow">and</span> <span class="n">inner_select</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"where"</span><span class="p">)</span>
|
||||
</span><span id="L-176"><a href="#L-176"><span class="linenos">176</span></a> <span class="ow">and</span> <span class="n">from_or_join</span><span class="o">.</span><span class="n">side</span> <span class="ow">in</span> <span class="p">{</span><span class="s2">"FULL"</span><span class="p">,</span> <span class="s2">"LEFT"</span><span class="p">,</span> <span class="s2">"RIGHT"</span><span class="p">}</span>
|
||||
</span><span id="L-177"><a href="#L-177"><span class="linenos">177</span></a> <span class="p">)</span>
|
||||
</span><span id="L-178"><a href="#L-178"><span class="linenos">178</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="p">(</span>
|
||||
</span><span id="L-179"><a href="#L-179"><span class="linenos">179</span></a> <span class="nb">isinstance</span><span class="p">(</span><span class="n">from_or_join</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">)</span>
|
||||
</span><span id="L-180"><a href="#L-180"><span class="linenos">180</span></a> <span class="ow">and</span> <span class="n">inner_select</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"where"</span><span class="p">)</span>
|
||||
</span><span id="L-181"><a href="#L-181"><span class="linenos">181</span></a> <span class="ow">and</span> <span class="nb">any</span><span class="p">(</span>
|
||||
</span><span id="L-182"><a href="#L-182"><span class="linenos">182</span></a> <span class="n">j</span><span class="o">.</span><span class="n">side</span> <span class="ow">in</span> <span class="p">{</span><span class="s2">"FULL"</span><span class="p">,</span> <span class="s2">"RIGHT"</span><span class="p">}</span> <span class="k">for</span> <span class="n">j</span> <span class="ow">in</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="p">[])</span>
|
||||
</span><span id="L-183"><a href="#L-183"><span class="linenos">183</span></a> <span class="p">)</span>
|
||||
</span><span id="L-184"><a href="#L-184"><span class="linenos">184</span></a> <span class="p">)</span>
|
||||
</span><span id="L-185"><a href="#L-185"><span class="linenos">185</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="n">_outer_select_joins_on_inner_select_join</span><span class="p">()</span>
|
||||
</span><span id="L-186"><a href="#L-186"><span class="linenos">186</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="n">_is_a_window_expression_in_unmergable_operation</span><span class="p">()</span>
|
||||
</span><span id="L-187"><a href="#L-187"><span class="linenos">187</span></a> <span class="p">)</span>
|
||||
</span><span id="L-102"><a href="#L-102"><span class="linenos">102</span></a><span class="k">def</span> <span class="nf">_mergeable</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">):</span>
|
||||
</span><span id="L-103"><a href="#L-103"><span class="linenos">103</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-104"><a href="#L-104"><span class="linenos">104</span></a><span class="sd"> Return True if `inner_select` can be merged into outer query.</span>
|
||||
</span><span id="L-105"><a href="#L-105"><span class="linenos">105</span></a>
|
||||
</span><span id="L-106"><a href="#L-106"><span class="linenos">106</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-107"><a href="#L-107"><span class="linenos">107</span></a><span class="sd"> outer_scope (Scope)</span>
|
||||
</span><span id="L-108"><a href="#L-108"><span class="linenos">108</span></a><span class="sd"> inner_scope (Scope)</span>
|
||||
</span><span id="L-109"><a href="#L-109"><span class="linenos">109</span></a><span class="sd"> leave_tables_isolated (bool)</span>
|
||||
</span><span id="L-110"><a href="#L-110"><span class="linenos">110</span></a><span class="sd"> from_or_join (exp.From|exp.Join)</span>
|
||||
</span><span id="L-111"><a href="#L-111"><span class="linenos">111</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="L-112"><a href="#L-112"><span class="linenos">112</span></a><span class="sd"> bool: True if can be merged</span>
|
||||
</span><span id="L-113"><a href="#L-113"><span class="linenos">113</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-114"><a href="#L-114"><span class="linenos">114</span></a> <span class="n">inner_select</span> <span class="o">=</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">unnest</span><span class="p">()</span>
|
||||
</span><span id="L-115"><a href="#L-115"><span class="linenos">115</span></a>
|
||||
</span><span id="L-116"><a href="#L-116"><span class="linenos">116</span></a> <span class="k">def</span> <span class="nf">_is_a_window_expression_in_unmergable_operation</span><span class="p">():</span>
|
||||
</span><span id="L-117"><a href="#L-117"><span class="linenos">117</span></a> <span class="n">window_expressions</span> <span class="o">=</span> <span class="n">inner_select</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Window</span><span class="p">)</span>
|
||||
</span><span id="L-118"><a href="#L-118"><span class="linenos">118</span></a> <span class="n">window_alias_names</span> <span class="o">=</span> <span class="p">{</span><span class="n">window</span><span class="o">.</span><span class="n">parent</span><span class="o">.</span><span class="n">alias_or_name</span> <span class="k">for</span> <span class="n">window</span> <span class="ow">in</span> <span class="n">window_expressions</span><span class="p">}</span>
|
||||
</span><span id="L-119"><a href="#L-119"><span class="linenos">119</span></a> <span class="n">inner_select_name</span> <span class="o">=</span> <span class="n">inner_select</span><span class="o">.</span><span class="n">parent</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="L-120"><a href="#L-120"><span class="linenos">120</span></a> <span class="n">unmergable_window_columns</span> <span class="o">=</span> <span class="p">[</span>
|
||||
</span><span id="L-121"><a href="#L-121"><span class="linenos">121</span></a> <span class="n">column</span>
|
||||
</span><span id="L-122"><a href="#L-122"><span class="linenos">122</span></a> <span class="k">for</span> <span class="n">column</span> <span class="ow">in</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">columns</span>
|
||||
</span><span id="L-123"><a href="#L-123"><span class="linenos">123</span></a> <span class="k">if</span> <span class="n">column</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span>
|
||||
</span><span id="L-124"><a href="#L-124"><span class="linenos">124</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">Where</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Group</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Order</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Having</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">AggFunc</span>
|
||||
</span><span id="L-125"><a href="#L-125"><span class="linenos">125</span></a> <span class="p">)</span>
|
||||
</span><span id="L-126"><a href="#L-126"><span class="linenos">126</span></a> <span class="p">]</span>
|
||||
</span><span id="L-127"><a href="#L-127"><span class="linenos">127</span></a> <span class="n">window_expressions_in_unmergable</span> <span class="o">=</span> <span class="p">[</span>
|
||||
</span><span id="L-128"><a href="#L-128"><span class="linenos">128</span></a> <span class="n">column</span>
|
||||
</span><span id="L-129"><a href="#L-129"><span class="linenos">129</span></a> <span class="k">for</span> <span class="n">column</span> <span class="ow">in</span> <span class="n">unmergable_window_columns</span>
|
||||
</span><span id="L-130"><a href="#L-130"><span class="linenos">130</span></a> <span class="k">if</span> <span class="n">column</span><span class="o">.</span><span class="n">table</span> <span class="o">==</span> <span class="n">inner_select_name</span> <span class="ow">and</span> <span class="n">column</span><span class="o">.</span><span class="n">name</span> <span class="ow">in</span> <span class="n">window_alias_names</span>
|
||||
</span><span id="L-131"><a href="#L-131"><span class="linenos">131</span></a> <span class="p">]</span>
|
||||
</span><span id="L-132"><a href="#L-132"><span class="linenos">132</span></a> <span class="k">return</span> <span class="nb">any</span><span class="p">(</span><span class="n">window_expressions_in_unmergable</span><span class="p">)</span>
|
||||
</span><span id="L-133"><a href="#L-133"><span class="linenos">133</span></a>
|
||||
</span><span id="L-134"><a href="#L-134"><span class="linenos">134</span></a> <span class="k">def</span> <span class="nf">_outer_select_joins_on_inner_select_join</span><span class="p">():</span>
|
||||
</span><span id="L-135"><a href="#L-135"><span class="linenos">135</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-136"><a href="#L-136"><span class="linenos">136</span></a><span class="sd"> All columns from the inner select in the ON clause must be from the first FROM table.</span>
|
||||
</span><span id="L-137"><a href="#L-137"><span class="linenos">137</span></a>
|
||||
</span><span id="L-138"><a href="#L-138"><span class="linenos">138</span></a><span class="sd"> That is, this can be merged:</span>
|
||||
</span><span id="L-139"><a href="#L-139"><span class="linenos">139</span></a><span class="sd"> SELECT * FROM x JOIN (SELECT y.a AS a FROM y JOIN z) AS q ON x.a = q.a</span>
|
||||
</span><span id="L-140"><a href="#L-140"><span class="linenos">140</span></a><span class="sd"> ^^^ ^</span>
|
||||
</span><span id="L-141"><a href="#L-141"><span class="linenos">141</span></a><span class="sd"> But this can't:</span>
|
||||
</span><span id="L-142"><a href="#L-142"><span class="linenos">142</span></a><span class="sd"> SELECT * FROM x JOIN (SELECT z.a AS a FROM y JOIN z) AS q ON x.a = q.a</span>
|
||||
</span><span id="L-143"><a href="#L-143"><span class="linenos">143</span></a><span class="sd"> ^^^ ^</span>
|
||||
</span><span id="L-144"><a href="#L-144"><span class="linenos">144</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-145"><a href="#L-145"><span class="linenos">145</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">from_or_join</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span>
|
||||
</span><span id="L-146"><a href="#L-146"><span class="linenos">146</span></a> <span class="k">return</span> <span class="kc">False</span>
|
||||
</span><span id="L-147"><a href="#L-147"><span class="linenos">147</span></a>
|
||||
</span><span id="L-148"><a href="#L-148"><span class="linenos">148</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">from_or_join</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="L-149"><a href="#L-149"><span class="linenos">149</span></a>
|
||||
</span><span id="L-150"><a href="#L-150"><span class="linenos">150</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">from_or_join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)</span>
|
||||
</span><span id="L-151"><a href="#L-151"><span class="linenos">151</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">on</span><span class="p">:</span>
|
||||
</span><span id="L-152"><a href="#L-152"><span class="linenos">152</span></a> <span class="k">return</span> <span class="kc">False</span>
|
||||
</span><span id="L-153"><a href="#L-153"><span class="linenos">153</span></a> <span class="n">selections</span> <span class="o">=</span> <span class="p">[</span><span class="n">c</span><span class="o">.</span><span class="n">name</span> <span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="n">on</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">)</span> <span class="k">if</span> <span class="n">c</span><span class="o">.</span><span class="n">table</span> <span class="o">==</span> <span class="n">alias</span><span class="p">]</span>
|
||||
</span><span id="L-154"><a href="#L-154"><span class="linenos">154</span></a> <span class="n">inner_from</span> <span class="o">=</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"from"</span><span class="p">)</span>
|
||||
</span><span id="L-155"><a href="#L-155"><span class="linenos">155</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">inner_from</span><span class="p">:</span>
|
||||
</span><span id="L-156"><a href="#L-156"><span class="linenos">156</span></a> <span class="k">return</span> <span class="kc">False</span>
|
||||
</span><span id="L-157"><a href="#L-157"><span class="linenos">157</span></a> <span class="n">inner_from_table</span> <span class="o">=</span> <span class="n">inner_from</span><span class="o">.</span><span class="n">expressions</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="L-158"><a href="#L-158"><span class="linenos">158</span></a> <span class="n">inner_projections</span> <span class="o">=</span> <span class="p">{</span><span class="n">s</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span> <span class="n">s</span> <span class="k">for</span> <span class="n">s</span> <span class="ow">in</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">selects</span><span class="p">}</span>
|
||||
</span><span id="L-159"><a href="#L-159"><span class="linenos">159</span></a> <span class="k">return</span> <span class="nb">any</span><span class="p">(</span>
|
||||
</span><span id="L-160"><a href="#L-160"><span class="linenos">160</span></a> <span class="n">col</span><span class="o">.</span><span class="n">table</span> <span class="o">!=</span> <span class="n">inner_from_table</span>
|
||||
</span><span id="L-161"><a href="#L-161"><span class="linenos">161</span></a> <span class="k">for</span> <span class="n">selection</span> <span class="ow">in</span> <span class="n">selections</span>
|
||||
</span><span id="L-162"><a href="#L-162"><span class="linenos">162</span></a> <span class="k">for</span> <span class="n">col</span> <span class="ow">in</span> <span class="n">inner_projections</span><span class="p">[</span><span class="n">selection</span><span class="p">]</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">)</span>
|
||||
</span><span id="L-163"><a href="#L-163"><span class="linenos">163</span></a> <span class="p">)</span>
|
||||
</span><span id="L-164"><a href="#L-164"><span class="linenos">164</span></a>
|
||||
</span><span id="L-165"><a href="#L-165"><span class="linenos">165</span></a> <span class="k">return</span> <span class="p">(</span>
|
||||
</span><span id="L-166"><a href="#L-166"><span class="linenos">166</span></a> <span class="nb">isinstance</span><span class="p">(</span><span class="n">outer_scope</span><span class="o">.</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">)</span>
|
||||
</span><span id="L-167"><a href="#L-167"><span class="linenos">167</span></a> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">inner_select</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">)</span>
|
||||
</span><span id="L-168"><a href="#L-168"><span class="linenos">168</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="nb">any</span><span class="p">(</span><span class="n">inner_select</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">arg</span><span class="p">)</span> <span class="k">for</span> <span class="n">arg</span> <span class="ow">in</span> <span class="n">UNMERGABLE_ARGS</span><span class="p">)</span>
|
||||
</span><span id="L-169"><a href="#L-169"><span class="linenos">169</span></a> <span class="ow">and</span> <span class="n">inner_select</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"from"</span><span class="p">)</span>
|
||||
</span><span id="L-170"><a href="#L-170"><span class="linenos">170</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="nb">any</span><span class="p">(</span><span class="n">e</span><span class="o">.</span><span class="n">find</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">AggFunc</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">)</span> <span class="k">for</span> <span class="n">e</span> <span class="ow">in</span> <span class="n">inner_select</span><span class="o">.</span><span class="n">expressions</span><span class="p">)</span>
|
||||
</span><span id="L-171"><a href="#L-171"><span class="linenos">171</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="p">(</span><span class="n">leave_tables_isolated</span> <span class="ow">and</span> <span class="nb">len</span><span class="p">(</span><span class="n">outer_scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="p">)</span> <span class="o">></span> <span class="mi">1</span><span class="p">)</span>
|
||||
</span><span id="L-172"><a href="#L-172"><span class="linenos">172</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="p">(</span>
|
||||
</span><span id="L-173"><a href="#L-173"><span class="linenos">173</span></a> <span class="nb">isinstance</span><span class="p">(</span><span class="n">from_or_join</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">)</span>
|
||||
</span><span id="L-174"><a href="#L-174"><span class="linenos">174</span></a> <span class="ow">and</span> <span class="n">inner_select</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"where"</span><span class="p">)</span>
|
||||
</span><span id="L-175"><a href="#L-175"><span class="linenos">175</span></a> <span class="ow">and</span> <span class="n">from_or_join</span><span class="o">.</span><span class="n">side</span> <span class="ow">in</span> <span class="p">{</span><span class="s2">"FULL"</span><span class="p">,</span> <span class="s2">"LEFT"</span><span class="p">,</span> <span class="s2">"RIGHT"</span><span class="p">}</span>
|
||||
</span><span id="L-176"><a href="#L-176"><span class="linenos">176</span></a> <span class="p">)</span>
|
||||
</span><span id="L-177"><a href="#L-177"><span class="linenos">177</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="p">(</span>
|
||||
</span><span id="L-178"><a href="#L-178"><span class="linenos">178</span></a> <span class="nb">isinstance</span><span class="p">(</span><span class="n">from_or_join</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">)</span>
|
||||
</span><span id="L-179"><a href="#L-179"><span class="linenos">179</span></a> <span class="ow">and</span> <span class="n">inner_select</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"where"</span><span class="p">)</span>
|
||||
</span><span id="L-180"><a href="#L-180"><span class="linenos">180</span></a> <span class="ow">and</span> <span class="nb">any</span><span class="p">(</span>
|
||||
</span><span id="L-181"><a href="#L-181"><span class="linenos">181</span></a> <span class="n">j</span><span class="o">.</span><span class="n">side</span> <span class="ow">in</span> <span class="p">{</span><span class="s2">"FULL"</span><span class="p">,</span> <span class="s2">"RIGHT"</span><span class="p">}</span> <span class="k">for</span> <span class="n">j</span> <span class="ow">in</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="p">[])</span>
|
||||
</span><span id="L-182"><a href="#L-182"><span class="linenos">182</span></a> <span class="p">)</span>
|
||||
</span><span id="L-183"><a href="#L-183"><span class="linenos">183</span></a> <span class="p">)</span>
|
||||
</span><span id="L-184"><a href="#L-184"><span class="linenos">184</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="n">_outer_select_joins_on_inner_select_join</span><span class="p">()</span>
|
||||
</span><span id="L-185"><a href="#L-185"><span class="linenos">185</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="n">_is_a_window_expression_in_unmergable_operation</span><span class="p">()</span>
|
||||
</span><span id="L-186"><a href="#L-186"><span class="linenos">186</span></a> <span class="p">)</span>
|
||||
</span><span id="L-187"><a href="#L-187"><span class="linenos">187</span></a>
|
||||
</span><span id="L-188"><a href="#L-188"><span class="linenos">188</span></a>
|
||||
</span><span id="L-189"><a href="#L-189"><span class="linenos">189</span></a>
|
||||
</span><span id="L-190"><a href="#L-190"><span class="linenos">190</span></a><span class="k">def</span> <span class="nf">_rename_inner_sources</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">alias</span><span class="p">):</span>
|
||||
</span><span id="L-191"><a href="#L-191"><span class="linenos">191</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-192"><a href="#L-192"><span class="linenos">192</span></a><span class="sd"> Renames any sources in the inner query that conflict with names in the outer query.</span>
|
||||
</span><span id="L-193"><a href="#L-193"><span class="linenos">193</span></a>
|
||||
</span><span id="L-194"><a href="#L-194"><span class="linenos">194</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-195"><a href="#L-195"><span class="linenos">195</span></a><span class="sd"> outer_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-196"><a href="#L-196"><span class="linenos">196</span></a><span class="sd"> inner_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-197"><a href="#L-197"><span class="linenos">197</span></a><span class="sd"> alias (str)</span>
|
||||
</span><span id="L-198"><a href="#L-198"><span class="linenos">198</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-199"><a href="#L-199"><span class="linenos">199</span></a> <span class="n">taken</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">outer_scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="p">)</span>
|
||||
</span><span id="L-200"><a href="#L-200"><span class="linenos">200</span></a> <span class="n">conflicts</span> <span class="o">=</span> <span class="n">taken</span><span class="o">.</span><span class="n">intersection</span><span class="p">(</span><span class="nb">set</span><span class="p">(</span><span class="n">inner_scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="p">))</span>
|
||||
</span><span id="L-201"><a href="#L-201"><span class="linenos">201</span></a> <span class="n">conflicts</span> <span class="o">-=</span> <span class="p">{</span><span class="n">alias</span><span class="p">}</span>
|
||||
</span><span id="L-202"><a href="#L-202"><span class="linenos">202</span></a>
|
||||
</span><span id="L-203"><a href="#L-203"><span class="linenos">203</span></a> <span class="k">for</span> <span class="n">conflict</span> <span class="ow">in</span> <span class="n">conflicts</span><span class="p">:</span>
|
||||
</span><span id="L-204"><a href="#L-204"><span class="linenos">204</span></a> <span class="n">new_name</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">taken</span><span class="p">,</span> <span class="n">conflict</span><span class="p">)</span>
|
||||
</span><span id="L-205"><a href="#L-205"><span class="linenos">205</span></a>
|
||||
</span><span id="L-206"><a href="#L-206"><span class="linenos">206</span></a> <span class="n">source</span><span class="p">,</span> <span class="n">_</span> <span class="o">=</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="p">[</span><span class="n">conflict</span><span class="p">]</span>
|
||||
</span><span id="L-207"><a href="#L-207"><span class="linenos">207</span></a> <span class="n">new_alias</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">new_name</span><span class="p">)</span>
|
||||
</span><span id="L-208"><a href="#L-208"><span class="linenos">208</span></a>
|
||||
</span><span id="L-209"><a href="#L-209"><span class="linenos">209</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Subquery</span><span class="p">):</span>
|
||||
</span><span id="L-210"><a href="#L-210"><span class="linenos">210</span></a> <span class="n">source</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"alias"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">TableAlias</span><span class="p">(</span><span class="n">this</span><span class="o">=</span><span class="n">new_alias</span><span class="p">))</span>
|
||||
</span><span id="L-211"><a href="#L-211"><span class="linenos">211</span></a> <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Table</span><span class="p">)</span> <span class="ow">and</span> <span class="n">source</span><span class="o">.</span><span class="n">alias</span><span class="p">:</span>
|
||||
</span><span id="L-212"><a href="#L-212"><span class="linenos">212</span></a> <span class="n">source</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"alias"</span><span class="p">,</span> <span class="n">new_alias</span><span class="p">)</span>
|
||||
</span><span id="L-213"><a href="#L-213"><span class="linenos">213</span></a> <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Table</span><span class="p">):</span>
|
||||
</span><span id="L-214"><a href="#L-214"><span class="linenos">214</span></a> <span class="n">source</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">alias_</span><span class="p">(</span><span class="n">source</span><span class="o">.</span><span class="n">copy</span><span class="p">(),</span> <span class="n">new_alias</span><span class="p">))</span>
|
||||
</span><span id="L-215"><a href="#L-215"><span class="linenos">215</span></a>
|
||||
</span><span id="L-216"><a href="#L-216"><span class="linenos">216</span></a> <span class="k">for</span> <span class="n">column</span> <span class="ow">in</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">source_columns</span><span class="p">(</span><span class="n">conflict</span><span class="p">):</span>
|
||||
</span><span id="L-217"><a href="#L-217"><span class="linenos">217</span></a> <span class="n">column</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"table"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">new_name</span><span class="p">))</span>
|
||||
</span><span id="L-218"><a href="#L-218"><span class="linenos">218</span></a>
|
||||
</span><span id="L-219"><a href="#L-219"><span class="linenos">219</span></a> <span class="n">inner_scope</span><span class="o">.</span><span class="n">rename_source</span><span class="p">(</span><span class="n">conflict</span><span class="p">,</span> <span class="n">new_name</span><span class="p">)</span>
|
||||
</span><span id="L-189"><a href="#L-189"><span class="linenos">189</span></a><span class="k">def</span> <span class="nf">_rename_inner_sources</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">alias</span><span class="p">):</span>
|
||||
</span><span id="L-190"><a href="#L-190"><span class="linenos">190</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-191"><a href="#L-191"><span class="linenos">191</span></a><span class="sd"> Renames any sources in the inner query that conflict with names in the outer query.</span>
|
||||
</span><span id="L-192"><a href="#L-192"><span class="linenos">192</span></a>
|
||||
</span><span id="L-193"><a href="#L-193"><span class="linenos">193</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-194"><a href="#L-194"><span class="linenos">194</span></a><span class="sd"> outer_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-195"><a href="#L-195"><span class="linenos">195</span></a><span class="sd"> inner_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-196"><a href="#L-196"><span class="linenos">196</span></a><span class="sd"> alias (str)</span>
|
||||
</span><span id="L-197"><a href="#L-197"><span class="linenos">197</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-198"><a href="#L-198"><span class="linenos">198</span></a> <span class="n">taken</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">outer_scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="p">)</span>
|
||||
</span><span id="L-199"><a href="#L-199"><span class="linenos">199</span></a> <span class="n">conflicts</span> <span class="o">=</span> <span class="n">taken</span><span class="o">.</span><span class="n">intersection</span><span class="p">(</span><span class="nb">set</span><span class="p">(</span><span class="n">inner_scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="p">))</span>
|
||||
</span><span id="L-200"><a href="#L-200"><span class="linenos">200</span></a> <span class="n">conflicts</span> <span class="o">-=</span> <span class="p">{</span><span class="n">alias</span><span class="p">}</span>
|
||||
</span><span id="L-201"><a href="#L-201"><span class="linenos">201</span></a>
|
||||
</span><span id="L-202"><a href="#L-202"><span class="linenos">202</span></a> <span class="k">for</span> <span class="n">conflict</span> <span class="ow">in</span> <span class="n">conflicts</span><span class="p">:</span>
|
||||
</span><span id="L-203"><a href="#L-203"><span class="linenos">203</span></a> <span class="n">new_name</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">taken</span><span class="p">,</span> <span class="n">conflict</span><span class="p">)</span>
|
||||
</span><span id="L-204"><a href="#L-204"><span class="linenos">204</span></a>
|
||||
</span><span id="L-205"><a href="#L-205"><span class="linenos">205</span></a> <span class="n">source</span><span class="p">,</span> <span class="n">_</span> <span class="o">=</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="p">[</span><span class="n">conflict</span><span class="p">]</span>
|
||||
</span><span id="L-206"><a href="#L-206"><span class="linenos">206</span></a> <span class="n">new_alias</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">new_name</span><span class="p">)</span>
|
||||
</span><span id="L-207"><a href="#L-207"><span class="linenos">207</span></a>
|
||||
</span><span id="L-208"><a href="#L-208"><span class="linenos">208</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Subquery</span><span class="p">):</span>
|
||||
</span><span id="L-209"><a href="#L-209"><span class="linenos">209</span></a> <span class="n">source</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"alias"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">TableAlias</span><span class="p">(</span><span class="n">this</span><span class="o">=</span><span class="n">new_alias</span><span class="p">))</span>
|
||||
</span><span id="L-210"><a href="#L-210"><span class="linenos">210</span></a> <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Table</span><span class="p">)</span> <span class="ow">and</span> <span class="n">source</span><span class="o">.</span><span class="n">alias</span><span class="p">:</span>
|
||||
</span><span id="L-211"><a href="#L-211"><span class="linenos">211</span></a> <span class="n">source</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"alias"</span><span class="p">,</span> <span class="n">new_alias</span><span class="p">)</span>
|
||||
</span><span id="L-212"><a href="#L-212"><span class="linenos">212</span></a> <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Table</span><span class="p">):</span>
|
||||
</span><span id="L-213"><a href="#L-213"><span class="linenos">213</span></a> <span class="n">source</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">alias_</span><span class="p">(</span><span class="n">source</span><span class="o">.</span><span class="n">copy</span><span class="p">(),</span> <span class="n">new_alias</span><span class="p">))</span>
|
||||
</span><span id="L-214"><a href="#L-214"><span class="linenos">214</span></a>
|
||||
</span><span id="L-215"><a href="#L-215"><span class="linenos">215</span></a> <span class="k">for</span> <span class="n">column</span> <span class="ow">in</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">source_columns</span><span class="p">(</span><span class="n">conflict</span><span class="p">):</span>
|
||||
</span><span id="L-216"><a href="#L-216"><span class="linenos">216</span></a> <span class="n">column</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"table"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">new_name</span><span class="p">))</span>
|
||||
</span><span id="L-217"><a href="#L-217"><span class="linenos">217</span></a>
|
||||
</span><span id="L-218"><a href="#L-218"><span class="linenos">218</span></a> <span class="n">inner_scope</span><span class="o">.</span><span class="n">rename_source</span><span class="p">(</span><span class="n">conflict</span><span class="p">,</span> <span class="n">new_name</span><span class="p">)</span>
|
||||
</span><span id="L-219"><a href="#L-219"><span class="linenos">219</span></a>
|
||||
</span><span id="L-220"><a href="#L-220"><span class="linenos">220</span></a>
|
||||
</span><span id="L-221"><a href="#L-221"><span class="linenos">221</span></a>
|
||||
</span><span id="L-222"><a href="#L-222"><span class="linenos">222</span></a><span class="k">def</span> <span class="nf">_merge_from</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">node_to_replace</span><span class="p">,</span> <span class="n">alias</span><span class="p">):</span>
|
||||
</span><span id="L-223"><a href="#L-223"><span class="linenos">223</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-224"><a href="#L-224"><span class="linenos">224</span></a><span class="sd"> Merge FROM clause of inner query into outer query.</span>
|
||||
</span><span id="L-225"><a href="#L-225"><span class="linenos">225</span></a>
|
||||
</span><span id="L-226"><a href="#L-226"><span class="linenos">226</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-227"><a href="#L-227"><span class="linenos">227</span></a><span class="sd"> outer_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-228"><a href="#L-228"><span class="linenos">228</span></a><span class="sd"> inner_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-229"><a href="#L-229"><span class="linenos">229</span></a><span class="sd"> node_to_replace (exp.Subquery|exp.Table)</span>
|
||||
</span><span id="L-230"><a href="#L-230"><span class="linenos">230</span></a><span class="sd"> alias (str)</span>
|
||||
</span><span id="L-231"><a href="#L-231"><span class="linenos">231</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-232"><a href="#L-232"><span class="linenos">232</span></a> <span class="n">new_subquery</span> <span class="o">=</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"from"</span><span class="p">)</span><span class="o">.</span><span class="n">expressions</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
|
||||
</span><span id="L-233"><a href="#L-233"><span class="linenos">233</span></a> <span class="n">node_to_replace</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">new_subquery</span><span class="p">)</span>
|
||||
</span><span id="L-234"><a href="#L-234"><span class="linenos">234</span></a> <span class="k">for</span> <span class="n">join_hint</span> <span class="ow">in</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">join_hints</span><span class="p">:</span>
|
||||
</span><span id="L-235"><a href="#L-235"><span class="linenos">235</span></a> <span class="n">tables</span> <span class="o">=</span> <span class="n">join_hint</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Table</span><span class="p">)</span>
|
||||
</span><span id="L-236"><a href="#L-236"><span class="linenos">236</span></a> <span class="k">for</span> <span class="n">table</span> <span class="ow">in</span> <span class="n">tables</span><span class="p">:</span>
|
||||
</span><span id="L-237"><a href="#L-237"><span class="linenos">237</span></a> <span class="k">if</span> <span class="n">table</span><span class="o">.</span><span class="n">alias_or_name</span> <span class="o">==</span> <span class="n">node_to_replace</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span>
|
||||
</span><span id="L-238"><a href="#L-238"><span class="linenos">238</span></a> <span class="n">table</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"this"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">new_subquery</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">))</span>
|
||||
</span><span id="L-239"><a href="#L-239"><span class="linenos">239</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">remove_source</span><span class="p">(</span><span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="L-240"><a href="#L-240"><span class="linenos">240</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">add_source</span><span class="p">(</span>
|
||||
</span><span id="L-241"><a href="#L-241"><span class="linenos">241</span></a> <span class="n">new_subquery</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">,</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">sources</span><span class="p">[</span><span class="n">new_subquery</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">]</span>
|
||||
</span><span id="L-242"><a href="#L-242"><span class="linenos">242</span></a> <span class="p">)</span>
|
||||
</span><span id="L-221"><a href="#L-221"><span class="linenos">221</span></a><span class="k">def</span> <span class="nf">_merge_from</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">node_to_replace</span><span class="p">,</span> <span class="n">alias</span><span class="p">):</span>
|
||||
</span><span id="L-222"><a href="#L-222"><span class="linenos">222</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-223"><a href="#L-223"><span class="linenos">223</span></a><span class="sd"> Merge FROM clause of inner query into outer query.</span>
|
||||
</span><span id="L-224"><a href="#L-224"><span class="linenos">224</span></a>
|
||||
</span><span id="L-225"><a href="#L-225"><span class="linenos">225</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-226"><a href="#L-226"><span class="linenos">226</span></a><span class="sd"> outer_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-227"><a href="#L-227"><span class="linenos">227</span></a><span class="sd"> inner_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-228"><a href="#L-228"><span class="linenos">228</span></a><span class="sd"> node_to_replace (exp.Subquery|exp.Table)</span>
|
||||
</span><span id="L-229"><a href="#L-229"><span class="linenos">229</span></a><span class="sd"> alias (str)</span>
|
||||
</span><span id="L-230"><a href="#L-230"><span class="linenos">230</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-231"><a href="#L-231"><span class="linenos">231</span></a> <span class="n">new_subquery</span> <span class="o">=</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"from"</span><span class="p">)</span><span class="o">.</span><span class="n">expressions</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
|
||||
</span><span id="L-232"><a href="#L-232"><span class="linenos">232</span></a> <span class="n">node_to_replace</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">new_subquery</span><span class="p">)</span>
|
||||
</span><span id="L-233"><a href="#L-233"><span class="linenos">233</span></a> <span class="k">for</span> <span class="n">join_hint</span> <span class="ow">in</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">join_hints</span><span class="p">:</span>
|
||||
</span><span id="L-234"><a href="#L-234"><span class="linenos">234</span></a> <span class="n">tables</span> <span class="o">=</span> <span class="n">join_hint</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Table</span><span class="p">)</span>
|
||||
</span><span id="L-235"><a href="#L-235"><span class="linenos">235</span></a> <span class="k">for</span> <span class="n">table</span> <span class="ow">in</span> <span class="n">tables</span><span class="p">:</span>
|
||||
</span><span id="L-236"><a href="#L-236"><span class="linenos">236</span></a> <span class="k">if</span> <span class="n">table</span><span class="o">.</span><span class="n">alias_or_name</span> <span class="o">==</span> <span class="n">node_to_replace</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span>
|
||||
</span><span id="L-237"><a href="#L-237"><span class="linenos">237</span></a> <span class="n">table</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"this"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">new_subquery</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">))</span>
|
||||
</span><span id="L-238"><a href="#L-238"><span class="linenos">238</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">remove_source</span><span class="p">(</span><span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="L-239"><a href="#L-239"><span class="linenos">239</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">add_source</span><span class="p">(</span>
|
||||
</span><span id="L-240"><a href="#L-240"><span class="linenos">240</span></a> <span class="n">new_subquery</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">,</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">sources</span><span class="p">[</span><span class="n">new_subquery</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">]</span>
|
||||
</span><span id="L-241"><a href="#L-241"><span class="linenos">241</span></a> <span class="p">)</span>
|
||||
</span><span id="L-242"><a href="#L-242"><span class="linenos">242</span></a>
|
||||
</span><span id="L-243"><a href="#L-243"><span class="linenos">243</span></a>
|
||||
</span><span id="L-244"><a href="#L-244"><span class="linenos">244</span></a>
|
||||
</span><span id="L-245"><a href="#L-245"><span class="linenos">245</span></a><span class="k">def</span> <span class="nf">_merge_joins</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">):</span>
|
||||
</span><span id="L-246"><a href="#L-246"><span class="linenos">246</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-247"><a href="#L-247"><span class="linenos">247</span></a><span class="sd"> Merge JOIN clauses of inner query into outer query.</span>
|
||||
</span><span id="L-248"><a href="#L-248"><span class="linenos">248</span></a>
|
||||
</span><span id="L-249"><a href="#L-249"><span class="linenos">249</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-250"><a href="#L-250"><span class="linenos">250</span></a><span class="sd"> outer_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-251"><a href="#L-251"><span class="linenos">251</span></a><span class="sd"> inner_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-252"><a href="#L-252"><span class="linenos">252</span></a><span class="sd"> from_or_join (exp.From|exp.Join)</span>
|
||||
</span><span id="L-253"><a href="#L-253"><span class="linenos">253</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-254"><a href="#L-254"><span class="linenos">254</span></a>
|
||||
</span><span id="L-255"><a href="#L-255"><span class="linenos">255</span></a> <span class="n">new_joins</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
</span><span id="L-256"><a href="#L-256"><span class="linenos">256</span></a> <span class="n">comma_joins</span> <span class="o">=</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"from"</span><span class="p">)</span><span class="o">.</span><span class="n">expressions</span><span class="p">[</span><span class="mi">1</span><span class="p">:]</span>
|
||||
</span><span id="L-257"><a href="#L-257"><span class="linenos">257</span></a> <span class="k">for</span> <span class="n">subquery</span> <span class="ow">in</span> <span class="n">comma_joins</span><span class="p">:</span>
|
||||
</span><span id="L-258"><a href="#L-258"><span class="linenos">258</span></a> <span class="n">new_joins</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">(</span><span class="n">this</span><span class="o">=</span><span class="n">subquery</span><span class="p">,</span> <span class="n">kind</span><span class="o">=</span><span class="s2">"CROSS"</span><span class="p">))</span>
|
||||
</span><span id="L-259"><a href="#L-259"><span class="linenos">259</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">add_source</span><span class="p">(</span><span class="n">subquery</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">,</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">sources</span><span class="p">[</span><span class="n">subquery</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">])</span>
|
||||
</span><span id="L-260"><a href="#L-260"><span class="linenos">260</span></a>
|
||||
</span><span id="L-261"><a href="#L-261"><span class="linenos">261</span></a> <span class="n">joins</span> <span class="o">=</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">)</span> <span class="ow">or</span> <span class="p">[]</span>
|
||||
</span><span id="L-262"><a href="#L-262"><span class="linenos">262</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">joins</span><span class="p">:</span>
|
||||
</span><span id="L-263"><a href="#L-263"><span class="linenos">263</span></a> <span class="n">new_joins</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">join</span><span class="p">)</span>
|
||||
</span><span id="L-264"><a href="#L-264"><span class="linenos">264</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">add_source</span><span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">,</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">sources</span><span class="p">[</span><span class="n">join</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">])</span>
|
||||
</span><span id="L-265"><a href="#L-265"><span class="linenos">265</span></a>
|
||||
</span><span id="L-266"><a href="#L-266"><span class="linenos">266</span></a> <span class="k">if</span> <span class="n">new_joins</span><span class="p">:</span>
|
||||
</span><span id="L-267"><a href="#L-267"><span class="linenos">267</span></a> <span class="n">outer_joins</span> <span class="o">=</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="p">[])</span>
|
||||
</span><span id="L-268"><a href="#L-268"><span class="linenos">268</span></a>
|
||||
</span><span id="L-269"><a href="#L-269"><span class="linenos">269</span></a> <span class="c1"># Maintain the join order</span>
|
||||
</span><span id="L-270"><a href="#L-270"><span class="linenos">270</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">from_or_join</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">):</span>
|
||||
</span><span id="L-271"><a href="#L-271"><span class="linenos">271</span></a> <span class="n">position</span> <span class="o">=</span> <span class="mi">0</span>
|
||||
</span><span id="L-272"><a href="#L-272"><span class="linenos">272</span></a> <span class="k">else</span><span class="p">:</span>
|
||||
</span><span id="L-273"><a href="#L-273"><span class="linenos">273</span></a> <span class="n">position</span> <span class="o">=</span> <span class="n">outer_joins</span><span class="o">.</span><span class="n">index</span><span class="p">(</span><span class="n">from_or_join</span><span class="p">)</span> <span class="o">+</span> <span class="mi">1</span>
|
||||
</span><span id="L-274"><a href="#L-274"><span class="linenos">274</span></a> <span class="n">outer_joins</span><span class="p">[</span><span class="n">position</span><span class="p">:</span><span class="n">position</span><span class="p">]</span> <span class="o">=</span> <span class="n">new_joins</span>
|
||||
</span><span id="L-275"><a href="#L-275"><span class="linenos">275</span></a>
|
||||
</span><span id="L-276"><a href="#L-276"><span class="linenos">276</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="n">outer_joins</span><span class="p">)</span>
|
||||
</span><span id="L-244"><a href="#L-244"><span class="linenos">244</span></a><span class="k">def</span> <span class="nf">_merge_joins</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">):</span>
|
||||
</span><span id="L-245"><a href="#L-245"><span class="linenos">245</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-246"><a href="#L-246"><span class="linenos">246</span></a><span class="sd"> Merge JOIN clauses of inner query into outer query.</span>
|
||||
</span><span id="L-247"><a href="#L-247"><span class="linenos">247</span></a>
|
||||
</span><span id="L-248"><a href="#L-248"><span class="linenos">248</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-249"><a href="#L-249"><span class="linenos">249</span></a><span class="sd"> outer_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-250"><a href="#L-250"><span class="linenos">250</span></a><span class="sd"> inner_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-251"><a href="#L-251"><span class="linenos">251</span></a><span class="sd"> from_or_join (exp.From|exp.Join)</span>
|
||||
</span><span id="L-252"><a href="#L-252"><span class="linenos">252</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-253"><a href="#L-253"><span class="linenos">253</span></a>
|
||||
</span><span id="L-254"><a href="#L-254"><span class="linenos">254</span></a> <span class="n">new_joins</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
</span><span id="L-255"><a href="#L-255"><span class="linenos">255</span></a> <span class="n">comma_joins</span> <span class="o">=</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"from"</span><span class="p">)</span><span class="o">.</span><span class="n">expressions</span><span class="p">[</span><span class="mi">1</span><span class="p">:]</span>
|
||||
</span><span id="L-256"><a href="#L-256"><span class="linenos">256</span></a> <span class="k">for</span> <span class="n">subquery</span> <span class="ow">in</span> <span class="n">comma_joins</span><span class="p">:</span>
|
||||
</span><span id="L-257"><a href="#L-257"><span class="linenos">257</span></a> <span class="n">new_joins</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">(</span><span class="n">this</span><span class="o">=</span><span class="n">subquery</span><span class="p">,</span> <span class="n">kind</span><span class="o">=</span><span class="s2">"CROSS"</span><span class="p">))</span>
|
||||
</span><span id="L-258"><a href="#L-258"><span class="linenos">258</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">add_source</span><span class="p">(</span><span class="n">subquery</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">,</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">sources</span><span class="p">[</span><span class="n">subquery</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">])</span>
|
||||
</span><span id="L-259"><a href="#L-259"><span class="linenos">259</span></a>
|
||||
</span><span id="L-260"><a href="#L-260"><span class="linenos">260</span></a> <span class="n">joins</span> <span class="o">=</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">)</span> <span class="ow">or</span> <span class="p">[]</span>
|
||||
</span><span id="L-261"><a href="#L-261"><span class="linenos">261</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">joins</span><span class="p">:</span>
|
||||
</span><span id="L-262"><a href="#L-262"><span class="linenos">262</span></a> <span class="n">new_joins</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">join</span><span class="p">)</span>
|
||||
</span><span id="L-263"><a href="#L-263"><span class="linenos">263</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">add_source</span><span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">,</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">sources</span><span class="p">[</span><span class="n">join</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">])</span>
|
||||
</span><span id="L-264"><a href="#L-264"><span class="linenos">264</span></a>
|
||||
</span><span id="L-265"><a href="#L-265"><span class="linenos">265</span></a> <span class="k">if</span> <span class="n">new_joins</span><span class="p">:</span>
|
||||
</span><span id="L-266"><a href="#L-266"><span class="linenos">266</span></a> <span class="n">outer_joins</span> <span class="o">=</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="p">[])</span>
|
||||
</span><span id="L-267"><a href="#L-267"><span class="linenos">267</span></a>
|
||||
</span><span id="L-268"><a href="#L-268"><span class="linenos">268</span></a> <span class="c1"># Maintain the join order</span>
|
||||
</span><span id="L-269"><a href="#L-269"><span class="linenos">269</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">from_or_join</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">):</span>
|
||||
</span><span id="L-270"><a href="#L-270"><span class="linenos">270</span></a> <span class="n">position</span> <span class="o">=</span> <span class="mi">0</span>
|
||||
</span><span id="L-271"><a href="#L-271"><span class="linenos">271</span></a> <span class="k">else</span><span class="p">:</span>
|
||||
</span><span id="L-272"><a href="#L-272"><span class="linenos">272</span></a> <span class="n">position</span> <span class="o">=</span> <span class="n">outer_joins</span><span class="o">.</span><span class="n">index</span><span class="p">(</span><span class="n">from_or_join</span><span class="p">)</span> <span class="o">+</span> <span class="mi">1</span>
|
||||
</span><span id="L-273"><a href="#L-273"><span class="linenos">273</span></a> <span class="n">outer_joins</span><span class="p">[</span><span class="n">position</span><span class="p">:</span><span class="n">position</span><span class="p">]</span> <span class="o">=</span> <span class="n">new_joins</span>
|
||||
</span><span id="L-274"><a href="#L-274"><span class="linenos">274</span></a>
|
||||
</span><span id="L-275"><a href="#L-275"><span class="linenos">275</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="n">outer_joins</span><span class="p">)</span>
|
||||
</span><span id="L-276"><a href="#L-276"><span class="linenos">276</span></a>
|
||||
</span><span id="L-277"><a href="#L-277"><span class="linenos">277</span></a>
|
||||
</span><span id="L-278"><a href="#L-278"><span class="linenos">278</span></a>
|
||||
</span><span id="L-279"><a href="#L-279"><span class="linenos">279</span></a><span class="k">def</span> <span class="nf">_merge_expressions</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">alias</span><span class="p">):</span>
|
||||
</span><span id="L-280"><a href="#L-280"><span class="linenos">280</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-281"><a href="#L-281"><span class="linenos">281</span></a><span class="sd"> Merge projections of inner query into outer query.</span>
|
||||
</span><span id="L-282"><a href="#L-282"><span class="linenos">282</span></a>
|
||||
</span><span id="L-283"><a href="#L-283"><span class="linenos">283</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-284"><a href="#L-284"><span class="linenos">284</span></a><span class="sd"> outer_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-285"><a href="#L-285"><span class="linenos">285</span></a><span class="sd"> inner_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-286"><a href="#L-286"><span class="linenos">286</span></a><span class="sd"> alias (str)</span>
|
||||
</span><span id="L-287"><a href="#L-287"><span class="linenos">287</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-288"><a href="#L-288"><span class="linenos">288</span></a> <span class="c1"># Collect all columns that reference the alias of the inner query</span>
|
||||
</span><span id="L-289"><a href="#L-289"><span class="linenos">289</span></a> <span class="n">outer_columns</span> <span class="o">=</span> <span class="n">defaultdict</span><span class="p">(</span><span class="nb">list</span><span class="p">)</span>
|
||||
</span><span id="L-290"><a href="#L-290"><span class="linenos">290</span></a> <span class="k">for</span> <span class="n">column</span> <span class="ow">in</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">columns</span><span class="p">:</span>
|
||||
</span><span id="L-291"><a href="#L-291"><span class="linenos">291</span></a> <span class="k">if</span> <span class="n">column</span><span class="o">.</span><span class="n">table</span> <span class="o">==</span> <span class="n">alias</span><span class="p">:</span>
|
||||
</span><span id="L-292"><a href="#L-292"><span class="linenos">292</span></a> <span class="n">outer_columns</span><span class="p">[</span><span class="n">column</span><span class="o">.</span><span class="n">name</span><span class="p">]</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">column</span><span class="p">)</span>
|
||||
</span><span id="L-293"><a href="#L-293"><span class="linenos">293</span></a>
|
||||
</span><span id="L-294"><a href="#L-294"><span class="linenos">294</span></a> <span class="c1"># Replace columns with the projection expression in the inner query</span>
|
||||
</span><span id="L-295"><a href="#L-295"><span class="linenos">295</span></a> <span class="k">for</span> <span class="n">expression</span> <span class="ow">in</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">expressions</span><span class="p">:</span>
|
||||
</span><span id="L-296"><a href="#L-296"><span class="linenos">296</span></a> <span class="n">projection_name</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="L-297"><a href="#L-297"><span class="linenos">297</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">projection_name</span><span class="p">:</span>
|
||||
</span><span id="L-298"><a href="#L-298"><span class="linenos">298</span></a> <span class="k">continue</span>
|
||||
</span><span id="L-299"><a href="#L-299"><span class="linenos">299</span></a> <span class="n">columns_to_replace</span> <span class="o">=</span> <span class="n">outer_columns</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">projection_name</span><span class="p">,</span> <span class="p">[])</span>
|
||||
</span><span id="L-300"><a href="#L-300"><span class="linenos">300</span></a> <span class="k">for</span> <span class="n">column</span> <span class="ow">in</span> <span class="n">columns_to_replace</span><span class="p">:</span>
|
||||
</span><span id="L-301"><a href="#L-301"><span class="linenos">301</span></a> <span class="n">column</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">unalias</span><span class="p">()</span><span class="o">.</span><span class="n">copy</span><span class="p">())</span>
|
||||
</span><span id="L-278"><a href="#L-278"><span class="linenos">278</span></a><span class="k">def</span> <span class="nf">_merge_expressions</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">alias</span><span class="p">):</span>
|
||||
</span><span id="L-279"><a href="#L-279"><span class="linenos">279</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-280"><a href="#L-280"><span class="linenos">280</span></a><span class="sd"> Merge projections of inner query into outer query.</span>
|
||||
</span><span id="L-281"><a href="#L-281"><span class="linenos">281</span></a>
|
||||
</span><span id="L-282"><a href="#L-282"><span class="linenos">282</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-283"><a href="#L-283"><span class="linenos">283</span></a><span class="sd"> outer_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-284"><a href="#L-284"><span class="linenos">284</span></a><span class="sd"> inner_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-285"><a href="#L-285"><span class="linenos">285</span></a><span class="sd"> alias (str)</span>
|
||||
</span><span id="L-286"><a href="#L-286"><span class="linenos">286</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-287"><a href="#L-287"><span class="linenos">287</span></a> <span class="c1"># Collect all columns that reference the alias of the inner query</span>
|
||||
</span><span id="L-288"><a href="#L-288"><span class="linenos">288</span></a> <span class="n">outer_columns</span> <span class="o">=</span> <span class="n">defaultdict</span><span class="p">(</span><span class="nb">list</span><span class="p">)</span>
|
||||
</span><span id="L-289"><a href="#L-289"><span class="linenos">289</span></a> <span class="k">for</span> <span class="n">column</span> <span class="ow">in</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">columns</span><span class="p">:</span>
|
||||
</span><span id="L-290"><a href="#L-290"><span class="linenos">290</span></a> <span class="k">if</span> <span class="n">column</span><span class="o">.</span><span class="n">table</span> <span class="o">==</span> <span class="n">alias</span><span class="p">:</span>
|
||||
</span><span id="L-291"><a href="#L-291"><span class="linenos">291</span></a> <span class="n">outer_columns</span><span class="p">[</span><span class="n">column</span><span class="o">.</span><span class="n">name</span><span class="p">]</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">column</span><span class="p">)</span>
|
||||
</span><span id="L-292"><a href="#L-292"><span class="linenos">292</span></a>
|
||||
</span><span id="L-293"><a href="#L-293"><span class="linenos">293</span></a> <span class="c1"># Replace columns with the projection expression in the inner query</span>
|
||||
</span><span id="L-294"><a href="#L-294"><span class="linenos">294</span></a> <span class="k">for</span> <span class="n">expression</span> <span class="ow">in</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">expressions</span><span class="p">:</span>
|
||||
</span><span id="L-295"><a href="#L-295"><span class="linenos">295</span></a> <span class="n">projection_name</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="L-296"><a href="#L-296"><span class="linenos">296</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">projection_name</span><span class="p">:</span>
|
||||
</span><span id="L-297"><a href="#L-297"><span class="linenos">297</span></a> <span class="k">continue</span>
|
||||
</span><span id="L-298"><a href="#L-298"><span class="linenos">298</span></a> <span class="n">columns_to_replace</span> <span class="o">=</span> <span class="n">outer_columns</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">projection_name</span><span class="p">,</span> <span class="p">[])</span>
|
||||
</span><span id="L-299"><a href="#L-299"><span class="linenos">299</span></a> <span class="k">for</span> <span class="n">column</span> <span class="ow">in</span> <span class="n">columns_to_replace</span><span class="p">:</span>
|
||||
</span><span id="L-300"><a href="#L-300"><span class="linenos">300</span></a> <span class="n">column</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">unalias</span><span class="p">()</span><span class="o">.</span><span class="n">copy</span><span class="p">())</span>
|
||||
</span><span id="L-301"><a href="#L-301"><span class="linenos">301</span></a>
|
||||
</span><span id="L-302"><a href="#L-302"><span class="linenos">302</span></a>
|
||||
</span><span id="L-303"><a href="#L-303"><span class="linenos">303</span></a>
|
||||
</span><span id="L-304"><a href="#L-304"><span class="linenos">304</span></a><span class="k">def</span> <span class="nf">_merge_where</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">):</span>
|
||||
</span><span id="L-305"><a href="#L-305"><span class="linenos">305</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-306"><a href="#L-306"><span class="linenos">306</span></a><span class="sd"> Merge WHERE clause of inner query into outer query.</span>
|
||||
</span><span id="L-307"><a href="#L-307"><span class="linenos">307</span></a>
|
||||
</span><span id="L-308"><a href="#L-308"><span class="linenos">308</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-309"><a href="#L-309"><span class="linenos">309</span></a><span class="sd"> outer_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-310"><a href="#L-310"><span class="linenos">310</span></a><span class="sd"> inner_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-311"><a href="#L-311"><span class="linenos">311</span></a><span class="sd"> from_or_join (exp.From|exp.Join)</span>
|
||||
</span><span id="L-312"><a href="#L-312"><span class="linenos">312</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-313"><a href="#L-313"><span class="linenos">313</span></a> <span class="n">where</span> <span class="o">=</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"where"</span><span class="p">)</span>
|
||||
</span><span id="L-314"><a href="#L-314"><span class="linenos">314</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">where</span> <span class="ow">or</span> <span class="ow">not</span> <span class="n">where</span><span class="o">.</span><span class="n">this</span><span class="p">:</span>
|
||||
</span><span id="L-315"><a href="#L-315"><span class="linenos">315</span></a> <span class="k">return</span>
|
||||
</span><span id="L-316"><a href="#L-316"><span class="linenos">316</span></a>
|
||||
</span><span id="L-317"><a href="#L-317"><span class="linenos">317</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">expression</span>
|
||||
</span><span id="L-318"><a href="#L-318"><span class="linenos">318</span></a>
|
||||
</span><span id="L-319"><a href="#L-319"><span class="linenos">319</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">from_or_join</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span>
|
||||
</span><span id="L-320"><a href="#L-320"><span class="linenos">320</span></a> <span class="c1"># Merge predicates from an outer join to the ON clause</span>
|
||||
</span><span id="L-321"><a href="#L-321"><span class="linenos">321</span></a> <span class="c1"># if it only has columns that are already joined</span>
|
||||
</span><span id="L-322"><a href="#L-322"><span class="linenos">322</span></a> <span class="n">from_</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"from"</span><span class="p">)</span>
|
||||
</span><span id="L-323"><a href="#L-323"><span class="linenos">323</span></a> <span class="n">sources</span> <span class="o">=</span> <span class="p">{</span><span class="n">table</span><span class="o">.</span><span class="n">alias_or_name</span> <span class="k">for</span> <span class="n">table</span> <span class="ow">in</span> <span class="n">from_</span><span class="o">.</span><span class="n">expressions</span><span class="p">}</span> <span class="k">if</span> <span class="n">from_</span> <span class="k">else</span> <span class="p">{}</span>
|
||||
</span><span id="L-324"><a href="#L-324"><span class="linenos">324</span></a>
|
||||
</span><span id="L-325"><a href="#L-325"><span class="linenos">325</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"joins"</span><span class="p">]:</span>
|
||||
</span><span id="L-326"><a href="#L-326"><span class="linenos">326</span></a> <span class="n">source</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="L-327"><a href="#L-327"><span class="linenos">327</span></a> <span class="n">sources</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">source</span><span class="p">)</span>
|
||||
</span><span id="L-328"><a href="#L-328"><span class="linenos">328</span></a> <span class="k">if</span> <span class="n">source</span> <span class="o">==</span> <span class="n">from_or_join</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span>
|
||||
</span><span id="L-329"><a href="#L-329"><span class="linenos">329</span></a> <span class="k">break</span>
|
||||
</span><span id="L-330"><a href="#L-330"><span class="linenos">330</span></a>
|
||||
</span><span id="L-331"><a href="#L-331"><span class="linenos">331</span></a> <span class="k">if</span> <span class="nb">set</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">where</span><span class="o">.</span><span class="n">this</span><span class="p">))</span> <span class="o"><=</span> <span class="n">sources</span><span class="p">:</span>
|
||||
</span><span id="L-332"><a href="#L-332"><span class="linenos">332</span></a> <span class="n">from_or_join</span><span class="o">.</span><span class="n">on</span><span class="p">(</span><span class="n">where</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
|
||||
</span><span id="L-333"><a href="#L-333"><span class="linenos">333</span></a> <span class="n">from_or_join</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"on"</span><span class="p">,</span> <span class="n">simplify</span><span class="p">(</span><span class="n">from_or_join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)))</span>
|
||||
</span><span id="L-334"><a href="#L-334"><span class="linenos">334</span></a> <span class="k">return</span>
|
||||
</span><span id="L-335"><a href="#L-335"><span class="linenos">335</span></a>
|
||||
</span><span id="L-336"><a href="#L-336"><span class="linenos">336</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">where</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
|
||||
</span><span id="L-337"><a href="#L-337"><span class="linenos">337</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"where"</span><span class="p">,</span> <span class="n">simplify</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"where"</span><span class="p">)))</span>
|
||||
</span><span id="L-303"><a href="#L-303"><span class="linenos">303</span></a><span class="k">def</span> <span class="nf">_merge_where</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">):</span>
|
||||
</span><span id="L-304"><a href="#L-304"><span class="linenos">304</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-305"><a href="#L-305"><span class="linenos">305</span></a><span class="sd"> Merge WHERE clause of inner query into outer query.</span>
|
||||
</span><span id="L-306"><a href="#L-306"><span class="linenos">306</span></a>
|
||||
</span><span id="L-307"><a href="#L-307"><span class="linenos">307</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-308"><a href="#L-308"><span class="linenos">308</span></a><span class="sd"> outer_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-309"><a href="#L-309"><span class="linenos">309</span></a><span class="sd"> inner_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-310"><a href="#L-310"><span class="linenos">310</span></a><span class="sd"> from_or_join (exp.From|exp.Join)</span>
|
||||
</span><span id="L-311"><a href="#L-311"><span class="linenos">311</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-312"><a href="#L-312"><span class="linenos">312</span></a> <span class="n">where</span> <span class="o">=</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"where"</span><span class="p">)</span>
|
||||
</span><span id="L-313"><a href="#L-313"><span class="linenos">313</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">where</span> <span class="ow">or</span> <span class="ow">not</span> <span class="n">where</span><span class="o">.</span><span class="n">this</span><span class="p">:</span>
|
||||
</span><span id="L-314"><a href="#L-314"><span class="linenos">314</span></a> <span class="k">return</span>
|
||||
</span><span id="L-315"><a href="#L-315"><span class="linenos">315</span></a>
|
||||
</span><span id="L-316"><a href="#L-316"><span class="linenos">316</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">expression</span>
|
||||
</span><span id="L-317"><a href="#L-317"><span class="linenos">317</span></a>
|
||||
</span><span id="L-318"><a href="#L-318"><span class="linenos">318</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">from_or_join</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span>
|
||||
</span><span id="L-319"><a href="#L-319"><span class="linenos">319</span></a> <span class="c1"># Merge predicates from an outer join to the ON clause</span>
|
||||
</span><span id="L-320"><a href="#L-320"><span class="linenos">320</span></a> <span class="c1"># if it only has columns that are already joined</span>
|
||||
</span><span id="L-321"><a href="#L-321"><span class="linenos">321</span></a> <span class="n">from_</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"from"</span><span class="p">)</span>
|
||||
</span><span id="L-322"><a href="#L-322"><span class="linenos">322</span></a> <span class="n">sources</span> <span class="o">=</span> <span class="p">{</span><span class="n">table</span><span class="o">.</span><span class="n">alias_or_name</span> <span class="k">for</span> <span class="n">table</span> <span class="ow">in</span> <span class="n">from_</span><span class="o">.</span><span class="n">expressions</span><span class="p">}</span> <span class="k">if</span> <span class="n">from_</span> <span class="k">else</span> <span class="p">{}</span>
|
||||
</span><span id="L-323"><a href="#L-323"><span class="linenos">323</span></a>
|
||||
</span><span id="L-324"><a href="#L-324"><span class="linenos">324</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"joins"</span><span class="p">]:</span>
|
||||
</span><span id="L-325"><a href="#L-325"><span class="linenos">325</span></a> <span class="n">source</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="L-326"><a href="#L-326"><span class="linenos">326</span></a> <span class="n">sources</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">source</span><span class="p">)</span>
|
||||
</span><span id="L-327"><a href="#L-327"><span class="linenos">327</span></a> <span class="k">if</span> <span class="n">source</span> <span class="o">==</span> <span class="n">from_or_join</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span>
|
||||
</span><span id="L-328"><a href="#L-328"><span class="linenos">328</span></a> <span class="k">break</span>
|
||||
</span><span id="L-329"><a href="#L-329"><span class="linenos">329</span></a>
|
||||
</span><span id="L-330"><a href="#L-330"><span class="linenos">330</span></a> <span class="k">if</span> <span class="nb">set</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">where</span><span class="o">.</span><span class="n">this</span><span class="p">))</span> <span class="o"><=</span> <span class="n">sources</span><span class="p">:</span>
|
||||
</span><span id="L-331"><a href="#L-331"><span class="linenos">331</span></a> <span class="n">from_or_join</span><span class="o">.</span><span class="n">on</span><span class="p">(</span><span class="n">where</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
|
||||
</span><span id="L-332"><a href="#L-332"><span class="linenos">332</span></a> <span class="n">from_or_join</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"on"</span><span class="p">,</span> <span class="n">from_or_join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">))</span>
|
||||
</span><span id="L-333"><a href="#L-333"><span class="linenos">333</span></a> <span class="k">return</span>
|
||||
</span><span id="L-334"><a href="#L-334"><span class="linenos">334</span></a>
|
||||
</span><span id="L-335"><a href="#L-335"><span class="linenos">335</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">where</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
|
||||
</span><span id="L-336"><a href="#L-336"><span class="linenos">336</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"where"</span><span class="p">,</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"where"</span><span class="p">))</span>
|
||||
</span><span id="L-337"><a href="#L-337"><span class="linenos">337</span></a>
|
||||
</span><span id="L-338"><a href="#L-338"><span class="linenos">338</span></a>
|
||||
</span><span id="L-339"><a href="#L-339"><span class="linenos">339</span></a>
|
||||
</span><span id="L-340"><a href="#L-340"><span class="linenos">340</span></a><span class="k">def</span> <span class="nf">_merge_order</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">):</span>
|
||||
</span><span id="L-341"><a href="#L-341"><span class="linenos">341</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-342"><a href="#L-342"><span class="linenos">342</span></a><span class="sd"> Merge ORDER clause of inner query into outer query.</span>
|
||||
</span><span id="L-343"><a href="#L-343"><span class="linenos">343</span></a>
|
||||
</span><span id="L-344"><a href="#L-344"><span class="linenos">344</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-345"><a href="#L-345"><span class="linenos">345</span></a><span class="sd"> outer_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-346"><a href="#L-346"><span class="linenos">346</span></a><span class="sd"> inner_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-347"><a href="#L-347"><span class="linenos">347</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-348"><a href="#L-348"><span class="linenos">348</span></a> <span class="k">if</span> <span class="p">(</span>
|
||||
</span><span id="L-349"><a href="#L-349"><span class="linenos">349</span></a> <span class="nb">any</span><span class="p">(</span>
|
||||
</span><span id="L-350"><a href="#L-350"><span class="linenos">350</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">arg</span><span class="p">)</span> <span class="k">for</span> <span class="n">arg</span> <span class="ow">in</span> <span class="p">[</span><span class="s2">"group"</span><span class="p">,</span> <span class="s2">"distinct"</span><span class="p">,</span> <span class="s2">"having"</span><span class="p">,</span> <span class="s2">"order"</span><span class="p">]</span>
|
||||
</span><span id="L-351"><a href="#L-351"><span class="linenos">351</span></a> <span class="p">)</span>
|
||||
</span><span id="L-352"><a href="#L-352"><span class="linenos">352</span></a> <span class="ow">or</span> <span class="nb">len</span><span class="p">(</span><span class="n">outer_scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">1</span>
|
||||
</span><span id="L-353"><a href="#L-353"><span class="linenos">353</span></a> <span class="ow">or</span> <span class="nb">any</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">find</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">AggFunc</span><span class="p">)</span> <span class="k">for</span> <span class="n">expression</span> <span class="ow">in</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">expressions</span><span class="p">)</span>
|
||||
</span><span id="L-354"><a href="#L-354"><span class="linenos">354</span></a> <span class="p">):</span>
|
||||
</span><span id="L-355"><a href="#L-355"><span class="linenos">355</span></a> <span class="k">return</span>
|
||||
</span><span id="L-356"><a href="#L-356"><span class="linenos">356</span></a>
|
||||
</span><span id="L-357"><a href="#L-357"><span class="linenos">357</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"order"</span><span class="p">,</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"order"</span><span class="p">))</span>
|
||||
</span><span id="L-339"><a href="#L-339"><span class="linenos">339</span></a><span class="k">def</span> <span class="nf">_merge_order</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">):</span>
|
||||
</span><span id="L-340"><a href="#L-340"><span class="linenos">340</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-341"><a href="#L-341"><span class="linenos">341</span></a><span class="sd"> Merge ORDER clause of inner query into outer query.</span>
|
||||
</span><span id="L-342"><a href="#L-342"><span class="linenos">342</span></a>
|
||||
</span><span id="L-343"><a href="#L-343"><span class="linenos">343</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-344"><a href="#L-344"><span class="linenos">344</span></a><span class="sd"> outer_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-345"><a href="#L-345"><span class="linenos">345</span></a><span class="sd"> inner_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-346"><a href="#L-346"><span class="linenos">346</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-347"><a href="#L-347"><span class="linenos">347</span></a> <span class="k">if</span> <span class="p">(</span>
|
||||
</span><span id="L-348"><a href="#L-348"><span class="linenos">348</span></a> <span class="nb">any</span><span class="p">(</span>
|
||||
</span><span id="L-349"><a href="#L-349"><span class="linenos">349</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">arg</span><span class="p">)</span> <span class="k">for</span> <span class="n">arg</span> <span class="ow">in</span> <span class="p">[</span><span class="s2">"group"</span><span class="p">,</span> <span class="s2">"distinct"</span><span class="p">,</span> <span class="s2">"having"</span><span class="p">,</span> <span class="s2">"order"</span><span class="p">]</span>
|
||||
</span><span id="L-350"><a href="#L-350"><span class="linenos">350</span></a> <span class="p">)</span>
|
||||
</span><span id="L-351"><a href="#L-351"><span class="linenos">351</span></a> <span class="ow">or</span> <span class="nb">len</span><span class="p">(</span><span class="n">outer_scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">1</span>
|
||||
</span><span id="L-352"><a href="#L-352"><span class="linenos">352</span></a> <span class="ow">or</span> <span class="nb">any</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">find</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">AggFunc</span><span class="p">)</span> <span class="k">for</span> <span class="n">expression</span> <span class="ow">in</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">expressions</span><span class="p">)</span>
|
||||
</span><span id="L-353"><a href="#L-353"><span class="linenos">353</span></a> <span class="p">):</span>
|
||||
</span><span id="L-354"><a href="#L-354"><span class="linenos">354</span></a> <span class="k">return</span>
|
||||
</span><span id="L-355"><a href="#L-355"><span class="linenos">355</span></a>
|
||||
</span><span id="L-356"><a href="#L-356"><span class="linenos">356</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"order"</span><span class="p">,</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"order"</span><span class="p">))</span>
|
||||
</span><span id="L-357"><a href="#L-357"><span class="linenos">357</span></a>
|
||||
</span><span id="L-358"><a href="#L-358"><span class="linenos">358</span></a>
|
||||
</span><span id="L-359"><a href="#L-359"><span class="linenos">359</span></a>
|
||||
</span><span id="L-360"><a href="#L-360"><span class="linenos">360</span></a><span class="k">def</span> <span class="nf">_merge_hints</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">):</span>
|
||||
</span><span id="L-361"><a href="#L-361"><span class="linenos">361</span></a> <span class="n">inner_scope_hint</span> <span class="o">=</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"hint"</span><span class="p">)</span>
|
||||
</span><span id="L-362"><a href="#L-362"><span class="linenos">362</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">inner_scope_hint</span><span class="p">:</span>
|
||||
</span><span id="L-363"><a href="#L-363"><span class="linenos">363</span></a> <span class="k">return</span>
|
||||
</span><span id="L-364"><a href="#L-364"><span class="linenos">364</span></a> <span class="n">outer_scope_hint</span> <span class="o">=</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"hint"</span><span class="p">)</span>
|
||||
</span><span id="L-365"><a href="#L-365"><span class="linenos">365</span></a> <span class="k">if</span> <span class="n">outer_scope_hint</span><span class="p">:</span>
|
||||
</span><span id="L-366"><a href="#L-366"><span class="linenos">366</span></a> <span class="k">for</span> <span class="n">hint_expression</span> <span class="ow">in</span> <span class="n">inner_scope_hint</span><span class="o">.</span><span class="n">expressions</span><span class="p">:</span>
|
||||
</span><span id="L-367"><a href="#L-367"><span class="linenos">367</span></a> <span class="n">outer_scope_hint</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="s2">"expressions"</span><span class="p">,</span> <span class="n">hint_expression</span><span class="p">)</span>
|
||||
</span><span id="L-368"><a href="#L-368"><span class="linenos">368</span></a> <span class="k">else</span><span class="p">:</span>
|
||||
</span><span id="L-369"><a href="#L-369"><span class="linenos">369</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"hint"</span><span class="p">,</span> <span class="n">inner_scope_hint</span><span class="p">)</span>
|
||||
</span><span id="L-359"><a href="#L-359"><span class="linenos">359</span></a><span class="k">def</span> <span class="nf">_merge_hints</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">):</span>
|
||||
</span><span id="L-360"><a href="#L-360"><span class="linenos">360</span></a> <span class="n">inner_scope_hint</span> <span class="o">=</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"hint"</span><span class="p">)</span>
|
||||
</span><span id="L-361"><a href="#L-361"><span class="linenos">361</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">inner_scope_hint</span><span class="p">:</span>
|
||||
</span><span id="L-362"><a href="#L-362"><span class="linenos">362</span></a> <span class="k">return</span>
|
||||
</span><span id="L-363"><a href="#L-363"><span class="linenos">363</span></a> <span class="n">outer_scope_hint</span> <span class="o">=</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"hint"</span><span class="p">)</span>
|
||||
</span><span id="L-364"><a href="#L-364"><span class="linenos">364</span></a> <span class="k">if</span> <span class="n">outer_scope_hint</span><span class="p">:</span>
|
||||
</span><span id="L-365"><a href="#L-365"><span class="linenos">365</span></a> <span class="k">for</span> <span class="n">hint_expression</span> <span class="ow">in</span> <span class="n">inner_scope_hint</span><span class="o">.</span><span class="n">expressions</span><span class="p">:</span>
|
||||
</span><span id="L-366"><a href="#L-366"><span class="linenos">366</span></a> <span class="n">outer_scope_hint</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="s2">"expressions"</span><span class="p">,</span> <span class="n">hint_expression</span><span class="p">)</span>
|
||||
</span><span id="L-367"><a href="#L-367"><span class="linenos">367</span></a> <span class="k">else</span><span class="p">:</span>
|
||||
</span><span id="L-368"><a href="#L-368"><span class="linenos">368</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"hint"</span><span class="p">,</span> <span class="n">inner_scope_hint</span><span class="p">)</span>
|
||||
</span><span id="L-369"><a href="#L-369"><span class="linenos">369</span></a>
|
||||
</span><span id="L-370"><a href="#L-370"><span class="linenos">370</span></a>
|
||||
</span><span id="L-371"><a href="#L-371"><span class="linenos">371</span></a>
|
||||
</span><span id="L-372"><a href="#L-372"><span class="linenos">372</span></a><span class="k">def</span> <span class="nf">_pop_cte</span><span class="p">(</span><span class="n">inner_scope</span><span class="p">):</span>
|
||||
</span><span id="L-373"><a href="#L-373"><span class="linenos">373</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-374"><a href="#L-374"><span class="linenos">374</span></a><span class="sd"> Remove CTE from the AST.</span>
|
||||
</span><span id="L-375"><a href="#L-375"><span class="linenos">375</span></a>
|
||||
</span><span id="L-376"><a href="#L-376"><span class="linenos">376</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-377"><a href="#L-377"><span class="linenos">377</span></a><span class="sd"> inner_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-378"><a href="#L-378"><span class="linenos">378</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-379"><a href="#L-379"><span class="linenos">379</span></a> <span class="n">cte</span> <span class="o">=</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">parent</span>
|
||||
</span><span id="L-380"><a href="#L-380"><span class="linenos">380</span></a> <span class="n">with_</span> <span class="o">=</span> <span class="n">cte</span><span class="o">.</span><span class="n">parent</span>
|
||||
</span><span id="L-381"><a href="#L-381"><span class="linenos">381</span></a> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">with_</span><span class="o">.</span><span class="n">expressions</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
|
||||
</span><span id="L-382"><a href="#L-382"><span class="linenos">382</span></a> <span class="n">with_</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span>
|
||||
</span><span id="L-383"><a href="#L-383"><span class="linenos">383</span></a> <span class="k">else</span><span class="p">:</span>
|
||||
</span><span id="L-384"><a href="#L-384"><span class="linenos">384</span></a> <span class="n">cte</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span>
|
||||
</span><span id="L-371"><a href="#L-371"><span class="linenos">371</span></a><span class="k">def</span> <span class="nf">_pop_cte</span><span class="p">(</span><span class="n">inner_scope</span><span class="p">):</span>
|
||||
</span><span id="L-372"><a href="#L-372"><span class="linenos">372</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-373"><a href="#L-373"><span class="linenos">373</span></a><span class="sd"> Remove CTE from the AST.</span>
|
||||
</span><span id="L-374"><a href="#L-374"><span class="linenos">374</span></a>
|
||||
</span><span id="L-375"><a href="#L-375"><span class="linenos">375</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-376"><a href="#L-376"><span class="linenos">376</span></a><span class="sd"> inner_scope (sqlglot.optimizer.scope.Scope)</span>
|
||||
</span><span id="L-377"><a href="#L-377"><span class="linenos">377</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-378"><a href="#L-378"><span class="linenos">378</span></a> <span class="n">cte</span> <span class="o">=</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">parent</span>
|
||||
</span><span id="L-379"><a href="#L-379"><span class="linenos">379</span></a> <span class="n">with_</span> <span class="o">=</span> <span class="n">cte</span><span class="o">.</span><span class="n">parent</span>
|
||||
</span><span id="L-380"><a href="#L-380"><span class="linenos">380</span></a> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">with_</span><span class="o">.</span><span class="n">expressions</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
|
||||
</span><span id="L-381"><a href="#L-381"><span class="linenos">381</span></a> <span class="n">with_</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span>
|
||||
</span><span id="L-382"><a href="#L-382"><span class="linenos">382</span></a> <span class="k">else</span><span class="p">:</span>
|
||||
</span><span id="L-383"><a href="#L-383"><span class="linenos">383</span></a> <span class="n">cte</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span>
|
||||
</span></pre></div>
|
||||
|
||||
|
||||
|
|
@ -461,35 +460,35 @@
|
|||
|
||||
</div>
|
||||
<a class="headerlink" href="#merge_subqueries"></a>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="merge_subqueries-10"><a href="#merge_subqueries-10"><span class="linenos">10</span></a><span class="k">def</span> <span class="nf">merge_subqueries</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
|
||||
</span><span id="merge_subqueries-11"><a href="#merge_subqueries-11"><span class="linenos">11</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="merge_subqueries-12"><a href="#merge_subqueries-12"><span class="linenos">12</span></a><span class="sd"> Rewrite sqlglot AST to merge derived tables into the outer query.</span>
|
||||
</span><span id="merge_subqueries-13"><a href="#merge_subqueries-13"><span class="linenos">13</span></a>
|
||||
</span><span id="merge_subqueries-14"><a href="#merge_subqueries-14"><span class="linenos">14</span></a><span class="sd"> This also merges CTEs if they are selected from only once.</span>
|
||||
</span><span id="merge_subqueries-15"><a href="#merge_subqueries-15"><span class="linenos">15</span></a>
|
||||
</span><span id="merge_subqueries-16"><a href="#merge_subqueries-16"><span class="linenos">16</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="merge_subqueries-17"><a href="#merge_subqueries-17"><span class="linenos">17</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="merge_subqueries-18"><a href="#merge_subqueries-18"><span class="linenos">18</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT a FROM (SELECT x.a FROM x) JOIN y")</span>
|
||||
</span><span id="merge_subqueries-19"><a href="#merge_subqueries-19"><span class="linenos">19</span></a><span class="sd"> >>> merge_subqueries(expression).sql()</span>
|
||||
</span><span id="merge_subqueries-20"><a href="#merge_subqueries-20"><span class="linenos">20</span></a><span class="sd"> 'SELECT x.a FROM x JOIN y'</span>
|
||||
</span><span id="merge_subqueries-21"><a href="#merge_subqueries-21"><span class="linenos">21</span></a>
|
||||
</span><span id="merge_subqueries-22"><a href="#merge_subqueries-22"><span class="linenos">22</span></a><span class="sd"> If `leave_tables_isolated` is True, this will not merge inner queries into outer</span>
|
||||
</span><span id="merge_subqueries-23"><a href="#merge_subqueries-23"><span class="linenos">23</span></a><span class="sd"> queries if it would result in multiple table selects in a single query:</span>
|
||||
</span><span id="merge_subqueries-24"><a href="#merge_subqueries-24"><span class="linenos">24</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT a FROM (SELECT x.a FROM x) JOIN y")</span>
|
||||
</span><span id="merge_subqueries-25"><a href="#merge_subqueries-25"><span class="linenos">25</span></a><span class="sd"> >>> merge_subqueries(expression, leave_tables_isolated=True).sql()</span>
|
||||
</span><span id="merge_subqueries-26"><a href="#merge_subqueries-26"><span class="linenos">26</span></a><span class="sd"> 'SELECT a FROM (SELECT x.a FROM x) JOIN y'</span>
|
||||
</span><span id="merge_subqueries-27"><a href="#merge_subqueries-27"><span class="linenos">27</span></a>
|
||||
</span><span id="merge_subqueries-28"><a href="#merge_subqueries-28"><span class="linenos">28</span></a><span class="sd"> Inspired by https://dev.mysql.com/doc/refman/8.0/en/derived-table-optimization.html</span>
|
||||
</span><span id="merge_subqueries-29"><a href="#merge_subqueries-29"><span class="linenos">29</span></a>
|
||||
</span><span id="merge_subqueries-30"><a href="#merge_subqueries-30"><span class="linenos">30</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="merge_subqueries-31"><a href="#merge_subqueries-31"><span class="linenos">31</span></a><span class="sd"> expression (sqlglot.Expression): expression to optimize</span>
|
||||
</span><span id="merge_subqueries-32"><a href="#merge_subqueries-32"><span class="linenos">32</span></a><span class="sd"> leave_tables_isolated (bool):</span>
|
||||
</span><span id="merge_subqueries-33"><a href="#merge_subqueries-33"><span class="linenos">33</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="merge_subqueries-34"><a href="#merge_subqueries-34"><span class="linenos">34</span></a><span class="sd"> sqlglot.Expression: optimized expression</span>
|
||||
</span><span id="merge_subqueries-35"><a href="#merge_subqueries-35"><span class="linenos">35</span></a><span class="sd"> """</span>
|
||||
</span><span id="merge_subqueries-36"><a href="#merge_subqueries-36"><span class="linenos">36</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">merge_ctes</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="p">)</span>
|
||||
</span><span id="merge_subqueries-37"><a href="#merge_subqueries-37"><span class="linenos">37</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">merge_derived_tables</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="p">)</span>
|
||||
</span><span id="merge_subqueries-38"><a href="#merge_subqueries-38"><span class="linenos">38</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="merge_subqueries-9"><a href="#merge_subqueries-9"><span class="linenos"> 9</span></a><span class="k">def</span> <span class="nf">merge_subqueries</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
|
||||
</span><span id="merge_subqueries-10"><a href="#merge_subqueries-10"><span class="linenos">10</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="merge_subqueries-11"><a href="#merge_subqueries-11"><span class="linenos">11</span></a><span class="sd"> Rewrite sqlglot AST to merge derived tables into the outer query.</span>
|
||||
</span><span id="merge_subqueries-12"><a href="#merge_subqueries-12"><span class="linenos">12</span></a>
|
||||
</span><span id="merge_subqueries-13"><a href="#merge_subqueries-13"><span class="linenos">13</span></a><span class="sd"> This also merges CTEs if they are selected from only once.</span>
|
||||
</span><span id="merge_subqueries-14"><a href="#merge_subqueries-14"><span class="linenos">14</span></a>
|
||||
</span><span id="merge_subqueries-15"><a href="#merge_subqueries-15"><span class="linenos">15</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="merge_subqueries-16"><a href="#merge_subqueries-16"><span class="linenos">16</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="merge_subqueries-17"><a href="#merge_subqueries-17"><span class="linenos">17</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT a FROM (SELECT x.a FROM x) JOIN y")</span>
|
||||
</span><span id="merge_subqueries-18"><a href="#merge_subqueries-18"><span class="linenos">18</span></a><span class="sd"> >>> merge_subqueries(expression).sql()</span>
|
||||
</span><span id="merge_subqueries-19"><a href="#merge_subqueries-19"><span class="linenos">19</span></a><span class="sd"> 'SELECT x.a FROM x JOIN y'</span>
|
||||
</span><span id="merge_subqueries-20"><a href="#merge_subqueries-20"><span class="linenos">20</span></a>
|
||||
</span><span id="merge_subqueries-21"><a href="#merge_subqueries-21"><span class="linenos">21</span></a><span class="sd"> If `leave_tables_isolated` is True, this will not merge inner queries into outer</span>
|
||||
</span><span id="merge_subqueries-22"><a href="#merge_subqueries-22"><span class="linenos">22</span></a><span class="sd"> queries if it would result in multiple table selects in a single query:</span>
|
||||
</span><span id="merge_subqueries-23"><a href="#merge_subqueries-23"><span class="linenos">23</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT a FROM (SELECT x.a FROM x) JOIN y")</span>
|
||||
</span><span id="merge_subqueries-24"><a href="#merge_subqueries-24"><span class="linenos">24</span></a><span class="sd"> >>> merge_subqueries(expression, leave_tables_isolated=True).sql()</span>
|
||||
</span><span id="merge_subqueries-25"><a href="#merge_subqueries-25"><span class="linenos">25</span></a><span class="sd"> 'SELECT a FROM (SELECT x.a FROM x) JOIN y'</span>
|
||||
</span><span id="merge_subqueries-26"><a href="#merge_subqueries-26"><span class="linenos">26</span></a>
|
||||
</span><span id="merge_subqueries-27"><a href="#merge_subqueries-27"><span class="linenos">27</span></a><span class="sd"> Inspired by https://dev.mysql.com/doc/refman/8.0/en/derived-table-optimization.html</span>
|
||||
</span><span id="merge_subqueries-28"><a href="#merge_subqueries-28"><span class="linenos">28</span></a>
|
||||
</span><span id="merge_subqueries-29"><a href="#merge_subqueries-29"><span class="linenos">29</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="merge_subqueries-30"><a href="#merge_subqueries-30"><span class="linenos">30</span></a><span class="sd"> expression (sqlglot.Expression): expression to optimize</span>
|
||||
</span><span id="merge_subqueries-31"><a href="#merge_subqueries-31"><span class="linenos">31</span></a><span class="sd"> leave_tables_isolated (bool):</span>
|
||||
</span><span id="merge_subqueries-32"><a href="#merge_subqueries-32"><span class="linenos">32</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="merge_subqueries-33"><a href="#merge_subqueries-33"><span class="linenos">33</span></a><span class="sd"> sqlglot.Expression: optimized expression</span>
|
||||
</span><span id="merge_subqueries-34"><a href="#merge_subqueries-34"><span class="linenos">34</span></a><span class="sd"> """</span>
|
||||
</span><span id="merge_subqueries-35"><a href="#merge_subqueries-35"><span class="linenos">35</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">merge_ctes</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="p">)</span>
|
||||
</span><span id="merge_subqueries-36"><a href="#merge_subqueries-36"><span class="linenos">36</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">merge_derived_tables</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="p">)</span>
|
||||
</span><span id="merge_subqueries-37"><a href="#merge_subqueries-37"><span class="linenos">37</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span></pre></div>
|
||||
|
||||
|
||||
|
|
@ -551,38 +550,38 @@ queries if it would result in multiple table selects in a single query:</p>
|
|||
|
||||
</div>
|
||||
<a class="headerlink" href="#merge_ctes"></a>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="merge_ctes-52"><a href="#merge_ctes-52"><span class="linenos">52</span></a><span class="k">def</span> <span class="nf">merge_ctes</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
|
||||
</span><span id="merge_ctes-53"><a href="#merge_ctes-53"><span class="linenos">53</span></a> <span class="n">scopes</span> <span class="o">=</span> <span class="n">traverse_scope</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="merge_ctes-54"><a href="#merge_ctes-54"><span class="linenos">54</span></a>
|
||||
</span><span id="merge_ctes-55"><a href="#merge_ctes-55"><span class="linenos">55</span></a> <span class="c1"># All places where we select from CTEs.</span>
|
||||
</span><span id="merge_ctes-56"><a href="#merge_ctes-56"><span class="linenos">56</span></a> <span class="c1"># We key on the CTE scope so we can detect CTES that are selected from multiple times.</span>
|
||||
</span><span id="merge_ctes-57"><a href="#merge_ctes-57"><span class="linenos">57</span></a> <span class="n">cte_selections</span> <span class="o">=</span> <span class="n">defaultdict</span><span class="p">(</span><span class="nb">list</span><span class="p">)</span>
|
||||
</span><span id="merge_ctes-58"><a href="#merge_ctes-58"><span class="linenos">58</span></a> <span class="k">for</span> <span class="n">outer_scope</span> <span class="ow">in</span> <span class="n">scopes</span><span class="p">:</span>
|
||||
</span><span id="merge_ctes-59"><a href="#merge_ctes-59"><span class="linenos">59</span></a> <span class="k">for</span> <span class="n">table</span><span class="p">,</span> <span class="n">inner_scope</span> <span class="ow">in</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="o">.</span><span class="n">values</span><span class="p">():</span>
|
||||
</span><span id="merge_ctes-60"><a href="#merge_ctes-60"><span class="linenos">60</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">inner_scope</span><span class="p">,</span> <span class="n">Scope</span><span class="p">)</span> <span class="ow">and</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">is_cte</span><span class="p">:</span>
|
||||
</span><span id="merge_ctes-61"><a href="#merge_ctes-61"><span class="linenos">61</span></a> <span class="n">cte_selections</span><span class="p">[</span><span class="nb">id</span><span class="p">(</span><span class="n">inner_scope</span><span class="p">)]</span><span class="o">.</span><span class="n">append</span><span class="p">(</span>
|
||||
</span><span id="merge_ctes-62"><a href="#merge_ctes-62"><span class="linenos">62</span></a> <span class="p">(</span>
|
||||
</span><span id="merge_ctes-63"><a href="#merge_ctes-63"><span class="linenos">63</span></a> <span class="n">outer_scope</span><span class="p">,</span>
|
||||
</span><span id="merge_ctes-64"><a href="#merge_ctes-64"><span class="linenos">64</span></a> <span class="n">inner_scope</span><span class="p">,</span>
|
||||
</span><span id="merge_ctes-65"><a href="#merge_ctes-65"><span class="linenos">65</span></a> <span class="n">table</span><span class="p">,</span>
|
||||
</span><span id="merge_ctes-66"><a href="#merge_ctes-66"><span class="linenos">66</span></a> <span class="p">)</span>
|
||||
</span><span id="merge_ctes-67"><a href="#merge_ctes-67"><span class="linenos">67</span></a> <span class="p">)</span>
|
||||
</span><span id="merge_ctes-68"><a href="#merge_ctes-68"><span class="linenos">68</span></a>
|
||||
</span><span id="merge_ctes-69"><a href="#merge_ctes-69"><span class="linenos">69</span></a> <span class="n">singular_cte_selections</span> <span class="o">=</span> <span class="p">[</span><span class="n">v</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">cte_selections</span><span class="o">.</span><span class="n">items</span><span class="p">()</span> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="p">]</span>
|
||||
</span><span id="merge_ctes-70"><a href="#merge_ctes-70"><span class="linenos">70</span></a> <span class="k">for</span> <span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">table</span> <span class="ow">in</span> <span class="n">singular_cte_selections</span><span class="p">:</span>
|
||||
</span><span id="merge_ctes-71"><a href="#merge_ctes-71"><span class="linenos">71</span></a> <span class="n">from_or_join</span> <span class="o">=</span> <span class="n">table</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">)</span>
|
||||
</span><span id="merge_ctes-72"><a href="#merge_ctes-72"><span class="linenos">72</span></a> <span class="k">if</span> <span class="n">_mergeable</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">):</span>
|
||||
</span><span id="merge_ctes-73"><a href="#merge_ctes-73"><span class="linenos">73</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">table</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="merge_ctes-74"><a href="#merge_ctes-74"><span class="linenos">74</span></a> <span class="n">_rename_inner_sources</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="merge_ctes-75"><a href="#merge_ctes-75"><span class="linenos">75</span></a> <span class="n">_merge_from</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">table</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="merge_ctes-76"><a href="#merge_ctes-76"><span class="linenos">76</span></a> <span class="n">_merge_expressions</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="merge_ctes-77"><a href="#merge_ctes-77"><span class="linenos">77</span></a> <span class="n">_merge_joins</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">)</span>
|
||||
</span><span id="merge_ctes-78"><a href="#merge_ctes-78"><span class="linenos">78</span></a> <span class="n">_merge_where</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">)</span>
|
||||
</span><span id="merge_ctes-79"><a href="#merge_ctes-79"><span class="linenos">79</span></a> <span class="n">_merge_order</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">)</span>
|
||||
</span><span id="merge_ctes-80"><a href="#merge_ctes-80"><span class="linenos">80</span></a> <span class="n">_merge_hints</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">)</span>
|
||||
</span><span id="merge_ctes-81"><a href="#merge_ctes-81"><span class="linenos">81</span></a> <span class="n">_pop_cte</span><span class="p">(</span><span class="n">inner_scope</span><span class="p">)</span>
|
||||
</span><span id="merge_ctes-82"><a href="#merge_ctes-82"><span class="linenos">82</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">clear_cache</span><span class="p">()</span>
|
||||
</span><span id="merge_ctes-83"><a href="#merge_ctes-83"><span class="linenos">83</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="merge_ctes-51"><a href="#merge_ctes-51"><span class="linenos">51</span></a><span class="k">def</span> <span class="nf">merge_ctes</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
|
||||
</span><span id="merge_ctes-52"><a href="#merge_ctes-52"><span class="linenos">52</span></a> <span class="n">scopes</span> <span class="o">=</span> <span class="n">traverse_scope</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="merge_ctes-53"><a href="#merge_ctes-53"><span class="linenos">53</span></a>
|
||||
</span><span id="merge_ctes-54"><a href="#merge_ctes-54"><span class="linenos">54</span></a> <span class="c1"># All places where we select from CTEs.</span>
|
||||
</span><span id="merge_ctes-55"><a href="#merge_ctes-55"><span class="linenos">55</span></a> <span class="c1"># We key on the CTE scope so we can detect CTES that are selected from multiple times.</span>
|
||||
</span><span id="merge_ctes-56"><a href="#merge_ctes-56"><span class="linenos">56</span></a> <span class="n">cte_selections</span> <span class="o">=</span> <span class="n">defaultdict</span><span class="p">(</span><span class="nb">list</span><span class="p">)</span>
|
||||
</span><span id="merge_ctes-57"><a href="#merge_ctes-57"><span class="linenos">57</span></a> <span class="k">for</span> <span class="n">outer_scope</span> <span class="ow">in</span> <span class="n">scopes</span><span class="p">:</span>
|
||||
</span><span id="merge_ctes-58"><a href="#merge_ctes-58"><span class="linenos">58</span></a> <span class="k">for</span> <span class="n">table</span><span class="p">,</span> <span class="n">inner_scope</span> <span class="ow">in</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="o">.</span><span class="n">values</span><span class="p">():</span>
|
||||
</span><span id="merge_ctes-59"><a href="#merge_ctes-59"><span class="linenos">59</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">inner_scope</span><span class="p">,</span> <span class="n">Scope</span><span class="p">)</span> <span class="ow">and</span> <span class="n">inner_scope</span><span class="o">.</span><span class="n">is_cte</span><span class="p">:</span>
|
||||
</span><span id="merge_ctes-60"><a href="#merge_ctes-60"><span class="linenos">60</span></a> <span class="n">cte_selections</span><span class="p">[</span><span class="nb">id</span><span class="p">(</span><span class="n">inner_scope</span><span class="p">)]</span><span class="o">.</span><span class="n">append</span><span class="p">(</span>
|
||||
</span><span id="merge_ctes-61"><a href="#merge_ctes-61"><span class="linenos">61</span></a> <span class="p">(</span>
|
||||
</span><span id="merge_ctes-62"><a href="#merge_ctes-62"><span class="linenos">62</span></a> <span class="n">outer_scope</span><span class="p">,</span>
|
||||
</span><span id="merge_ctes-63"><a href="#merge_ctes-63"><span class="linenos">63</span></a> <span class="n">inner_scope</span><span class="p">,</span>
|
||||
</span><span id="merge_ctes-64"><a href="#merge_ctes-64"><span class="linenos">64</span></a> <span class="n">table</span><span class="p">,</span>
|
||||
</span><span id="merge_ctes-65"><a href="#merge_ctes-65"><span class="linenos">65</span></a> <span class="p">)</span>
|
||||
</span><span id="merge_ctes-66"><a href="#merge_ctes-66"><span class="linenos">66</span></a> <span class="p">)</span>
|
||||
</span><span id="merge_ctes-67"><a href="#merge_ctes-67"><span class="linenos">67</span></a>
|
||||
</span><span id="merge_ctes-68"><a href="#merge_ctes-68"><span class="linenos">68</span></a> <span class="n">singular_cte_selections</span> <span class="o">=</span> <span class="p">[</span><span class="n">v</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">cte_selections</span><span class="o">.</span><span class="n">items</span><span class="p">()</span> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="p">]</span>
|
||||
</span><span id="merge_ctes-69"><a href="#merge_ctes-69"><span class="linenos">69</span></a> <span class="k">for</span> <span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">table</span> <span class="ow">in</span> <span class="n">singular_cte_selections</span><span class="p">:</span>
|
||||
</span><span id="merge_ctes-70"><a href="#merge_ctes-70"><span class="linenos">70</span></a> <span class="n">from_or_join</span> <span class="o">=</span> <span class="n">table</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">)</span>
|
||||
</span><span id="merge_ctes-71"><a href="#merge_ctes-71"><span class="linenos">71</span></a> <span class="k">if</span> <span class="n">_mergeable</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">):</span>
|
||||
</span><span id="merge_ctes-72"><a href="#merge_ctes-72"><span class="linenos">72</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">table</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="merge_ctes-73"><a href="#merge_ctes-73"><span class="linenos">73</span></a> <span class="n">_rename_inner_sources</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="merge_ctes-74"><a href="#merge_ctes-74"><span class="linenos">74</span></a> <span class="n">_merge_from</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">table</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="merge_ctes-75"><a href="#merge_ctes-75"><span class="linenos">75</span></a> <span class="n">_merge_expressions</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="merge_ctes-76"><a href="#merge_ctes-76"><span class="linenos">76</span></a> <span class="n">_merge_joins</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">)</span>
|
||||
</span><span id="merge_ctes-77"><a href="#merge_ctes-77"><span class="linenos">77</span></a> <span class="n">_merge_where</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">)</span>
|
||||
</span><span id="merge_ctes-78"><a href="#merge_ctes-78"><span class="linenos">78</span></a> <span class="n">_merge_order</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">)</span>
|
||||
</span><span id="merge_ctes-79"><a href="#merge_ctes-79"><span class="linenos">79</span></a> <span class="n">_merge_hints</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">)</span>
|
||||
</span><span id="merge_ctes-80"><a href="#merge_ctes-80"><span class="linenos">80</span></a> <span class="n">_pop_cte</span><span class="p">(</span><span class="n">inner_scope</span><span class="p">)</span>
|
||||
</span><span id="merge_ctes-81"><a href="#merge_ctes-81"><span class="linenos">81</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">clear_cache</span><span class="p">()</span>
|
||||
</span><span id="merge_ctes-82"><a href="#merge_ctes-82"><span class="linenos">82</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span></pre></div>
|
||||
|
||||
|
||||
|
|
@ -600,22 +599,22 @@ queries if it would result in multiple table selects in a single query:</p>
|
|||
|
||||
</div>
|
||||
<a class="headerlink" href="#merge_derived_tables"></a>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="merge_derived_tables-86"><a href="#merge_derived_tables-86"><span class="linenos"> 86</span></a><span class="k">def</span> <span class="nf">merge_derived_tables</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
|
||||
</span><span id="merge_derived_tables-87"><a href="#merge_derived_tables-87"><span class="linenos"> 87</span></a> <span class="k">for</span> <span class="n">outer_scope</span> <span class="ow">in</span> <span class="n">traverse_scope</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="merge_derived_tables-88"><a href="#merge_derived_tables-88"><span class="linenos"> 88</span></a> <span class="k">for</span> <span class="n">subquery</span> <span class="ow">in</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">derived_tables</span><span class="p">:</span>
|
||||
</span><span id="merge_derived_tables-89"><a href="#merge_derived_tables-89"><span class="linenos"> 89</span></a> <span class="n">from_or_join</span> <span class="o">=</span> <span class="n">subquery</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">)</span>
|
||||
</span><span id="merge_derived_tables-90"><a href="#merge_derived_tables-90"><span class="linenos"> 90</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">subquery</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="merge_derived_tables-91"><a href="#merge_derived_tables-91"><span class="linenos"> 91</span></a> <span class="n">inner_scope</span> <span class="o">=</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">sources</span><span class="p">[</span><span class="n">alias</span><span class="p">]</span>
|
||||
</span><span id="merge_derived_tables-92"><a href="#merge_derived_tables-92"><span class="linenos"> 92</span></a> <span class="k">if</span> <span class="n">_mergeable</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">):</span>
|
||||
</span><span id="merge_derived_tables-93"><a href="#merge_derived_tables-93"><span class="linenos"> 93</span></a> <span class="n">_rename_inner_sources</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="merge_derived_tables-94"><a href="#merge_derived_tables-94"><span class="linenos"> 94</span></a> <span class="n">_merge_from</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">subquery</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="merge_derived_tables-95"><a href="#merge_derived_tables-95"><span class="linenos"> 95</span></a> <span class="n">_merge_expressions</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="merge_derived_tables-96"><a href="#merge_derived_tables-96"><span class="linenos"> 96</span></a> <span class="n">_merge_joins</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">)</span>
|
||||
</span><span id="merge_derived_tables-97"><a href="#merge_derived_tables-97"><span class="linenos"> 97</span></a> <span class="n">_merge_where</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">)</span>
|
||||
</span><span id="merge_derived_tables-98"><a href="#merge_derived_tables-98"><span class="linenos"> 98</span></a> <span class="n">_merge_order</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">)</span>
|
||||
</span><span id="merge_derived_tables-99"><a href="#merge_derived_tables-99"><span class="linenos"> 99</span></a> <span class="n">_merge_hints</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">)</span>
|
||||
</span><span id="merge_derived_tables-100"><a href="#merge_derived_tables-100"><span class="linenos">100</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">clear_cache</span><span class="p">()</span>
|
||||
</span><span id="merge_derived_tables-101"><a href="#merge_derived_tables-101"><span class="linenos">101</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="merge_derived_tables-85"><a href="#merge_derived_tables-85"><span class="linenos"> 85</span></a><span class="k">def</span> <span class="nf">merge_derived_tables</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
|
||||
</span><span id="merge_derived_tables-86"><a href="#merge_derived_tables-86"><span class="linenos"> 86</span></a> <span class="k">for</span> <span class="n">outer_scope</span> <span class="ow">in</span> <span class="n">traverse_scope</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="merge_derived_tables-87"><a href="#merge_derived_tables-87"><span class="linenos"> 87</span></a> <span class="k">for</span> <span class="n">subquery</span> <span class="ow">in</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">derived_tables</span><span class="p">:</span>
|
||||
</span><span id="merge_derived_tables-88"><a href="#merge_derived_tables-88"><span class="linenos"> 88</span></a> <span class="n">from_or_join</span> <span class="o">=</span> <span class="n">subquery</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">)</span>
|
||||
</span><span id="merge_derived_tables-89"><a href="#merge_derived_tables-89"><span class="linenos"> 89</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">subquery</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="merge_derived_tables-90"><a href="#merge_derived_tables-90"><span class="linenos"> 90</span></a> <span class="n">inner_scope</span> <span class="o">=</span> <span class="n">outer_scope</span><span class="o">.</span><span class="n">sources</span><span class="p">[</span><span class="n">alias</span><span class="p">]</span>
|
||||
</span><span id="merge_derived_tables-91"><a href="#merge_derived_tables-91"><span class="linenos"> 91</span></a> <span class="k">if</span> <span class="n">_mergeable</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">leave_tables_isolated</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">):</span>
|
||||
</span><span id="merge_derived_tables-92"><a href="#merge_derived_tables-92"><span class="linenos"> 92</span></a> <span class="n">_rename_inner_sources</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="merge_derived_tables-93"><a href="#merge_derived_tables-93"><span class="linenos"> 93</span></a> <span class="n">_merge_from</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">subquery</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="merge_derived_tables-94"><a href="#merge_derived_tables-94"><span class="linenos"> 94</span></a> <span class="n">_merge_expressions</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">alias</span><span class="p">)</span>
|
||||
</span><span id="merge_derived_tables-95"><a href="#merge_derived_tables-95"><span class="linenos"> 95</span></a> <span class="n">_merge_joins</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">)</span>
|
||||
</span><span id="merge_derived_tables-96"><a href="#merge_derived_tables-96"><span class="linenos"> 96</span></a> <span class="n">_merge_where</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">,</span> <span class="n">from_or_join</span><span class="p">)</span>
|
||||
</span><span id="merge_derived_tables-97"><a href="#merge_derived_tables-97"><span class="linenos"> 97</span></a> <span class="n">_merge_order</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">)</span>
|
||||
</span><span id="merge_derived_tables-98"><a href="#merge_derived_tables-98"><span class="linenos"> 98</span></a> <span class="n">_merge_hints</span><span class="p">(</span><span class="n">outer_scope</span><span class="p">,</span> <span class="n">inner_scope</span><span class="p">)</span>
|
||||
</span><span id="merge_derived_tables-99"><a href="#merge_derived_tables-99"><span class="linenos"> 99</span></a> <span class="n">outer_scope</span><span class="o">.</span><span class="n">clear_cache</span><span class="p">()</span>
|
||||
</span><span id="merge_derived_tables-100"><a href="#merge_derived_tables-100"><span class="linenos">100</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span></pre></div>
|
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@ -28,8 +28,8 @@
|
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||||
<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
||||
<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
||||
<li>
|
||||
<a class="function" href="#normalize">normalize</a>
|
||||
</li>
|
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|
|
@ -65,133 +65,167 @@
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|
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<label class="view-source-button" for="mod-normalize-view-source"><span>View Source</span></label>
|
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|
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<div class="pdoc-code codehilite"><pre><span></span><span id="L-1"><a href="#L-1"><span class="linenos"> 1</span></a><span class="kn">from</span> <span class="nn">sqlglot</span> <span class="kn">import</span> <span class="n">exp</span>
|
||||
</span><span id="L-2"><a href="#L-2"><span class="linenos"> 2</span></a><span class="kn">from</span> <span class="nn">sqlglot.helper</span> <span class="kn">import</span> <span class="n">while_changing</span>
|
||||
</span><span id="L-3"><a href="#L-3"><span class="linenos"> 3</span></a><span class="kn">from</span> <span class="nn">sqlglot.optimizer.simplify</span> <span class="kn">import</span> <span class="n">flatten</span><span class="p">,</span> <span class="n">simplify</span><span class="p">,</span> <span class="n">uniq_sort</span>
|
||||
</span><span id="L-4"><a href="#L-4"><span class="linenos"> 4</span></a>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="L-1"><a href="#L-1"><span class="linenos"> 1</span></a><span class="kn">from</span> <span class="nn">__future__</span> <span class="kn">import</span> <span class="n">annotations</span>
|
||||
</span><span id="L-2"><a href="#L-2"><span class="linenos"> 2</span></a>
|
||||
</span><span id="L-3"><a href="#L-3"><span class="linenos"> 3</span></a><span class="kn">import</span> <span class="nn">logging</span>
|
||||
</span><span id="L-4"><a href="#L-4"><span class="linenos"> 4</span></a><span class="kn">import</span> <span class="nn">typing</span> <span class="k">as</span> <span class="nn">t</span>
|
||||
</span><span id="L-5"><a href="#L-5"><span class="linenos"> 5</span></a>
|
||||
</span><span id="L-6"><a href="#L-6"><span class="linenos"> 6</span></a><span class="k">def</span> <span class="nf">normalize</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">max_distance</span><span class="o">=</span><span class="mi">128</span><span class="p">):</span>
|
||||
</span><span id="L-7"><a href="#L-7"><span class="linenos"> 7</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-8"><a href="#L-8"><span class="linenos"> 8</span></a><span class="sd"> Rewrite sqlglot AST into conjunctive normal form.</span>
|
||||
</span><span id="L-9"><a href="#L-9"><span class="linenos"> 9</span></a>
|
||||
</span><span id="L-10"><a href="#L-10"><span class="linenos"> 10</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="L-11"><a href="#L-11"><span class="linenos"> 11</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="L-12"><a href="#L-12"><span class="linenos"> 12</span></a><span class="sd"> >>> expression = sqlglot.parse_one("(x AND y) OR z")</span>
|
||||
</span><span id="L-13"><a href="#L-13"><span class="linenos"> 13</span></a><span class="sd"> >>> normalize(expression).sql()</span>
|
||||
</span><span id="L-14"><a href="#L-14"><span class="linenos"> 14</span></a><span class="sd"> '(x OR z) AND (y OR z)'</span>
|
||||
</span><span id="L-15"><a href="#L-15"><span class="linenos"> 15</span></a>
|
||||
</span><span id="L-16"><a href="#L-16"><span class="linenos"> 16</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-17"><a href="#L-17"><span class="linenos"> 17</span></a><span class="sd"> expression (sqlglot.Expression): expression to normalize</span>
|
||||
</span><span id="L-18"><a href="#L-18"><span class="linenos"> 18</span></a><span class="sd"> dnf (bool): rewrite in disjunctive normal form instead</span>
|
||||
</span><span id="L-19"><a href="#L-19"><span class="linenos"> 19</span></a><span class="sd"> max_distance (int): the maximal estimated distance from cnf to attempt conversion</span>
|
||||
</span><span id="L-20"><a href="#L-20"><span class="linenos"> 20</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="L-21"><a href="#L-21"><span class="linenos"> 21</span></a><span class="sd"> sqlglot.Expression: normalized expression</span>
|
||||
</span><span id="L-22"><a href="#L-22"><span class="linenos"> 22</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-23"><a href="#L-23"><span class="linenos"> 23</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">simplify</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="L-24"><a href="#L-24"><span class="linenos"> 24</span></a>
|
||||
</span><span id="L-25"><a href="#L-25"><span class="linenos"> 25</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">while_changing</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="k">lambda</span> <span class="n">e</span><span class="p">:</span> <span class="n">distributive_law</span><span class="p">(</span><span class="n">e</span><span class="p">,</span> <span class="n">dnf</span><span class="p">,</span> <span class="n">max_distance</span><span class="p">))</span>
|
||||
</span><span id="L-26"><a href="#L-26"><span class="linenos"> 26</span></a> <span class="k">return</span> <span class="n">simplify</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="L-27"><a href="#L-27"><span class="linenos"> 27</span></a>
|
||||
</span><span id="L-28"><a href="#L-28"><span class="linenos"> 28</span></a>
|
||||
</span><span id="L-29"><a href="#L-29"><span class="linenos"> 29</span></a><span class="k">def</span> <span class="nf">normalized</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
|
||||
</span><span id="L-30"><a href="#L-30"><span class="linenos"> 30</span></a> <span class="n">ancestor</span><span class="p">,</span> <span class="n">root</span> <span class="o">=</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">And</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Or</span><span class="p">)</span> <span class="k">if</span> <span class="n">dnf</span> <span class="k">else</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Or</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span><span class="p">)</span>
|
||||
</span><span id="L-31"><a href="#L-31"><span class="linenos"> 31</span></a>
|
||||
</span><span id="L-32"><a href="#L-32"><span class="linenos"> 32</span></a> <span class="k">return</span> <span class="ow">not</span> <span class="nb">any</span><span class="p">(</span><span class="n">connector</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span><span class="n">ancestor</span><span class="p">)</span> <span class="k">for</span> <span class="n">connector</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">root</span><span class="p">))</span>
|
||||
</span><span id="L-33"><a href="#L-33"><span class="linenos"> 33</span></a>
|
||||
</span><span id="L-34"><a href="#L-34"><span class="linenos"> 34</span></a>
|
||||
</span><span id="L-35"><a href="#L-35"><span class="linenos"> 35</span></a><span class="k">def</span> <span class="nf">normalization_distance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
|
||||
</span><span id="L-36"><a href="#L-36"><span class="linenos"> 36</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-37"><a href="#L-37"><span class="linenos"> 37</span></a><span class="sd"> The difference in the number of predicates between the current expression and the normalized form.</span>
|
||||
</span><span id="L-38"><a href="#L-38"><span class="linenos"> 38</span></a>
|
||||
</span><span id="L-39"><a href="#L-39"><span class="linenos"> 39</span></a><span class="sd"> This is used as an estimate of the cost of the conversion which is exponential in complexity.</span>
|
||||
</span><span id="L-40"><a href="#L-40"><span class="linenos"> 40</span></a>
|
||||
</span><span id="L-41"><a href="#L-41"><span class="linenos"> 41</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="L-42"><a href="#L-42"><span class="linenos"> 42</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="L-43"><a href="#L-43"><span class="linenos"> 43</span></a><span class="sd"> >>> expression = sqlglot.parse_one("(a AND b) OR (c AND d)")</span>
|
||||
</span><span id="L-44"><a href="#L-44"><span class="linenos"> 44</span></a><span class="sd"> >>> normalization_distance(expression)</span>
|
||||
</span><span id="L-45"><a href="#L-45"><span class="linenos"> 45</span></a><span class="sd"> 4</span>
|
||||
</span><span id="L-46"><a href="#L-46"><span class="linenos"> 46</span></a>
|
||||
</span><span id="L-47"><a href="#L-47"><span class="linenos"> 47</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-48"><a href="#L-48"><span class="linenos"> 48</span></a><span class="sd"> expression (sqlglot.Expression): expression to compute distance</span>
|
||||
</span><span id="L-49"><a href="#L-49"><span class="linenos"> 49</span></a><span class="sd"> dnf (bool): compute to dnf distance instead</span>
|
||||
</span><span id="L-50"><a href="#L-50"><span class="linenos"> 50</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="L-51"><a href="#L-51"><span class="linenos"> 51</span></a><span class="sd"> int: difference</span>
|
||||
</span><span id="L-52"><a href="#L-52"><span class="linenos"> 52</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-53"><a href="#L-53"><span class="linenos"> 53</span></a> <span class="k">return</span> <span class="nb">sum</span><span class="p">(</span><span class="n">_predicate_lengths</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="p">))</span> <span class="o">-</span> <span class="p">(</span>
|
||||
</span><span id="L-54"><a href="#L-54"><span class="linenos"> 54</span></a> <span class="nb">len</span><span class="p">(</span><span class="nb">list</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">)))</span> <span class="o">+</span> <span class="mi">1</span>
|
||||
</span><span id="L-55"><a href="#L-55"><span class="linenos"> 55</span></a> <span class="p">)</span>
|
||||
</span><span id="L-6"><a href="#L-6"><span class="linenos"> 6</span></a><span class="kn">from</span> <span class="nn">sqlglot</span> <span class="kn">import</span> <span class="n">exp</span>
|
||||
</span><span id="L-7"><a href="#L-7"><span class="linenos"> 7</span></a><span class="kn">from</span> <span class="nn">sqlglot.errors</span> <span class="kn">import</span> <span class="n">OptimizeError</span>
|
||||
</span><span id="L-8"><a href="#L-8"><span class="linenos"> 8</span></a><span class="kn">from</span> <span class="nn">sqlglot.helper</span> <span class="kn">import</span> <span class="n">while_changing</span>
|
||||
</span><span id="L-9"><a href="#L-9"><span class="linenos"> 9</span></a><span class="kn">from</span> <span class="nn">sqlglot.optimizer.simplify</span> <span class="kn">import</span> <span class="n">flatten</span><span class="p">,</span> <span class="n">uniq_sort</span>
|
||||
</span><span id="L-10"><a href="#L-10"><span class="linenos"> 10</span></a>
|
||||
</span><span id="L-11"><a href="#L-11"><span class="linenos"> 11</span></a><span class="n">logger</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="s2">"sqlglot"</span><span class="p">)</span>
|
||||
</span><span id="L-12"><a href="#L-12"><span class="linenos"> 12</span></a>
|
||||
</span><span id="L-13"><a href="#L-13"><span class="linenos"> 13</span></a>
|
||||
</span><span id="L-14"><a href="#L-14"><span class="linenos"> 14</span></a><span class="k">def</span> <span class="nf">normalize</span><span class="p">(</span><span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">,</span> <span class="n">dnf</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">False</span><span class="p">,</span> <span class="n">max_distance</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">128</span><span class="p">):</span>
|
||||
</span><span id="L-15"><a href="#L-15"><span class="linenos"> 15</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-16"><a href="#L-16"><span class="linenos"> 16</span></a><span class="sd"> Rewrite sqlglot AST into conjunctive normal form or disjunctive normal form.</span>
|
||||
</span><span id="L-17"><a href="#L-17"><span class="linenos"> 17</span></a>
|
||||
</span><span id="L-18"><a href="#L-18"><span class="linenos"> 18</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="L-19"><a href="#L-19"><span class="linenos"> 19</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="L-20"><a href="#L-20"><span class="linenos"> 20</span></a><span class="sd"> >>> expression = sqlglot.parse_one("(x AND y) OR z")</span>
|
||||
</span><span id="L-21"><a href="#L-21"><span class="linenos"> 21</span></a><span class="sd"> >>> normalize(expression, dnf=False).sql()</span>
|
||||
</span><span id="L-22"><a href="#L-22"><span class="linenos"> 22</span></a><span class="sd"> '(x OR z) AND (y OR z)'</span>
|
||||
</span><span id="L-23"><a href="#L-23"><span class="linenos"> 23</span></a>
|
||||
</span><span id="L-24"><a href="#L-24"><span class="linenos"> 24</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-25"><a href="#L-25"><span class="linenos"> 25</span></a><span class="sd"> expression: expression to normalize</span>
|
||||
</span><span id="L-26"><a href="#L-26"><span class="linenos"> 26</span></a><span class="sd"> dnf: rewrite in disjunctive normal form instead.</span>
|
||||
</span><span id="L-27"><a href="#L-27"><span class="linenos"> 27</span></a><span class="sd"> max_distance (int): the maximal estimated distance from cnf/dnf to attempt conversion</span>
|
||||
</span><span id="L-28"><a href="#L-28"><span class="linenos"> 28</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="L-29"><a href="#L-29"><span class="linenos"> 29</span></a><span class="sd"> sqlglot.Expression: normalized expression</span>
|
||||
</span><span id="L-30"><a href="#L-30"><span class="linenos"> 30</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-31"><a href="#L-31"><span class="linenos"> 31</span></a> <span class="n">cache</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Dict</span><span class="p">[</span><span class="nb">int</span><span class="p">,</span> <span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="p">{}</span>
|
||||
</span><span id="L-32"><a href="#L-32"><span class="linenos"> 32</span></a>
|
||||
</span><span id="L-33"><a href="#L-33"><span class="linenos"> 33</span></a> <span class="k">for</span> <span class="n">node</span><span class="p">,</span> <span class="o">*</span><span class="n">_</span> <span class="ow">in</span> <span class="nb">tuple</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">walk</span><span class="p">(</span><span class="n">prune</span><span class="o">=</span><span class="k">lambda</span> <span class="n">e</span><span class="p">,</span> <span class="o">*</span><span class="n">_</span><span class="p">:</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">e</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">))):</span>
|
||||
</span><span id="L-34"><a href="#L-34"><span class="linenos"> 34</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">):</span>
|
||||
</span><span id="L-35"><a href="#L-35"><span class="linenos"> 35</span></a> <span class="k">if</span> <span class="n">normalized</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="n">dnf</span><span class="p">):</span>
|
||||
</span><span id="L-36"><a href="#L-36"><span class="linenos"> 36</span></a> <span class="k">continue</span>
|
||||
</span><span id="L-37"><a href="#L-37"><span class="linenos"> 37</span></a>
|
||||
</span><span id="L-38"><a href="#L-38"><span class="linenos"> 38</span></a> <span class="n">distance</span> <span class="o">=</span> <span class="n">normalization_distance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="n">dnf</span><span class="p">)</span>
|
||||
</span><span id="L-39"><a href="#L-39"><span class="linenos"> 39</span></a>
|
||||
</span><span id="L-40"><a href="#L-40"><span class="linenos"> 40</span></a> <span class="k">if</span> <span class="n">distance</span> <span class="o">></span> <span class="n">max_distance</span><span class="p">:</span>
|
||||
</span><span id="L-41"><a href="#L-41"><span class="linenos"> 41</span></a> <span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span>
|
||||
</span><span id="L-42"><a href="#L-42"><span class="linenos"> 42</span></a> <span class="sa">f</span><span class="s2">"Skipping normalization because distance </span><span class="si">{</span><span class="n">distance</span><span class="si">}</span><span class="s2"> exceeds max </span><span class="si">{</span><span class="n">max_distance</span><span class="si">}</span><span class="s2">"</span>
|
||||
</span><span id="L-43"><a href="#L-43"><span class="linenos"> 43</span></a> <span class="p">)</span>
|
||||
</span><span id="L-44"><a href="#L-44"><span class="linenos"> 44</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-45"><a href="#L-45"><span class="linenos"> 45</span></a>
|
||||
</span><span id="L-46"><a href="#L-46"><span class="linenos"> 46</span></a> <span class="n">root</span> <span class="o">=</span> <span class="n">node</span> <span class="ow">is</span> <span class="n">expression</span>
|
||||
</span><span id="L-47"><a href="#L-47"><span class="linenos"> 47</span></a> <span class="n">original</span> <span class="o">=</span> <span class="n">node</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span>
|
||||
</span><span id="L-48"><a href="#L-48"><span class="linenos"> 48</span></a> <span class="k">try</span><span class="p">:</span>
|
||||
</span><span id="L-49"><a href="#L-49"><span class="linenos"> 49</span></a> <span class="n">node</span> <span class="o">=</span> <span class="n">while_changing</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="k">lambda</span> <span class="n">e</span><span class="p">:</span> <span class="n">distributive_law</span><span class="p">(</span><span class="n">e</span><span class="p">,</span> <span class="n">dnf</span><span class="p">,</span> <span class="n">max_distance</span><span class="p">,</span> <span class="n">cache</span><span class="p">))</span>
|
||||
</span><span id="L-50"><a href="#L-50"><span class="linenos"> 50</span></a> <span class="k">except</span> <span class="n">OptimizeError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
|
||||
</span><span id="L-51"><a href="#L-51"><span class="linenos"> 51</span></a> <span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="n">e</span><span class="p">)</span>
|
||||
</span><span id="L-52"><a href="#L-52"><span class="linenos"> 52</span></a> <span class="n">node</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">original</span><span class="p">)</span>
|
||||
</span><span id="L-53"><a href="#L-53"><span class="linenos"> 53</span></a> <span class="k">if</span> <span class="n">root</span><span class="p">:</span>
|
||||
</span><span id="L-54"><a href="#L-54"><span class="linenos"> 54</span></a> <span class="k">return</span> <span class="n">original</span>
|
||||
</span><span id="L-55"><a href="#L-55"><span class="linenos"> 55</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-56"><a href="#L-56"><span class="linenos"> 56</span></a>
|
||||
</span><span id="L-57"><a href="#L-57"><span class="linenos"> 57</span></a>
|
||||
</span><span id="L-58"><a href="#L-58"><span class="linenos"> 58</span></a><span class="k">def</span> <span class="nf">_predicate_lengths</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="p">):</span>
|
||||
</span><span id="L-59"><a href="#L-59"><span class="linenos"> 59</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-60"><a href="#L-60"><span class="linenos"> 60</span></a><span class="sd"> Returns a list of predicate lengths when expanded to normalized form.</span>
|
||||
</span><span id="L-57"><a href="#L-57"><span class="linenos"> 57</span></a> <span class="k">if</span> <span class="n">root</span><span class="p">:</span>
|
||||
</span><span id="L-58"><a href="#L-58"><span class="linenos"> 58</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">node</span>
|
||||
</span><span id="L-59"><a href="#L-59"><span class="linenos"> 59</span></a>
|
||||
</span><span id="L-60"><a href="#L-60"><span class="linenos"> 60</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-61"><a href="#L-61"><span class="linenos"> 61</span></a>
|
||||
</span><span id="L-62"><a href="#L-62"><span class="linenos"> 62</span></a><span class="sd"> (A AND B) OR C -> [2, 2] because len(A OR C), len(B OR C).</span>
|
||||
</span><span id="L-63"><a href="#L-63"><span class="linenos"> 63</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-64"><a href="#L-64"><span class="linenos"> 64</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">unnest</span><span class="p">()</span>
|
||||
</span><span id="L-62"><a href="#L-62"><span class="linenos"> 62</span></a>
|
||||
</span><span id="L-63"><a href="#L-63"><span class="linenos"> 63</span></a><span class="k">def</span> <span class="nf">normalized</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
|
||||
</span><span id="L-64"><a href="#L-64"><span class="linenos"> 64</span></a> <span class="n">ancestor</span><span class="p">,</span> <span class="n">root</span> <span class="o">=</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">And</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Or</span><span class="p">)</span> <span class="k">if</span> <span class="n">dnf</span> <span class="k">else</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Or</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span><span class="p">)</span>
|
||||
</span><span id="L-65"><a href="#L-65"><span class="linenos"> 65</span></a>
|
||||
</span><span id="L-66"><a href="#L-66"><span class="linenos"> 66</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">):</span>
|
||||
</span><span id="L-67"><a href="#L-67"><span class="linenos"> 67</span></a> <span class="k">return</span> <span class="p">[</span><span class="mi">1</span><span class="p">]</span>
|
||||
</span><span id="L-66"><a href="#L-66"><span class="linenos"> 66</span></a> <span class="k">return</span> <span class="ow">not</span> <span class="nb">any</span><span class="p">(</span><span class="n">connector</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span><span class="n">ancestor</span><span class="p">)</span> <span class="k">for</span> <span class="n">connector</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">root</span><span class="p">))</span>
|
||||
</span><span id="L-67"><a href="#L-67"><span class="linenos"> 67</span></a>
|
||||
</span><span id="L-68"><a href="#L-68"><span class="linenos"> 68</span></a>
|
||||
</span><span id="L-69"><a href="#L-69"><span class="linenos"> 69</span></a> <span class="n">left</span><span class="p">,</span> <span class="n">right</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">values</span><span class="p">()</span>
|
||||
</span><span id="L-70"><a href="#L-70"><span class="linenos"> 70</span></a>
|
||||
</span><span id="L-71"><a href="#L-71"><span class="linenos"> 71</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span> <span class="k">if</span> <span class="n">dnf</span> <span class="k">else</span> <span class="n">exp</span><span class="o">.</span><span class="n">Or</span><span class="p">):</span>
|
||||
</span><span id="L-72"><a href="#L-72"><span class="linenos"> 72</span></a> <span class="k">return</span> <span class="p">[</span>
|
||||
</span><span id="L-73"><a href="#L-73"><span class="linenos"> 73</span></a> <span class="n">a</span> <span class="o">+</span> <span class="n">b</span> <span class="k">for</span> <span class="n">a</span> <span class="ow">in</span> <span class="n">_predicate_lengths</span><span class="p">(</span><span class="n">left</span><span class="p">,</span> <span class="n">dnf</span><span class="p">)</span> <span class="k">for</span> <span class="n">b</span> <span class="ow">in</span> <span class="n">_predicate_lengths</span><span class="p">(</span><span class="n">right</span><span class="p">,</span> <span class="n">dnf</span><span class="p">)</span>
|
||||
</span><span id="L-74"><a href="#L-74"><span class="linenos"> 74</span></a> <span class="p">]</span>
|
||||
</span><span id="L-75"><a href="#L-75"><span class="linenos"> 75</span></a> <span class="k">return</span> <span class="n">_predicate_lengths</span><span class="p">(</span><span class="n">left</span><span class="p">,</span> <span class="n">dnf</span><span class="p">)</span> <span class="o">+</span> <span class="n">_predicate_lengths</span><span class="p">(</span><span class="n">right</span><span class="p">,</span> <span class="n">dnf</span><span class="p">)</span>
|
||||
</span><span id="L-76"><a href="#L-76"><span class="linenos"> 76</span></a>
|
||||
</span><span id="L-77"><a href="#L-77"><span class="linenos"> 77</span></a>
|
||||
</span><span id="L-78"><a href="#L-78"><span class="linenos"> 78</span></a><span class="k">def</span> <span class="nf">distributive_law</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="p">,</span> <span class="n">max_distance</span><span class="p">):</span>
|
||||
</span><span id="L-79"><a href="#L-79"><span class="linenos"> 79</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-80"><a href="#L-80"><span class="linenos"> 80</span></a><span class="sd"> x OR (y AND z) -> (x OR y) AND (x OR z)</span>
|
||||
</span><span id="L-81"><a href="#L-81"><span class="linenos"> 81</span></a><span class="sd"> (x AND y) OR (y AND z) -> (x OR y) AND (x OR z) AND (y OR y) AND (y OR z)</span>
|
||||
</span><span id="L-82"><a href="#L-82"><span class="linenos"> 82</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-83"><a href="#L-83"><span class="linenos"> 83</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">unnest</span><span class="p">(),</span> <span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">):</span>
|
||||
</span><span id="L-84"><a href="#L-84"><span class="linenos"> 84</span></a> <span class="k">if</span> <span class="n">normalization_distance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="p">)</span> <span class="o">></span> <span class="n">max_distance</span><span class="p">:</span>
|
||||
</span><span id="L-85"><a href="#L-85"><span class="linenos"> 85</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-86"><a href="#L-86"><span class="linenos"> 86</span></a>
|
||||
</span><span id="L-87"><a href="#L-87"><span class="linenos"> 87</span></a> <span class="n">to_exp</span><span class="p">,</span> <span class="n">from_exp</span> <span class="o">=</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Or</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span><span class="p">)</span> <span class="k">if</span> <span class="n">dnf</span> <span class="k">else</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">And</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Or</span><span class="p">)</span>
|
||||
</span><span id="L-88"><a href="#L-88"><span class="linenos"> 88</span></a>
|
||||
</span><span id="L-89"><a href="#L-89"><span class="linenos"> 89</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">replace_children</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="k">lambda</span> <span class="n">e</span><span class="p">:</span> <span class="n">distributive_law</span><span class="p">(</span><span class="n">e</span><span class="p">,</span> <span class="n">dnf</span><span class="p">,</span> <span class="n">max_distance</span><span class="p">))</span>
|
||||
</span><span id="L-69"><a href="#L-69"><span class="linenos"> 69</span></a><span class="k">def</span> <span class="nf">normalization_distance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
|
||||
</span><span id="L-70"><a href="#L-70"><span class="linenos"> 70</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-71"><a href="#L-71"><span class="linenos"> 71</span></a><span class="sd"> The difference in the number of predicates between the current expression and the normalized form.</span>
|
||||
</span><span id="L-72"><a href="#L-72"><span class="linenos"> 72</span></a>
|
||||
</span><span id="L-73"><a href="#L-73"><span class="linenos"> 73</span></a><span class="sd"> This is used as an estimate of the cost of the conversion which is exponential in complexity.</span>
|
||||
</span><span id="L-74"><a href="#L-74"><span class="linenos"> 74</span></a>
|
||||
</span><span id="L-75"><a href="#L-75"><span class="linenos"> 75</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="L-76"><a href="#L-76"><span class="linenos"> 76</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="L-77"><a href="#L-77"><span class="linenos"> 77</span></a><span class="sd"> >>> expression = sqlglot.parse_one("(a AND b) OR (c AND d)")</span>
|
||||
</span><span id="L-78"><a href="#L-78"><span class="linenos"> 78</span></a><span class="sd"> >>> normalization_distance(expression)</span>
|
||||
</span><span id="L-79"><a href="#L-79"><span class="linenos"> 79</span></a><span class="sd"> 4</span>
|
||||
</span><span id="L-80"><a href="#L-80"><span class="linenos"> 80</span></a>
|
||||
</span><span id="L-81"><a href="#L-81"><span class="linenos"> 81</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="L-82"><a href="#L-82"><span class="linenos"> 82</span></a><span class="sd"> expression (sqlglot.Expression): expression to compute distance</span>
|
||||
</span><span id="L-83"><a href="#L-83"><span class="linenos"> 83</span></a><span class="sd"> dnf (bool): compute to dnf distance instead</span>
|
||||
</span><span id="L-84"><a href="#L-84"><span class="linenos"> 84</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="L-85"><a href="#L-85"><span class="linenos"> 85</span></a><span class="sd"> int: difference</span>
|
||||
</span><span id="L-86"><a href="#L-86"><span class="linenos"> 86</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-87"><a href="#L-87"><span class="linenos"> 87</span></a> <span class="k">return</span> <span class="nb">sum</span><span class="p">(</span><span class="n">_predicate_lengths</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="p">))</span> <span class="o">-</span> <span class="p">(</span>
|
||||
</span><span id="L-88"><a href="#L-88"><span class="linenos"> 88</span></a> <span class="nb">sum</span><span class="p">(</span><span class="mi">1</span> <span class="k">for</span> <span class="n">_</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">))</span> <span class="o">+</span> <span class="mi">1</span>
|
||||
</span><span id="L-89"><a href="#L-89"><span class="linenos"> 89</span></a> <span class="p">)</span>
|
||||
</span><span id="L-90"><a href="#L-90"><span class="linenos"> 90</span></a>
|
||||
</span><span id="L-91"><a href="#L-91"><span class="linenos"> 91</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">from_exp</span><span class="p">):</span>
|
||||
</span><span id="L-92"><a href="#L-92"><span class="linenos"> 92</span></a> <span class="n">a</span><span class="p">,</span> <span class="n">b</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">unnest_operands</span><span class="p">()</span>
|
||||
</span><span id="L-93"><a href="#L-93"><span class="linenos"> 93</span></a>
|
||||
</span><span id="L-94"><a href="#L-94"><span class="linenos"> 94</span></a> <span class="n">from_func</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">and_</span> <span class="k">if</span> <span class="n">from_exp</span> <span class="o">==</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span> <span class="k">else</span> <span class="n">exp</span><span class="o">.</span><span class="n">or_</span>
|
||||
</span><span id="L-95"><a href="#L-95"><span class="linenos"> 95</span></a> <span class="n">to_func</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">and_</span> <span class="k">if</span> <span class="n">to_exp</span> <span class="o">==</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span> <span class="k">else</span> <span class="n">exp</span><span class="o">.</span><span class="n">or_</span>
|
||||
</span><span id="L-96"><a href="#L-96"><span class="linenos"> 96</span></a>
|
||||
</span><span id="L-97"><a href="#L-97"><span class="linenos"> 97</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">to_exp</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="n">to_exp</span><span class="p">):</span>
|
||||
</span><span id="L-98"><a href="#L-98"><span class="linenos"> 98</span></a> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="nb">tuple</span><span class="p">(</span><span class="n">a</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">)))</span> <span class="o">></span> <span class="nb">len</span><span class="p">(</span><span class="nb">tuple</span><span class="p">(</span><span class="n">b</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">))):</span>
|
||||
</span><span id="L-99"><a href="#L-99"><span class="linenos"> 99</span></a> <span class="k">return</span> <span class="n">_distribute</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">from_func</span><span class="p">,</span> <span class="n">to_func</span><span class="p">)</span>
|
||||
</span><span id="L-100"><a href="#L-100"><span class="linenos">100</span></a> <span class="k">return</span> <span class="n">_distribute</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="n">a</span><span class="p">,</span> <span class="n">from_func</span><span class="p">,</span> <span class="n">to_func</span><span class="p">)</span>
|
||||
</span><span id="L-101"><a href="#L-101"><span class="linenos">101</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">to_exp</span><span class="p">):</span>
|
||||
</span><span id="L-102"><a href="#L-102"><span class="linenos">102</span></a> <span class="k">return</span> <span class="n">_distribute</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="n">a</span><span class="p">,</span> <span class="n">from_func</span><span class="p">,</span> <span class="n">to_func</span><span class="p">)</span>
|
||||
</span><span id="L-103"><a href="#L-103"><span class="linenos">103</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="n">to_exp</span><span class="p">):</span>
|
||||
</span><span id="L-104"><a href="#L-104"><span class="linenos">104</span></a> <span class="k">return</span> <span class="n">_distribute</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">from_func</span><span class="p">,</span> <span class="n">to_func</span><span class="p">)</span>
|
||||
</span><span id="L-105"><a href="#L-105"><span class="linenos">105</span></a>
|
||||
</span><span id="L-106"><a href="#L-106"><span class="linenos">106</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-107"><a href="#L-107"><span class="linenos">107</span></a>
|
||||
</span><span id="L-108"><a href="#L-108"><span class="linenos">108</span></a>
|
||||
</span><span id="L-109"><a href="#L-109"><span class="linenos">109</span></a><span class="k">def</span> <span class="nf">_distribute</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">from_func</span><span class="p">,</span> <span class="n">to_func</span><span class="p">):</span>
|
||||
</span><span id="L-110"><a href="#L-110"><span class="linenos">110</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">):</span>
|
||||
</span><span id="L-111"><a href="#L-111"><span class="linenos">111</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">replace_children</span><span class="p">(</span>
|
||||
</span><span id="L-112"><a href="#L-112"><span class="linenos">112</span></a> <span class="n">a</span><span class="p">,</span>
|
||||
</span><span id="L-113"><a href="#L-113"><span class="linenos">113</span></a> <span class="k">lambda</span> <span class="n">c</span><span class="p">:</span> <span class="n">to_func</span><span class="p">(</span>
|
||||
</span><span id="L-114"><a href="#L-114"><span class="linenos">114</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">paren</span><span class="p">(</span><span class="n">from_func</span><span class="p">(</span><span class="n">c</span><span class="p">,</span> <span class="n">b</span><span class="o">.</span><span class="n">left</span><span class="p">)),</span>
|
||||
</span><span id="L-115"><a href="#L-115"><span class="linenos">115</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">paren</span><span class="p">(</span><span class="n">from_func</span><span class="p">(</span><span class="n">c</span><span class="p">,</span> <span class="n">b</span><span class="o">.</span><span class="n">right</span><span class="p">)),</span>
|
||||
</span><span id="L-116"><a href="#L-116"><span class="linenos">116</span></a> <span class="p">),</span>
|
||||
</span><span id="L-117"><a href="#L-117"><span class="linenos">117</span></a> <span class="p">)</span>
|
||||
</span><span id="L-118"><a href="#L-118"><span class="linenos">118</span></a> <span class="k">else</span><span class="p">:</span>
|
||||
</span><span id="L-119"><a href="#L-119"><span class="linenos">119</span></a> <span class="n">a</span> <span class="o">=</span> <span class="n">to_func</span><span class="p">(</span><span class="n">from_func</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="o">.</span><span class="n">left</span><span class="p">),</span> <span class="n">from_func</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="o">.</span><span class="n">right</span><span class="p">))</span>
|
||||
</span><span id="L-120"><a href="#L-120"><span class="linenos">120</span></a>
|
||||
</span><span id="L-121"><a href="#L-121"><span class="linenos">121</span></a> <span class="k">return</span> <span class="n">_simplify</span><span class="p">(</span><span class="n">a</span><span class="p">)</span>
|
||||
</span><span id="L-122"><a href="#L-122"><span class="linenos">122</span></a>
|
||||
</span><span id="L-123"><a href="#L-123"><span class="linenos">123</span></a>
|
||||
</span><span id="L-124"><a href="#L-124"><span class="linenos">124</span></a><span class="k">def</span> <span class="nf">_simplify</span><span class="p">(</span><span class="n">node</span><span class="p">):</span>
|
||||
</span><span id="L-125"><a href="#L-125"><span class="linenos">125</span></a> <span class="n">node</span> <span class="o">=</span> <span class="n">uniq_sort</span><span class="p">(</span><span class="n">flatten</span><span class="p">(</span><span class="n">node</span><span class="p">))</span>
|
||||
</span><span id="L-126"><a href="#L-126"><span class="linenos">126</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">replace_children</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">_simplify</span><span class="p">)</span>
|
||||
</span><span id="L-127"><a href="#L-127"><span class="linenos">127</span></a> <span class="k">return</span> <span class="n">node</span>
|
||||
</span><span id="L-91"><a href="#L-91"><span class="linenos"> 91</span></a>
|
||||
</span><span id="L-92"><a href="#L-92"><span class="linenos"> 92</span></a><span class="k">def</span> <span class="nf">_predicate_lengths</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="p">):</span>
|
||||
</span><span id="L-93"><a href="#L-93"><span class="linenos"> 93</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-94"><a href="#L-94"><span class="linenos"> 94</span></a><span class="sd"> Returns a list of predicate lengths when expanded to normalized form.</span>
|
||||
</span><span id="L-95"><a href="#L-95"><span class="linenos"> 95</span></a>
|
||||
</span><span id="L-96"><a href="#L-96"><span class="linenos"> 96</span></a><span class="sd"> (A AND B) OR C -> [2, 2] because len(A OR C), len(B OR C).</span>
|
||||
</span><span id="L-97"><a href="#L-97"><span class="linenos"> 97</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-98"><a href="#L-98"><span class="linenos"> 98</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">unnest</span><span class="p">()</span>
|
||||
</span><span id="L-99"><a href="#L-99"><span class="linenos"> 99</span></a>
|
||||
</span><span id="L-100"><a href="#L-100"><span class="linenos">100</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">):</span>
|
||||
</span><span id="L-101"><a href="#L-101"><span class="linenos">101</span></a> <span class="k">return</span> <span class="p">(</span><span class="mi">1</span><span class="p">,)</span>
|
||||
</span><span id="L-102"><a href="#L-102"><span class="linenos">102</span></a>
|
||||
</span><span id="L-103"><a href="#L-103"><span class="linenos">103</span></a> <span class="n">left</span><span class="p">,</span> <span class="n">right</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">values</span><span class="p">()</span>
|
||||
</span><span id="L-104"><a href="#L-104"><span class="linenos">104</span></a>
|
||||
</span><span id="L-105"><a href="#L-105"><span class="linenos">105</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span> <span class="k">if</span> <span class="n">dnf</span> <span class="k">else</span> <span class="n">exp</span><span class="o">.</span><span class="n">Or</span><span class="p">):</span>
|
||||
</span><span id="L-106"><a href="#L-106"><span class="linenos">106</span></a> <span class="k">return</span> <span class="nb">tuple</span><span class="p">(</span>
|
||||
</span><span id="L-107"><a href="#L-107"><span class="linenos">107</span></a> <span class="n">a</span> <span class="o">+</span> <span class="n">b</span> <span class="k">for</span> <span class="n">a</span> <span class="ow">in</span> <span class="n">_predicate_lengths</span><span class="p">(</span><span class="n">left</span><span class="p">,</span> <span class="n">dnf</span><span class="p">)</span> <span class="k">for</span> <span class="n">b</span> <span class="ow">in</span> <span class="n">_predicate_lengths</span><span class="p">(</span><span class="n">right</span><span class="p">,</span> <span class="n">dnf</span><span class="p">)</span>
|
||||
</span><span id="L-108"><a href="#L-108"><span class="linenos">108</span></a> <span class="p">)</span>
|
||||
</span><span id="L-109"><a href="#L-109"><span class="linenos">109</span></a> <span class="k">return</span> <span class="n">_predicate_lengths</span><span class="p">(</span><span class="n">left</span><span class="p">,</span> <span class="n">dnf</span><span class="p">)</span> <span class="o">+</span> <span class="n">_predicate_lengths</span><span class="p">(</span><span class="n">right</span><span class="p">,</span> <span class="n">dnf</span><span class="p">)</span>
|
||||
</span><span id="L-110"><a href="#L-110"><span class="linenos">110</span></a>
|
||||
</span><span id="L-111"><a href="#L-111"><span class="linenos">111</span></a>
|
||||
</span><span id="L-112"><a href="#L-112"><span class="linenos">112</span></a><span class="k">def</span> <span class="nf">distributive_law</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="p">,</span> <span class="n">max_distance</span><span class="p">,</span> <span class="n">cache</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
|
||||
</span><span id="L-113"><a href="#L-113"><span class="linenos">113</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-114"><a href="#L-114"><span class="linenos">114</span></a><span class="sd"> x OR (y AND z) -> (x OR y) AND (x OR z)</span>
|
||||
</span><span id="L-115"><a href="#L-115"><span class="linenos">115</span></a><span class="sd"> (x AND y) OR (y AND z) -> (x OR y) AND (x OR z) AND (y OR y) AND (y OR z)</span>
|
||||
</span><span id="L-116"><a href="#L-116"><span class="linenos">116</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-117"><a href="#L-117"><span class="linenos">117</span></a> <span class="k">if</span> <span class="n">normalized</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="n">dnf</span><span class="p">):</span>
|
||||
</span><span id="L-118"><a href="#L-118"><span class="linenos">118</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-119"><a href="#L-119"><span class="linenos">119</span></a>
|
||||
</span><span id="L-120"><a href="#L-120"><span class="linenos">120</span></a> <span class="n">distance</span> <span class="o">=</span> <span class="n">normalization_distance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="n">dnf</span><span class="p">)</span>
|
||||
</span><span id="L-121"><a href="#L-121"><span class="linenos">121</span></a>
|
||||
</span><span id="L-122"><a href="#L-122"><span class="linenos">122</span></a> <span class="k">if</span> <span class="n">distance</span> <span class="o">></span> <span class="n">max_distance</span><span class="p">:</span>
|
||||
</span><span id="L-123"><a href="#L-123"><span class="linenos">123</span></a> <span class="k">raise</span> <span class="n">OptimizeError</span><span class="p">(</span><span class="sa">f</span><span class="s2">"Normalization distance </span><span class="si">{</span><span class="n">distance</span><span class="si">}</span><span class="s2"> exceeds max </span><span class="si">{</span><span class="n">max_distance</span><span class="si">}</span><span class="s2">"</span><span class="p">)</span>
|
||||
</span><span id="L-124"><a href="#L-124"><span class="linenos">124</span></a>
|
||||
</span><span id="L-125"><a href="#L-125"><span class="linenos">125</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">replace_children</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="k">lambda</span> <span class="n">e</span><span class="p">:</span> <span class="n">distributive_law</span><span class="p">(</span><span class="n">e</span><span class="p">,</span> <span class="n">dnf</span><span class="p">,</span> <span class="n">max_distance</span><span class="p">,</span> <span class="n">cache</span><span class="p">))</span>
|
||||
</span><span id="L-126"><a href="#L-126"><span class="linenos">126</span></a> <span class="n">to_exp</span><span class="p">,</span> <span class="n">from_exp</span> <span class="o">=</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Or</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span><span class="p">)</span> <span class="k">if</span> <span class="n">dnf</span> <span class="k">else</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">And</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Or</span><span class="p">)</span>
|
||||
</span><span id="L-127"><a href="#L-127"><span class="linenos">127</span></a>
|
||||
</span><span id="L-128"><a href="#L-128"><span class="linenos">128</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">from_exp</span><span class="p">):</span>
|
||||
</span><span id="L-129"><a href="#L-129"><span class="linenos">129</span></a> <span class="n">a</span><span class="p">,</span> <span class="n">b</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">unnest_operands</span><span class="p">()</span>
|
||||
</span><span id="L-130"><a href="#L-130"><span class="linenos">130</span></a>
|
||||
</span><span id="L-131"><a href="#L-131"><span class="linenos">131</span></a> <span class="n">from_func</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">and_</span> <span class="k">if</span> <span class="n">from_exp</span> <span class="o">==</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span> <span class="k">else</span> <span class="n">exp</span><span class="o">.</span><span class="n">or_</span>
|
||||
</span><span id="L-132"><a href="#L-132"><span class="linenos">132</span></a> <span class="n">to_func</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">and_</span> <span class="k">if</span> <span class="n">to_exp</span> <span class="o">==</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span> <span class="k">else</span> <span class="n">exp</span><span class="o">.</span><span class="n">or_</span>
|
||||
</span><span id="L-133"><a href="#L-133"><span class="linenos">133</span></a>
|
||||
</span><span id="L-134"><a href="#L-134"><span class="linenos">134</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">to_exp</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="n">to_exp</span><span class="p">):</span>
|
||||
</span><span id="L-135"><a href="#L-135"><span class="linenos">135</span></a> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="nb">tuple</span><span class="p">(</span><span class="n">a</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">)))</span> <span class="o">></span> <span class="nb">len</span><span class="p">(</span><span class="nb">tuple</span><span class="p">(</span><span class="n">b</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">))):</span>
|
||||
</span><span id="L-136"><a href="#L-136"><span class="linenos">136</span></a> <span class="k">return</span> <span class="n">_distribute</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">from_func</span><span class="p">,</span> <span class="n">to_func</span><span class="p">,</span> <span class="n">cache</span><span class="p">)</span>
|
||||
</span><span id="L-137"><a href="#L-137"><span class="linenos">137</span></a> <span class="k">return</span> <span class="n">_distribute</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="n">a</span><span class="p">,</span> <span class="n">from_func</span><span class="p">,</span> <span class="n">to_func</span><span class="p">,</span> <span class="n">cache</span><span class="p">)</span>
|
||||
</span><span id="L-138"><a href="#L-138"><span class="linenos">138</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">to_exp</span><span class="p">):</span>
|
||||
</span><span id="L-139"><a href="#L-139"><span class="linenos">139</span></a> <span class="k">return</span> <span class="n">_distribute</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="n">a</span><span class="p">,</span> <span class="n">from_func</span><span class="p">,</span> <span class="n">to_func</span><span class="p">,</span> <span class="n">cache</span><span class="p">)</span>
|
||||
</span><span id="L-140"><a href="#L-140"><span class="linenos">140</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="n">to_exp</span><span class="p">):</span>
|
||||
</span><span id="L-141"><a href="#L-141"><span class="linenos">141</span></a> <span class="k">return</span> <span class="n">_distribute</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">from_func</span><span class="p">,</span> <span class="n">to_func</span><span class="p">,</span> <span class="n">cache</span><span class="p">)</span>
|
||||
</span><span id="L-142"><a href="#L-142"><span class="linenos">142</span></a>
|
||||
</span><span id="L-143"><a href="#L-143"><span class="linenos">143</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-144"><a href="#L-144"><span class="linenos">144</span></a>
|
||||
</span><span id="L-145"><a href="#L-145"><span class="linenos">145</span></a>
|
||||
</span><span id="L-146"><a href="#L-146"><span class="linenos">146</span></a><span class="k">def</span> <span class="nf">_distribute</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">from_func</span><span class="p">,</span> <span class="n">to_func</span><span class="p">,</span> <span class="n">cache</span><span class="p">):</span>
|
||||
</span><span id="L-147"><a href="#L-147"><span class="linenos">147</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">):</span>
|
||||
</span><span id="L-148"><a href="#L-148"><span class="linenos">148</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">replace_children</span><span class="p">(</span>
|
||||
</span><span id="L-149"><a href="#L-149"><span class="linenos">149</span></a> <span class="n">a</span><span class="p">,</span>
|
||||
</span><span id="L-150"><a href="#L-150"><span class="linenos">150</span></a> <span class="k">lambda</span> <span class="n">c</span><span class="p">:</span> <span class="n">to_func</span><span class="p">(</span>
|
||||
</span><span id="L-151"><a href="#L-151"><span class="linenos">151</span></a> <span class="n">uniq_sort</span><span class="p">(</span><span class="n">flatten</span><span class="p">(</span><span class="n">from_func</span><span class="p">(</span><span class="n">c</span><span class="p">,</span> <span class="n">b</span><span class="o">.</span><span class="n">left</span><span class="p">)),</span> <span class="n">cache</span><span class="p">),</span>
|
||||
</span><span id="L-152"><a href="#L-152"><span class="linenos">152</span></a> <span class="n">uniq_sort</span><span class="p">(</span><span class="n">flatten</span><span class="p">(</span><span class="n">from_func</span><span class="p">(</span><span class="n">c</span><span class="p">,</span> <span class="n">b</span><span class="o">.</span><span class="n">right</span><span class="p">)),</span> <span class="n">cache</span><span class="p">),</span>
|
||||
</span><span id="L-153"><a href="#L-153"><span class="linenos">153</span></a> <span class="p">),</span>
|
||||
</span><span id="L-154"><a href="#L-154"><span class="linenos">154</span></a> <span class="p">)</span>
|
||||
</span><span id="L-155"><a href="#L-155"><span class="linenos">155</span></a> <span class="k">else</span><span class="p">:</span>
|
||||
</span><span id="L-156"><a href="#L-156"><span class="linenos">156</span></a> <span class="n">a</span> <span class="o">=</span> <span class="n">to_func</span><span class="p">(</span>
|
||||
</span><span id="L-157"><a href="#L-157"><span class="linenos">157</span></a> <span class="n">uniq_sort</span><span class="p">(</span><span class="n">flatten</span><span class="p">(</span><span class="n">from_func</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="o">.</span><span class="n">left</span><span class="p">)),</span> <span class="n">cache</span><span class="p">),</span>
|
||||
</span><span id="L-158"><a href="#L-158"><span class="linenos">158</span></a> <span class="n">uniq_sort</span><span class="p">(</span><span class="n">flatten</span><span class="p">(</span><span class="n">from_func</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="o">.</span><span class="n">right</span><span class="p">)),</span> <span class="n">cache</span><span class="p">),</span>
|
||||
</span><span id="L-159"><a href="#L-159"><span class="linenos">159</span></a> <span class="p">)</span>
|
||||
</span><span id="L-160"><a href="#L-160"><span class="linenos">160</span></a>
|
||||
</span><span id="L-161"><a href="#L-161"><span class="linenos">161</span></a> <span class="k">return</span> <span class="n">a</span>
|
||||
</span></pre></div>
|
||||
|
||||
|
||||
|
|
@ -201,37 +235,63 @@
|
|||
<div class="attr function">
|
||||
|
||||
<span class="def">def</span>
|
||||
<span class="name">normalize</span><span class="signature pdoc-code condensed">(<span class="param"><span class="n">expression</span>, </span><span class="param"><span class="n">dnf</span><span class="o">=</span><span class="kc">False</span>, </span><span class="param"><span class="n">max_distance</span><span class="o">=</span><span class="mi">128</span></span><span class="return-annotation">):</span></span>
|
||||
<span class="name">normalize</span><span class="signature pdoc-code multiline">(<span class="param"> <span class="n">expression</span><span class="p">:</span> <span class="n"><a href="../expressions.html#Expression">sqlglot.expressions.Expression</a></span>,</span><span class="param"> <span class="n">dnf</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">False</span>,</span><span class="param"> <span class="n">max_distance</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">128</span></span><span class="return-annotation">):</span></span>
|
||||
|
||||
<label class="view-source-button" for="normalize-view-source"><span>View Source</span></label>
|
||||
|
||||
</div>
|
||||
<a class="headerlink" href="#normalize"></a>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="normalize-7"><a href="#normalize-7"><span class="linenos"> 7</span></a><span class="k">def</span> <span class="nf">normalize</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">max_distance</span><span class="o">=</span><span class="mi">128</span><span class="p">):</span>
|
||||
</span><span id="normalize-8"><a href="#normalize-8"><span class="linenos"> 8</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="normalize-9"><a href="#normalize-9"><span class="linenos"> 9</span></a><span class="sd"> Rewrite sqlglot AST into conjunctive normal form.</span>
|
||||
</span><span id="normalize-10"><a href="#normalize-10"><span class="linenos">10</span></a>
|
||||
</span><span id="normalize-11"><a href="#normalize-11"><span class="linenos">11</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="normalize-12"><a href="#normalize-12"><span class="linenos">12</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="normalize-13"><a href="#normalize-13"><span class="linenos">13</span></a><span class="sd"> >>> expression = sqlglot.parse_one("(x AND y) OR z")</span>
|
||||
</span><span id="normalize-14"><a href="#normalize-14"><span class="linenos">14</span></a><span class="sd"> >>> normalize(expression).sql()</span>
|
||||
</span><span id="normalize-15"><a href="#normalize-15"><span class="linenos">15</span></a><span class="sd"> '(x OR z) AND (y OR z)'</span>
|
||||
</span><span id="normalize-16"><a href="#normalize-16"><span class="linenos">16</span></a>
|
||||
</span><span id="normalize-17"><a href="#normalize-17"><span class="linenos">17</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="normalize-18"><a href="#normalize-18"><span class="linenos">18</span></a><span class="sd"> expression (sqlglot.Expression): expression to normalize</span>
|
||||
</span><span id="normalize-19"><a href="#normalize-19"><span class="linenos">19</span></a><span class="sd"> dnf (bool): rewrite in disjunctive normal form instead</span>
|
||||
</span><span id="normalize-20"><a href="#normalize-20"><span class="linenos">20</span></a><span class="sd"> max_distance (int): the maximal estimated distance from cnf to attempt conversion</span>
|
||||
</span><span id="normalize-21"><a href="#normalize-21"><span class="linenos">21</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="normalize-22"><a href="#normalize-22"><span class="linenos">22</span></a><span class="sd"> sqlglot.Expression: normalized expression</span>
|
||||
</span><span id="normalize-23"><a href="#normalize-23"><span class="linenos">23</span></a><span class="sd"> """</span>
|
||||
</span><span id="normalize-24"><a href="#normalize-24"><span class="linenos">24</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">simplify</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="normalize-25"><a href="#normalize-25"><span class="linenos">25</span></a>
|
||||
</span><span id="normalize-26"><a href="#normalize-26"><span class="linenos">26</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">while_changing</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="k">lambda</span> <span class="n">e</span><span class="p">:</span> <span class="n">distributive_law</span><span class="p">(</span><span class="n">e</span><span class="p">,</span> <span class="n">dnf</span><span class="p">,</span> <span class="n">max_distance</span><span class="p">))</span>
|
||||
</span><span id="normalize-27"><a href="#normalize-27"><span class="linenos">27</span></a> <span class="k">return</span> <span class="n">simplify</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="normalize-15"><a href="#normalize-15"><span class="linenos">15</span></a><span class="k">def</span> <span class="nf">normalize</span><span class="p">(</span><span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">,</span> <span class="n">dnf</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">False</span><span class="p">,</span> <span class="n">max_distance</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">128</span><span class="p">):</span>
|
||||
</span><span id="normalize-16"><a href="#normalize-16"><span class="linenos">16</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="normalize-17"><a href="#normalize-17"><span class="linenos">17</span></a><span class="sd"> Rewrite sqlglot AST into conjunctive normal form or disjunctive normal form.</span>
|
||||
</span><span id="normalize-18"><a href="#normalize-18"><span class="linenos">18</span></a>
|
||||
</span><span id="normalize-19"><a href="#normalize-19"><span class="linenos">19</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="normalize-20"><a href="#normalize-20"><span class="linenos">20</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="normalize-21"><a href="#normalize-21"><span class="linenos">21</span></a><span class="sd"> >>> expression = sqlglot.parse_one("(x AND y) OR z")</span>
|
||||
</span><span id="normalize-22"><a href="#normalize-22"><span class="linenos">22</span></a><span class="sd"> >>> normalize(expression, dnf=False).sql()</span>
|
||||
</span><span id="normalize-23"><a href="#normalize-23"><span class="linenos">23</span></a><span class="sd"> '(x OR z) AND (y OR z)'</span>
|
||||
</span><span id="normalize-24"><a href="#normalize-24"><span class="linenos">24</span></a>
|
||||
</span><span id="normalize-25"><a href="#normalize-25"><span class="linenos">25</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="normalize-26"><a href="#normalize-26"><span class="linenos">26</span></a><span class="sd"> expression: expression to normalize</span>
|
||||
</span><span id="normalize-27"><a href="#normalize-27"><span class="linenos">27</span></a><span class="sd"> dnf: rewrite in disjunctive normal form instead.</span>
|
||||
</span><span id="normalize-28"><a href="#normalize-28"><span class="linenos">28</span></a><span class="sd"> max_distance (int): the maximal estimated distance from cnf/dnf to attempt conversion</span>
|
||||
</span><span id="normalize-29"><a href="#normalize-29"><span class="linenos">29</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="normalize-30"><a href="#normalize-30"><span class="linenos">30</span></a><span class="sd"> sqlglot.Expression: normalized expression</span>
|
||||
</span><span id="normalize-31"><a href="#normalize-31"><span class="linenos">31</span></a><span class="sd"> """</span>
|
||||
</span><span id="normalize-32"><a href="#normalize-32"><span class="linenos">32</span></a> <span class="n">cache</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Dict</span><span class="p">[</span><span class="nb">int</span><span class="p">,</span> <span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="p">{}</span>
|
||||
</span><span id="normalize-33"><a href="#normalize-33"><span class="linenos">33</span></a>
|
||||
</span><span id="normalize-34"><a href="#normalize-34"><span class="linenos">34</span></a> <span class="k">for</span> <span class="n">node</span><span class="p">,</span> <span class="o">*</span><span class="n">_</span> <span class="ow">in</span> <span class="nb">tuple</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">walk</span><span class="p">(</span><span class="n">prune</span><span class="o">=</span><span class="k">lambda</span> <span class="n">e</span><span class="p">,</span> <span class="o">*</span><span class="n">_</span><span class="p">:</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">e</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">))):</span>
|
||||
</span><span id="normalize-35"><a href="#normalize-35"><span class="linenos">35</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">):</span>
|
||||
</span><span id="normalize-36"><a href="#normalize-36"><span class="linenos">36</span></a> <span class="k">if</span> <span class="n">normalized</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="n">dnf</span><span class="p">):</span>
|
||||
</span><span id="normalize-37"><a href="#normalize-37"><span class="linenos">37</span></a> <span class="k">continue</span>
|
||||
</span><span id="normalize-38"><a href="#normalize-38"><span class="linenos">38</span></a>
|
||||
</span><span id="normalize-39"><a href="#normalize-39"><span class="linenos">39</span></a> <span class="n">distance</span> <span class="o">=</span> <span class="n">normalization_distance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="n">dnf</span><span class="p">)</span>
|
||||
</span><span id="normalize-40"><a href="#normalize-40"><span class="linenos">40</span></a>
|
||||
</span><span id="normalize-41"><a href="#normalize-41"><span class="linenos">41</span></a> <span class="k">if</span> <span class="n">distance</span> <span class="o">></span> <span class="n">max_distance</span><span class="p">:</span>
|
||||
</span><span id="normalize-42"><a href="#normalize-42"><span class="linenos">42</span></a> <span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span>
|
||||
</span><span id="normalize-43"><a href="#normalize-43"><span class="linenos">43</span></a> <span class="sa">f</span><span class="s2">"Skipping normalization because distance </span><span class="si">{</span><span class="n">distance</span><span class="si">}</span><span class="s2"> exceeds max </span><span class="si">{</span><span class="n">max_distance</span><span class="si">}</span><span class="s2">"</span>
|
||||
</span><span id="normalize-44"><a href="#normalize-44"><span class="linenos">44</span></a> <span class="p">)</span>
|
||||
</span><span id="normalize-45"><a href="#normalize-45"><span class="linenos">45</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="normalize-46"><a href="#normalize-46"><span class="linenos">46</span></a>
|
||||
</span><span id="normalize-47"><a href="#normalize-47"><span class="linenos">47</span></a> <span class="n">root</span> <span class="o">=</span> <span class="n">node</span> <span class="ow">is</span> <span class="n">expression</span>
|
||||
</span><span id="normalize-48"><a href="#normalize-48"><span class="linenos">48</span></a> <span class="n">original</span> <span class="o">=</span> <span class="n">node</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span>
|
||||
</span><span id="normalize-49"><a href="#normalize-49"><span class="linenos">49</span></a> <span class="k">try</span><span class="p">:</span>
|
||||
</span><span id="normalize-50"><a href="#normalize-50"><span class="linenos">50</span></a> <span class="n">node</span> <span class="o">=</span> <span class="n">while_changing</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="k">lambda</span> <span class="n">e</span><span class="p">:</span> <span class="n">distributive_law</span><span class="p">(</span><span class="n">e</span><span class="p">,</span> <span class="n">dnf</span><span class="p">,</span> <span class="n">max_distance</span><span class="p">,</span> <span class="n">cache</span><span class="p">))</span>
|
||||
</span><span id="normalize-51"><a href="#normalize-51"><span class="linenos">51</span></a> <span class="k">except</span> <span class="n">OptimizeError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
|
||||
</span><span id="normalize-52"><a href="#normalize-52"><span class="linenos">52</span></a> <span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="n">e</span><span class="p">)</span>
|
||||
</span><span id="normalize-53"><a href="#normalize-53"><span class="linenos">53</span></a> <span class="n">node</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">original</span><span class="p">)</span>
|
||||
</span><span id="normalize-54"><a href="#normalize-54"><span class="linenos">54</span></a> <span class="k">if</span> <span class="n">root</span><span class="p">:</span>
|
||||
</span><span id="normalize-55"><a href="#normalize-55"><span class="linenos">55</span></a> <span class="k">return</span> <span class="n">original</span>
|
||||
</span><span id="normalize-56"><a href="#normalize-56"><span class="linenos">56</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="normalize-57"><a href="#normalize-57"><span class="linenos">57</span></a>
|
||||
</span><span id="normalize-58"><a href="#normalize-58"><span class="linenos">58</span></a> <span class="k">if</span> <span class="n">root</span><span class="p">:</span>
|
||||
</span><span id="normalize-59"><a href="#normalize-59"><span class="linenos">59</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">node</span>
|
||||
</span><span id="normalize-60"><a href="#normalize-60"><span class="linenos">60</span></a>
|
||||
</span><span id="normalize-61"><a href="#normalize-61"><span class="linenos">61</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span></pre></div>
|
||||
|
||||
|
||||
<div class="docstring"><p>Rewrite sqlglot AST into conjunctive normal form.</p>
|
||||
<div class="docstring"><p>Rewrite sqlglot AST into conjunctive normal form or disjunctive normal form.</p>
|
||||
|
||||
<h6 id="example">Example:</h6>
|
||||
|
||||
|
|
@ -239,7 +299,7 @@
|
|||
<div class="pdoc-code codehilite">
|
||||
<pre><span></span><code><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">sqlglot</span>
|
||||
<span class="gp">>>> </span><span class="n">expression</span> <span class="o">=</span> <span class="n"><a href="../../sqlglot.html#parse_one">sqlglot.parse_one</a></span><span class="p">(</span><span class="s2">"(x AND y) OR z"</span><span class="p">)</span>
|
||||
<span class="gp">>>> </span><span class="n">normalize</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span><span class="o">.</span><span class="n">sql</span><span class="p">()</span>
|
||||
<span class="gp">>>> </span><span class="n">normalize</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span><span class="o">.</span><span class="n">sql</span><span class="p">()</span>
|
||||
<span class="go">'(x OR z) AND (y OR z)'</span>
|
||||
</code></pre>
|
||||
</div>
|
||||
|
|
@ -248,9 +308,9 @@
|
|||
<h6 id="arguments">Arguments:</h6>
|
||||
|
||||
<ul>
|
||||
<li><strong>expression (sqlglot.Expression):</strong> expression to normalize</li>
|
||||
<li><strong>dnf (bool):</strong> rewrite in disjunctive normal form instead</li>
|
||||
<li><strong>max_distance (int):</strong> the maximal estimated distance from cnf to attempt conversion</li>
|
||||
<li><strong>expression:</strong> expression to normalize</li>
|
||||
<li><strong>dnf:</strong> rewrite in disjunctive normal form instead.</li>
|
||||
<li><strong>max_distance (int):</strong> the maximal estimated distance from cnf/dnf to attempt conversion</li>
|
||||
</ul>
|
||||
|
||||
<h6 id="returns">Returns:</h6>
|
||||
|
|
@ -273,10 +333,10 @@
|
|||
|
||||
</div>
|
||||
<a class="headerlink" href="#normalized"></a>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="normalized-30"><a href="#normalized-30"><span class="linenos">30</span></a><span class="k">def</span> <span class="nf">normalized</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
|
||||
</span><span id="normalized-31"><a href="#normalized-31"><span class="linenos">31</span></a> <span class="n">ancestor</span><span class="p">,</span> <span class="n">root</span> <span class="o">=</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">And</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Or</span><span class="p">)</span> <span class="k">if</span> <span class="n">dnf</span> <span class="k">else</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Or</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span><span class="p">)</span>
|
||||
</span><span id="normalized-32"><a href="#normalized-32"><span class="linenos">32</span></a>
|
||||
</span><span id="normalized-33"><a href="#normalized-33"><span class="linenos">33</span></a> <span class="k">return</span> <span class="ow">not</span> <span class="nb">any</span><span class="p">(</span><span class="n">connector</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span><span class="n">ancestor</span><span class="p">)</span> <span class="k">for</span> <span class="n">connector</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">root</span><span class="p">))</span>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="normalized-64"><a href="#normalized-64"><span class="linenos">64</span></a><span class="k">def</span> <span class="nf">normalized</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
|
||||
</span><span id="normalized-65"><a href="#normalized-65"><span class="linenos">65</span></a> <span class="n">ancestor</span><span class="p">,</span> <span class="n">root</span> <span class="o">=</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">And</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Or</span><span class="p">)</span> <span class="k">if</span> <span class="n">dnf</span> <span class="k">else</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Or</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span><span class="p">)</span>
|
||||
</span><span id="normalized-66"><a href="#normalized-66"><span class="linenos">66</span></a>
|
||||
</span><span id="normalized-67"><a href="#normalized-67"><span class="linenos">67</span></a> <span class="k">return</span> <span class="ow">not</span> <span class="nb">any</span><span class="p">(</span><span class="n">connector</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span><span class="n">ancestor</span><span class="p">)</span> <span class="k">for</span> <span class="n">connector</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">root</span><span class="p">))</span>
|
||||
</span></pre></div>
|
||||
|
||||
|
||||
|
|
@ -294,27 +354,27 @@
|
|||
|
||||
</div>
|
||||
<a class="headerlink" href="#normalization_distance"></a>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="normalization_distance-36"><a href="#normalization_distance-36"><span class="linenos">36</span></a><span class="k">def</span> <span class="nf">normalization_distance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
|
||||
</span><span id="normalization_distance-37"><a href="#normalization_distance-37"><span class="linenos">37</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="normalization_distance-38"><a href="#normalization_distance-38"><span class="linenos">38</span></a><span class="sd"> The difference in the number of predicates between the current expression and the normalized form.</span>
|
||||
</span><span id="normalization_distance-39"><a href="#normalization_distance-39"><span class="linenos">39</span></a>
|
||||
</span><span id="normalization_distance-40"><a href="#normalization_distance-40"><span class="linenos">40</span></a><span class="sd"> This is used as an estimate of the cost of the conversion which is exponential in complexity.</span>
|
||||
</span><span id="normalization_distance-41"><a href="#normalization_distance-41"><span class="linenos">41</span></a>
|
||||
</span><span id="normalization_distance-42"><a href="#normalization_distance-42"><span class="linenos">42</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="normalization_distance-43"><a href="#normalization_distance-43"><span class="linenos">43</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="normalization_distance-44"><a href="#normalization_distance-44"><span class="linenos">44</span></a><span class="sd"> >>> expression = sqlglot.parse_one("(a AND b) OR (c AND d)")</span>
|
||||
</span><span id="normalization_distance-45"><a href="#normalization_distance-45"><span class="linenos">45</span></a><span class="sd"> >>> normalization_distance(expression)</span>
|
||||
</span><span id="normalization_distance-46"><a href="#normalization_distance-46"><span class="linenos">46</span></a><span class="sd"> 4</span>
|
||||
</span><span id="normalization_distance-47"><a href="#normalization_distance-47"><span class="linenos">47</span></a>
|
||||
</span><span id="normalization_distance-48"><a href="#normalization_distance-48"><span class="linenos">48</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="normalization_distance-49"><a href="#normalization_distance-49"><span class="linenos">49</span></a><span class="sd"> expression (sqlglot.Expression): expression to compute distance</span>
|
||||
</span><span id="normalization_distance-50"><a href="#normalization_distance-50"><span class="linenos">50</span></a><span class="sd"> dnf (bool): compute to dnf distance instead</span>
|
||||
</span><span id="normalization_distance-51"><a href="#normalization_distance-51"><span class="linenos">51</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="normalization_distance-52"><a href="#normalization_distance-52"><span class="linenos">52</span></a><span class="sd"> int: difference</span>
|
||||
</span><span id="normalization_distance-53"><a href="#normalization_distance-53"><span class="linenos">53</span></a><span class="sd"> """</span>
|
||||
</span><span id="normalization_distance-54"><a href="#normalization_distance-54"><span class="linenos">54</span></a> <span class="k">return</span> <span class="nb">sum</span><span class="p">(</span><span class="n">_predicate_lengths</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="p">))</span> <span class="o">-</span> <span class="p">(</span>
|
||||
</span><span id="normalization_distance-55"><a href="#normalization_distance-55"><span class="linenos">55</span></a> <span class="nb">len</span><span class="p">(</span><span class="nb">list</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">)))</span> <span class="o">+</span> <span class="mi">1</span>
|
||||
</span><span id="normalization_distance-56"><a href="#normalization_distance-56"><span class="linenos">56</span></a> <span class="p">)</span>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="normalization_distance-70"><a href="#normalization_distance-70"><span class="linenos">70</span></a><span class="k">def</span> <span class="nf">normalization_distance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
|
||||
</span><span id="normalization_distance-71"><a href="#normalization_distance-71"><span class="linenos">71</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="normalization_distance-72"><a href="#normalization_distance-72"><span class="linenos">72</span></a><span class="sd"> The difference in the number of predicates between the current expression and the normalized form.</span>
|
||||
</span><span id="normalization_distance-73"><a href="#normalization_distance-73"><span class="linenos">73</span></a>
|
||||
</span><span id="normalization_distance-74"><a href="#normalization_distance-74"><span class="linenos">74</span></a><span class="sd"> This is used as an estimate of the cost of the conversion which is exponential in complexity.</span>
|
||||
</span><span id="normalization_distance-75"><a href="#normalization_distance-75"><span class="linenos">75</span></a>
|
||||
</span><span id="normalization_distance-76"><a href="#normalization_distance-76"><span class="linenos">76</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="normalization_distance-77"><a href="#normalization_distance-77"><span class="linenos">77</span></a><span class="sd"> >>> import sqlglot</span>
|
||||
</span><span id="normalization_distance-78"><a href="#normalization_distance-78"><span class="linenos">78</span></a><span class="sd"> >>> expression = sqlglot.parse_one("(a AND b) OR (c AND d)")</span>
|
||||
</span><span id="normalization_distance-79"><a href="#normalization_distance-79"><span class="linenos">79</span></a><span class="sd"> >>> normalization_distance(expression)</span>
|
||||
</span><span id="normalization_distance-80"><a href="#normalization_distance-80"><span class="linenos">80</span></a><span class="sd"> 4</span>
|
||||
</span><span id="normalization_distance-81"><a href="#normalization_distance-81"><span class="linenos">81</span></a>
|
||||
</span><span id="normalization_distance-82"><a href="#normalization_distance-82"><span class="linenos">82</span></a><span class="sd"> Args:</span>
|
||||
</span><span id="normalization_distance-83"><a href="#normalization_distance-83"><span class="linenos">83</span></a><span class="sd"> expression (sqlglot.Expression): expression to compute distance</span>
|
||||
</span><span id="normalization_distance-84"><a href="#normalization_distance-84"><span class="linenos">84</span></a><span class="sd"> dnf (bool): compute to dnf distance instead</span>
|
||||
</span><span id="normalization_distance-85"><a href="#normalization_distance-85"><span class="linenos">85</span></a><span class="sd"> Returns:</span>
|
||||
</span><span id="normalization_distance-86"><a href="#normalization_distance-86"><span class="linenos">86</span></a><span class="sd"> int: difference</span>
|
||||
</span><span id="normalization_distance-87"><a href="#normalization_distance-87"><span class="linenos">87</span></a><span class="sd"> """</span>
|
||||
</span><span id="normalization_distance-88"><a href="#normalization_distance-88"><span class="linenos">88</span></a> <span class="k">return</span> <span class="nb">sum</span><span class="p">(</span><span class="n">_predicate_lengths</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="p">))</span> <span class="o">-</span> <span class="p">(</span>
|
||||
</span><span id="normalization_distance-89"><a href="#normalization_distance-89"><span class="linenos">89</span></a> <span class="nb">sum</span><span class="p">(</span><span class="mi">1</span> <span class="k">for</span> <span class="n">_</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">))</span> <span class="o">+</span> <span class="mi">1</span>
|
||||
</span><span id="normalization_distance-90"><a href="#normalization_distance-90"><span class="linenos">90</span></a> <span class="p">)</span>
|
||||
</span></pre></div>
|
||||
|
||||
|
||||
|
|
@ -355,41 +415,44 @@
|
|||
<div class="attr function">
|
||||
|
||||
<span class="def">def</span>
|
||||
<span class="name">distributive_law</span><span class="signature pdoc-code condensed">(<span class="param"><span class="n">expression</span>, </span><span class="param"><span class="n">dnf</span>, </span><span class="param"><span class="n">max_distance</span></span><span class="return-annotation">):</span></span>
|
||||
<span class="name">distributive_law</span><span class="signature pdoc-code condensed">(<span class="param"><span class="n">expression</span>, </span><span class="param"><span class="n">dnf</span>, </span><span class="param"><span class="n">max_distance</span>, </span><span class="param"><span class="n">cache</span><span class="o">=</span><span class="kc">None</span></span><span class="return-annotation">):</span></span>
|
||||
|
||||
<label class="view-source-button" for="distributive_law-view-source"><span>View Source</span></label>
|
||||
|
||||
</div>
|
||||
<a class="headerlink" href="#distributive_law"></a>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="distributive_law-79"><a href="#distributive_law-79"><span class="linenos"> 79</span></a><span class="k">def</span> <span class="nf">distributive_law</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="p">,</span> <span class="n">max_distance</span><span class="p">):</span>
|
||||
</span><span id="distributive_law-80"><a href="#distributive_law-80"><span class="linenos"> 80</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="distributive_law-81"><a href="#distributive_law-81"><span class="linenos"> 81</span></a><span class="sd"> x OR (y AND z) -> (x OR y) AND (x OR z)</span>
|
||||
</span><span id="distributive_law-82"><a href="#distributive_law-82"><span class="linenos"> 82</span></a><span class="sd"> (x AND y) OR (y AND z) -> (x OR y) AND (x OR z) AND (y OR y) AND (y OR z)</span>
|
||||
</span><span id="distributive_law-83"><a href="#distributive_law-83"><span class="linenos"> 83</span></a><span class="sd"> """</span>
|
||||
</span><span id="distributive_law-84"><a href="#distributive_law-84"><span class="linenos"> 84</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">unnest</span><span class="p">(),</span> <span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">):</span>
|
||||
</span><span id="distributive_law-85"><a href="#distributive_law-85"><span class="linenos"> 85</span></a> <span class="k">if</span> <span class="n">normalization_distance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="p">)</span> <span class="o">></span> <span class="n">max_distance</span><span class="p">:</span>
|
||||
</span><span id="distributive_law-86"><a href="#distributive_law-86"><span class="linenos"> 86</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="distributive_law-87"><a href="#distributive_law-87"><span class="linenos"> 87</span></a>
|
||||
</span><span id="distributive_law-88"><a href="#distributive_law-88"><span class="linenos"> 88</span></a> <span class="n">to_exp</span><span class="p">,</span> <span class="n">from_exp</span> <span class="o">=</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Or</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span><span class="p">)</span> <span class="k">if</span> <span class="n">dnf</span> <span class="k">else</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">And</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Or</span><span class="p">)</span>
|
||||
</span><span id="distributive_law-89"><a href="#distributive_law-89"><span class="linenos"> 89</span></a>
|
||||
</span><span id="distributive_law-90"><a href="#distributive_law-90"><span class="linenos"> 90</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">replace_children</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="k">lambda</span> <span class="n">e</span><span class="p">:</span> <span class="n">distributive_law</span><span class="p">(</span><span class="n">e</span><span class="p">,</span> <span class="n">dnf</span><span class="p">,</span> <span class="n">max_distance</span><span class="p">))</span>
|
||||
</span><span id="distributive_law-91"><a href="#distributive_law-91"><span class="linenos"> 91</span></a>
|
||||
</span><span id="distributive_law-92"><a href="#distributive_law-92"><span class="linenos"> 92</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">from_exp</span><span class="p">):</span>
|
||||
</span><span id="distributive_law-93"><a href="#distributive_law-93"><span class="linenos"> 93</span></a> <span class="n">a</span><span class="p">,</span> <span class="n">b</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">unnest_operands</span><span class="p">()</span>
|
||||
</span><span id="distributive_law-94"><a href="#distributive_law-94"><span class="linenos"> 94</span></a>
|
||||
</span><span id="distributive_law-95"><a href="#distributive_law-95"><span class="linenos"> 95</span></a> <span class="n">from_func</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">and_</span> <span class="k">if</span> <span class="n">from_exp</span> <span class="o">==</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span> <span class="k">else</span> <span class="n">exp</span><span class="o">.</span><span class="n">or_</span>
|
||||
</span><span id="distributive_law-96"><a href="#distributive_law-96"><span class="linenos"> 96</span></a> <span class="n">to_func</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">and_</span> <span class="k">if</span> <span class="n">to_exp</span> <span class="o">==</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span> <span class="k">else</span> <span class="n">exp</span><span class="o">.</span><span class="n">or_</span>
|
||||
</span><span id="distributive_law-97"><a href="#distributive_law-97"><span class="linenos"> 97</span></a>
|
||||
</span><span id="distributive_law-98"><a href="#distributive_law-98"><span class="linenos"> 98</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">to_exp</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="n">to_exp</span><span class="p">):</span>
|
||||
</span><span id="distributive_law-99"><a href="#distributive_law-99"><span class="linenos"> 99</span></a> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="nb">tuple</span><span class="p">(</span><span class="n">a</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">)))</span> <span class="o">></span> <span class="nb">len</span><span class="p">(</span><span class="nb">tuple</span><span class="p">(</span><span class="n">b</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">))):</span>
|
||||
</span><span id="distributive_law-100"><a href="#distributive_law-100"><span class="linenos">100</span></a> <span class="k">return</span> <span class="n">_distribute</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">from_func</span><span class="p">,</span> <span class="n">to_func</span><span class="p">)</span>
|
||||
</span><span id="distributive_law-101"><a href="#distributive_law-101"><span class="linenos">101</span></a> <span class="k">return</span> <span class="n">_distribute</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="n">a</span><span class="p">,</span> <span class="n">from_func</span><span class="p">,</span> <span class="n">to_func</span><span class="p">)</span>
|
||||
</span><span id="distributive_law-102"><a href="#distributive_law-102"><span class="linenos">102</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">to_exp</span><span class="p">):</span>
|
||||
</span><span id="distributive_law-103"><a href="#distributive_law-103"><span class="linenos">103</span></a> <span class="k">return</span> <span class="n">_distribute</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="n">a</span><span class="p">,</span> <span class="n">from_func</span><span class="p">,</span> <span class="n">to_func</span><span class="p">)</span>
|
||||
</span><span id="distributive_law-104"><a href="#distributive_law-104"><span class="linenos">104</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="n">to_exp</span><span class="p">):</span>
|
||||
</span><span id="distributive_law-105"><a href="#distributive_law-105"><span class="linenos">105</span></a> <span class="k">return</span> <span class="n">_distribute</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">from_func</span><span class="p">,</span> <span class="n">to_func</span><span class="p">)</span>
|
||||
</span><span id="distributive_law-106"><a href="#distributive_law-106"><span class="linenos">106</span></a>
|
||||
</span><span id="distributive_law-107"><a href="#distributive_law-107"><span class="linenos">107</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="distributive_law-113"><a href="#distributive_law-113"><span class="linenos">113</span></a><span class="k">def</span> <span class="nf">distributive_law</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="p">,</span> <span class="n">max_distance</span><span class="p">,</span> <span class="n">cache</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
|
||||
</span><span id="distributive_law-114"><a href="#distributive_law-114"><span class="linenos">114</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="distributive_law-115"><a href="#distributive_law-115"><span class="linenos">115</span></a><span class="sd"> x OR (y AND z) -> (x OR y) AND (x OR z)</span>
|
||||
</span><span id="distributive_law-116"><a href="#distributive_law-116"><span class="linenos">116</span></a><span class="sd"> (x AND y) OR (y AND z) -> (x OR y) AND (x OR z) AND (y OR y) AND (y OR z)</span>
|
||||
</span><span id="distributive_law-117"><a href="#distributive_law-117"><span class="linenos">117</span></a><span class="sd"> """</span>
|
||||
</span><span id="distributive_law-118"><a href="#distributive_law-118"><span class="linenos">118</span></a> <span class="k">if</span> <span class="n">normalized</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="n">dnf</span><span class="p">):</span>
|
||||
</span><span id="distributive_law-119"><a href="#distributive_law-119"><span class="linenos">119</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="distributive_law-120"><a href="#distributive_law-120"><span class="linenos">120</span></a>
|
||||
</span><span id="distributive_law-121"><a href="#distributive_law-121"><span class="linenos">121</span></a> <span class="n">distance</span> <span class="o">=</span> <span class="n">normalization_distance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="n">dnf</span><span class="p">)</span>
|
||||
</span><span id="distributive_law-122"><a href="#distributive_law-122"><span class="linenos">122</span></a>
|
||||
</span><span id="distributive_law-123"><a href="#distributive_law-123"><span class="linenos">123</span></a> <span class="k">if</span> <span class="n">distance</span> <span class="o">></span> <span class="n">max_distance</span><span class="p">:</span>
|
||||
</span><span id="distributive_law-124"><a href="#distributive_law-124"><span class="linenos">124</span></a> <span class="k">raise</span> <span class="n">OptimizeError</span><span class="p">(</span><span class="sa">f</span><span class="s2">"Normalization distance </span><span class="si">{</span><span class="n">distance</span><span class="si">}</span><span class="s2"> exceeds max </span><span class="si">{</span><span class="n">max_distance</span><span class="si">}</span><span class="s2">"</span><span class="p">)</span>
|
||||
</span><span id="distributive_law-125"><a href="#distributive_law-125"><span class="linenos">125</span></a>
|
||||
</span><span id="distributive_law-126"><a href="#distributive_law-126"><span class="linenos">126</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">replace_children</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="k">lambda</span> <span class="n">e</span><span class="p">:</span> <span class="n">distributive_law</span><span class="p">(</span><span class="n">e</span><span class="p">,</span> <span class="n">dnf</span><span class="p">,</span> <span class="n">max_distance</span><span class="p">,</span> <span class="n">cache</span><span class="p">))</span>
|
||||
</span><span id="distributive_law-127"><a href="#distributive_law-127"><span class="linenos">127</span></a> <span class="n">to_exp</span><span class="p">,</span> <span class="n">from_exp</span> <span class="o">=</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Or</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span><span class="p">)</span> <span class="k">if</span> <span class="n">dnf</span> <span class="k">else</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">And</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Or</span><span class="p">)</span>
|
||||
</span><span id="distributive_law-128"><a href="#distributive_law-128"><span class="linenos">128</span></a>
|
||||
</span><span id="distributive_law-129"><a href="#distributive_law-129"><span class="linenos">129</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">from_exp</span><span class="p">):</span>
|
||||
</span><span id="distributive_law-130"><a href="#distributive_law-130"><span class="linenos">130</span></a> <span class="n">a</span><span class="p">,</span> <span class="n">b</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">unnest_operands</span><span class="p">()</span>
|
||||
</span><span id="distributive_law-131"><a href="#distributive_law-131"><span class="linenos">131</span></a>
|
||||
</span><span id="distributive_law-132"><a href="#distributive_law-132"><span class="linenos">132</span></a> <span class="n">from_func</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">and_</span> <span class="k">if</span> <span class="n">from_exp</span> <span class="o">==</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span> <span class="k">else</span> <span class="n">exp</span><span class="o">.</span><span class="n">or_</span>
|
||||
</span><span id="distributive_law-133"><a href="#distributive_law-133"><span class="linenos">133</span></a> <span class="n">to_func</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">and_</span> <span class="k">if</span> <span class="n">to_exp</span> <span class="o">==</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span> <span class="k">else</span> <span class="n">exp</span><span class="o">.</span><span class="n">or_</span>
|
||||
</span><span id="distributive_law-134"><a href="#distributive_law-134"><span class="linenos">134</span></a>
|
||||
</span><span id="distributive_law-135"><a href="#distributive_law-135"><span class="linenos">135</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">to_exp</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="n">to_exp</span><span class="p">):</span>
|
||||
</span><span id="distributive_law-136"><a href="#distributive_law-136"><span class="linenos">136</span></a> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="nb">tuple</span><span class="p">(</span><span class="n">a</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">)))</span> <span class="o">></span> <span class="nb">len</span><span class="p">(</span><span class="nb">tuple</span><span class="p">(</span><span class="n">b</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">))):</span>
|
||||
</span><span id="distributive_law-137"><a href="#distributive_law-137"><span class="linenos">137</span></a> <span class="k">return</span> <span class="n">_distribute</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">from_func</span><span class="p">,</span> <span class="n">to_func</span><span class="p">,</span> <span class="n">cache</span><span class="p">)</span>
|
||||
</span><span id="distributive_law-138"><a href="#distributive_law-138"><span class="linenos">138</span></a> <span class="k">return</span> <span class="n">_distribute</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="n">a</span><span class="p">,</span> <span class="n">from_func</span><span class="p">,</span> <span class="n">to_func</span><span class="p">,</span> <span class="n">cache</span><span class="p">)</span>
|
||||
</span><span id="distributive_law-139"><a href="#distributive_law-139"><span class="linenos">139</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">to_exp</span><span class="p">):</span>
|
||||
</span><span id="distributive_law-140"><a href="#distributive_law-140"><span class="linenos">140</span></a> <span class="k">return</span> <span class="n">_distribute</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="n">a</span><span class="p">,</span> <span class="n">from_func</span><span class="p">,</span> <span class="n">to_func</span><span class="p">,</span> <span class="n">cache</span><span class="p">)</span>
|
||||
</span><span id="distributive_law-141"><a href="#distributive_law-141"><span class="linenos">141</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="n">to_exp</span><span class="p">):</span>
|
||||
</span><span id="distributive_law-142"><a href="#distributive_law-142"><span class="linenos">142</span></a> <span class="k">return</span> <span class="n">_distribute</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">from_func</span><span class="p">,</span> <span class="n">to_func</span><span class="p">,</span> <span class="n">cache</span><span class="p">)</span>
|
||||
</span><span id="distributive_law-143"><a href="#distributive_law-143"><span class="linenos">143</span></a>
|
||||
</span><span id="distributive_law-144"><a href="#distributive_law-144"><span class="linenos">144</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span></pre></div>
|
||||
|
||||
|
||||
|
|
|
|||
|
|
@ -3,7 +3,7 @@
|
|||
<head>
|
||||
<meta charset="utf-8">
|
||||
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|
||||
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|
||||
<meta name="generator" content="pdoc 13.0.1"/>
|
||||
<title>sqlglot.optimizer.optimize_joins API documentation</title>
|
||||
|
||||
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|
||||
|
|
@ -28,8 +28,8 @@
|
|||
|
||||
|
||||
|
||||
<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
||||
<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
||||
<li>
|
||||
<a class="function" href="#optimize_joins">optimize_joins</a>
|
||||
</li>
|
||||
|
|
@ -67,84 +67,82 @@
|
|||
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="L-1"><a href="#L-1"><span class="linenos"> 1</span></a><span class="kn">from</span> <span class="nn">sqlglot</span> <span class="kn">import</span> <span class="n">exp</span>
|
||||
</span><span id="L-2"><a href="#L-2"><span class="linenos"> 2</span></a><span class="kn">from</span> <span class="nn">sqlglot.helper</span> <span class="kn">import</span> <span class="n">tsort</span>
|
||||
</span><span id="L-3"><a href="#L-3"><span class="linenos"> 3</span></a><span class="kn">from</span> <span class="nn">sqlglot.optimizer.simplify</span> <span class="kn">import</span> <span class="n">simplify</span>
|
||||
</span><span id="L-3"><a href="#L-3"><span class="linenos"> 3</span></a>
|
||||
</span><span id="L-4"><a href="#L-4"><span class="linenos"> 4</span></a>
|
||||
</span><span id="L-5"><a href="#L-5"><span class="linenos"> 5</span></a>
|
||||
</span><span id="L-6"><a href="#L-6"><span class="linenos"> 6</span></a><span class="k">def</span> <span class="nf">optimize_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="L-7"><a href="#L-7"><span class="linenos"> 7</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-8"><a href="#L-8"><span class="linenos"> 8</span></a><span class="sd"> Removes cross joins if possible and reorder joins based on predicate dependencies.</span>
|
||||
</span><span id="L-9"><a href="#L-9"><span class="linenos"> 9</span></a>
|
||||
</span><span id="L-10"><a href="#L-10"><span class="linenos">10</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="L-11"><a href="#L-11"><span class="linenos">11</span></a><span class="sd"> >>> from sqlglot import parse_one</span>
|
||||
</span><span id="L-12"><a href="#L-12"><span class="linenos">12</span></a><span class="sd"> >>> optimize_joins(parse_one("SELECT * FROM x CROSS JOIN y JOIN z ON x.a = z.a AND y.a = z.a")).sql()</span>
|
||||
</span><span id="L-13"><a href="#L-13"><span class="linenos">13</span></a><span class="sd"> 'SELECT * FROM x JOIN z ON x.a = z.a AND TRUE JOIN y ON y.a = z.a'</span>
|
||||
</span><span id="L-14"><a href="#L-14"><span class="linenos">14</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-15"><a href="#L-15"><span class="linenos">15</span></a> <span class="k">for</span> <span class="n">select</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">):</span>
|
||||
</span><span id="L-16"><a href="#L-16"><span class="linenos">16</span></a> <span class="n">references</span> <span class="o">=</span> <span class="p">{}</span>
|
||||
</span><span id="L-17"><a href="#L-17"><span class="linenos">17</span></a> <span class="n">cross_joins</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
</span><span id="L-18"><a href="#L-18"><span class="linenos">18</span></a>
|
||||
</span><span id="L-19"><a href="#L-19"><span class="linenos">19</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">select</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="p">[]):</span>
|
||||
</span><span id="L-20"><a href="#L-20"><span class="linenos">20</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="L-21"><a href="#L-21"><span class="linenos">21</span></a> <span class="n">tables</span> <span class="o">=</span> <span class="n">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span>
|
||||
</span><span id="L-22"><a href="#L-22"><span class="linenos">22</span></a>
|
||||
</span><span id="L-23"><a href="#L-23"><span class="linenos">23</span></a> <span class="k">if</span> <span class="n">tables</span><span class="p">:</span>
|
||||
</span><span id="L-24"><a href="#L-24"><span class="linenos">24</span></a> <span class="k">for</span> <span class="n">table</span> <span class="ow">in</span> <span class="n">tables</span><span class="p">:</span>
|
||||
</span><span id="L-25"><a href="#L-25"><span class="linenos">25</span></a> <span class="n">references</span><span class="p">[</span><span class="n">table</span><span class="p">]</span> <span class="o">=</span> <span class="n">references</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">table</span><span class="p">,</span> <span class="p">[])</span> <span class="o">+</span> <span class="p">[</span><span class="n">join</span><span class="p">]</span>
|
||||
</span><span id="L-26"><a href="#L-26"><span class="linenos">26</span></a> <span class="k">else</span><span class="p">:</span>
|
||||
</span><span id="L-27"><a href="#L-27"><span class="linenos">27</span></a> <span class="n">cross_joins</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">name</span><span class="p">,</span> <span class="n">join</span><span class="p">))</span>
|
||||
</span><span id="L-28"><a href="#L-28"><span class="linenos">28</span></a>
|
||||
</span><span id="L-29"><a href="#L-29"><span class="linenos">29</span></a> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">cross_joins</span><span class="p">:</span>
|
||||
</span><span id="L-30"><a href="#L-30"><span class="linenos">30</span></a> <span class="k">for</span> <span class="n">dep</span> <span class="ow">in</span> <span class="n">references</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="p">[]):</span>
|
||||
</span><span id="L-31"><a href="#L-31"><span class="linenos">31</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">dep</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"on"</span><span class="p">]</span>
|
||||
</span><span id="L-32"><a href="#L-32"><span class="linenos">32</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">on</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">simplify</span><span class="p">(</span><span class="n">on</span><span class="p">))</span>
|
||||
</span><span id="L-33"><a href="#L-33"><span class="linenos">33</span></a>
|
||||
</span><span id="L-34"><a href="#L-34"><span class="linenos">34</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">):</span>
|
||||
</span><span id="L-35"><a href="#L-35"><span class="linenos">35</span></a> <span class="k">for</span> <span class="n">predicate</span> <span class="ow">in</span> <span class="n">on</span><span class="o">.</span><span class="n">flatten</span><span class="p">():</span>
|
||||
</span><span id="L-36"><a href="#L-36"><span class="linenos">36</span></a> <span class="k">if</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">predicate</span><span class="p">):</span>
|
||||
</span><span id="L-37"><a href="#L-37"><span class="linenos">37</span></a> <span class="n">predicate</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
|
||||
</span><span id="L-38"><a href="#L-38"><span class="linenos">38</span></a> <span class="n">join</span><span class="o">.</span><span class="n">on</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
|
||||
</span><span id="L-39"><a href="#L-39"><span class="linenos">39</span></a>
|
||||
</span><span id="L-40"><a href="#L-40"><span class="linenos">40</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">reorder_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="L-41"><a href="#L-41"><span class="linenos">41</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">normalize</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="L-42"><a href="#L-42"><span class="linenos">42</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-43"><a href="#L-43"><span class="linenos">43</span></a>
|
||||
</span><span id="L-44"><a href="#L-44"><span class="linenos">44</span></a>
|
||||
</span><span id="L-45"><a href="#L-45"><span class="linenos">45</span></a><span class="k">def</span> <span class="nf">reorder_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="L-46"><a href="#L-46"><span class="linenos">46</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-47"><a href="#L-47"><span class="linenos">47</span></a><span class="sd"> Reorder joins by topological sort order based on predicate references.</span>
|
||||
</span><span id="L-48"><a href="#L-48"><span class="linenos">48</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-49"><a href="#L-49"><span class="linenos">49</span></a> <span class="k">for</span> <span class="n">from_</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">):</span>
|
||||
</span><span id="L-50"><a href="#L-50"><span class="linenos">50</span></a> <span class="n">head</span> <span class="o">=</span> <span class="n">from_</span><span class="o">.</span><span class="n">expressions</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
|
||||
</span><span id="L-51"><a href="#L-51"><span class="linenos">51</span></a> <span class="n">parent</span> <span class="o">=</span> <span class="n">from_</span><span class="o">.</span><span class="n">parent</span>
|
||||
</span><span id="L-52"><a href="#L-52"><span class="linenos">52</span></a> <span class="n">joins</span> <span class="o">=</span> <span class="p">{</span><span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span> <span class="n">join</span> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">parent</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="p">[])}</span>
|
||||
</span><span id="L-53"><a href="#L-53"><span class="linenos">53</span></a> <span class="n">dag</span> <span class="o">=</span> <span class="p">{</span><span class="n">head</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span> <span class="p">[]}</span>
|
||||
</span><span id="L-54"><a href="#L-54"><span class="linenos">54</span></a>
|
||||
</span><span id="L-55"><a href="#L-55"><span class="linenos">55</span></a> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">joins</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
|
||||
</span><span id="L-56"><a href="#L-56"><span class="linenos">56</span></a> <span class="n">dag</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span>
|
||||
</span><span id="L-57"><a href="#L-57"><span class="linenos">57</span></a>
|
||||
</span><span id="L-58"><a href="#L-58"><span class="linenos">58</span></a> <span class="n">parent</span><span class="o">.</span><span class="n">set</span><span class="p">(</span>
|
||||
</span><span id="L-59"><a href="#L-59"><span class="linenos">59</span></a> <span class="s2">"joins"</span><span class="p">,</span>
|
||||
</span><span id="L-60"><a href="#L-60"><span class="linenos">60</span></a> <span class="p">[</span><span class="n">joins</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">tsort</span><span class="p">(</span><span class="n">dag</span><span class="p">)</span> <span class="k">if</span> <span class="n">name</span> <span class="o">!=</span> <span class="n">head</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">],</span>
|
||||
</span><span id="L-61"><a href="#L-61"><span class="linenos">61</span></a> <span class="p">)</span>
|
||||
</span><span id="L-62"><a href="#L-62"><span class="linenos">62</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-63"><a href="#L-63"><span class="linenos">63</span></a>
|
||||
</span><span id="L-64"><a href="#L-64"><span class="linenos">64</span></a>
|
||||
</span><span id="L-65"><a href="#L-65"><span class="linenos">65</span></a><span class="k">def</span> <span class="nf">normalize</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="L-66"><a href="#L-66"><span class="linenos">66</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-67"><a href="#L-67"><span class="linenos">67</span></a><span class="sd"> Remove INNER and OUTER from joins as they are optional.</span>
|
||||
</span><span id="L-68"><a href="#L-68"><span class="linenos">68</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-69"><a href="#L-69"><span class="linenos">69</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span>
|
||||
</span><span id="L-70"><a href="#L-70"><span class="linenos">70</span></a> <span class="k">if</span> <span class="n">join</span><span class="o">.</span><span class="n">kind</span> <span class="o">!=</span> <span class="s2">"CROSS"</span><span class="p">:</span>
|
||||
</span><span id="L-71"><a href="#L-71"><span class="linenos">71</span></a> <span class="n">join</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"kind"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
|
||||
</span><span id="L-72"><a href="#L-72"><span class="linenos">72</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-73"><a href="#L-73"><span class="linenos">73</span></a>
|
||||
</span><span id="L-74"><a href="#L-74"><span class="linenos">74</span></a>
|
||||
</span><span id="L-75"><a href="#L-75"><span class="linenos">75</span></a><span class="k">def</span> <span class="nf">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">,</span> <span class="n">exclude</span><span class="p">):</span>
|
||||
</span><span id="L-76"><a href="#L-76"><span class="linenos">76</span></a> <span class="k">return</span> <span class="p">[</span>
|
||||
</span><span id="L-77"><a href="#L-77"><span class="linenos">77</span></a> <span class="n">name</span>
|
||||
</span><span id="L-78"><a href="#L-78"><span class="linenos">78</span></a> <span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)</span> <span class="ow">or</span> <span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">()))</span>
|
||||
</span><span id="L-79"><a href="#L-79"><span class="linenos">79</span></a> <span class="k">if</span> <span class="n">name</span> <span class="o">!=</span> <span class="n">exclude</span>
|
||||
</span><span id="L-80"><a href="#L-80"><span class="linenos">80</span></a> <span class="p">]</span>
|
||||
</span><span id="L-5"><a href="#L-5"><span class="linenos"> 5</span></a><span class="k">def</span> <span class="nf">optimize_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="L-6"><a href="#L-6"><span class="linenos"> 6</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-7"><a href="#L-7"><span class="linenos"> 7</span></a><span class="sd"> Removes cross joins if possible and reorder joins based on predicate dependencies.</span>
|
||||
</span><span id="L-8"><a href="#L-8"><span class="linenos"> 8</span></a>
|
||||
</span><span id="L-9"><a href="#L-9"><span class="linenos"> 9</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="L-10"><a href="#L-10"><span class="linenos">10</span></a><span class="sd"> >>> from sqlglot import parse_one</span>
|
||||
</span><span id="L-11"><a href="#L-11"><span class="linenos">11</span></a><span class="sd"> >>> optimize_joins(parse_one("SELECT * FROM x CROSS JOIN y JOIN z ON x.a = z.a AND y.a = z.a")).sql()</span>
|
||||
</span><span id="L-12"><a href="#L-12"><span class="linenos">12</span></a><span class="sd"> 'SELECT * FROM x JOIN z ON x.a = z.a AND TRUE JOIN y ON y.a = z.a'</span>
|
||||
</span><span id="L-13"><a href="#L-13"><span class="linenos">13</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-14"><a href="#L-14"><span class="linenos">14</span></a> <span class="k">for</span> <span class="n">select</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">):</span>
|
||||
</span><span id="L-15"><a href="#L-15"><span class="linenos">15</span></a> <span class="n">references</span> <span class="o">=</span> <span class="p">{}</span>
|
||||
</span><span id="L-16"><a href="#L-16"><span class="linenos">16</span></a> <span class="n">cross_joins</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
</span><span id="L-17"><a href="#L-17"><span class="linenos">17</span></a>
|
||||
</span><span id="L-18"><a href="#L-18"><span class="linenos">18</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">select</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="p">[]):</span>
|
||||
</span><span id="L-19"><a href="#L-19"><span class="linenos">19</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="L-20"><a href="#L-20"><span class="linenos">20</span></a> <span class="n">tables</span> <span class="o">=</span> <span class="n">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span>
|
||||
</span><span id="L-21"><a href="#L-21"><span class="linenos">21</span></a>
|
||||
</span><span id="L-22"><a href="#L-22"><span class="linenos">22</span></a> <span class="k">if</span> <span class="n">tables</span><span class="p">:</span>
|
||||
</span><span id="L-23"><a href="#L-23"><span class="linenos">23</span></a> <span class="k">for</span> <span class="n">table</span> <span class="ow">in</span> <span class="n">tables</span><span class="p">:</span>
|
||||
</span><span id="L-24"><a href="#L-24"><span class="linenos">24</span></a> <span class="n">references</span><span class="p">[</span><span class="n">table</span><span class="p">]</span> <span class="o">=</span> <span class="n">references</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">table</span><span class="p">,</span> <span class="p">[])</span> <span class="o">+</span> <span class="p">[</span><span class="n">join</span><span class="p">]</span>
|
||||
</span><span id="L-25"><a href="#L-25"><span class="linenos">25</span></a> <span class="k">else</span><span class="p">:</span>
|
||||
</span><span id="L-26"><a href="#L-26"><span class="linenos">26</span></a> <span class="n">cross_joins</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">name</span><span class="p">,</span> <span class="n">join</span><span class="p">))</span>
|
||||
</span><span id="L-27"><a href="#L-27"><span class="linenos">27</span></a>
|
||||
</span><span id="L-28"><a href="#L-28"><span class="linenos">28</span></a> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">cross_joins</span><span class="p">:</span>
|
||||
</span><span id="L-29"><a href="#L-29"><span class="linenos">29</span></a> <span class="k">for</span> <span class="n">dep</span> <span class="ow">in</span> <span class="n">references</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="p">[]):</span>
|
||||
</span><span id="L-30"><a href="#L-30"><span class="linenos">30</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">dep</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"on"</span><span class="p">]</span>
|
||||
</span><span id="L-31"><a href="#L-31"><span class="linenos">31</span></a>
|
||||
</span><span id="L-32"><a href="#L-32"><span class="linenos">32</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">):</span>
|
||||
</span><span id="L-33"><a href="#L-33"><span class="linenos">33</span></a> <span class="k">for</span> <span class="n">predicate</span> <span class="ow">in</span> <span class="n">on</span><span class="o">.</span><span class="n">flatten</span><span class="p">():</span>
|
||||
</span><span id="L-34"><a href="#L-34"><span class="linenos">34</span></a> <span class="k">if</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">predicate</span><span class="p">):</span>
|
||||
</span><span id="L-35"><a href="#L-35"><span class="linenos">35</span></a> <span class="n">predicate</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
|
||||
</span><span id="L-36"><a href="#L-36"><span class="linenos">36</span></a> <span class="n">join</span><span class="o">.</span><span class="n">on</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
|
||||
</span><span id="L-37"><a href="#L-37"><span class="linenos">37</span></a>
|
||||
</span><span id="L-38"><a href="#L-38"><span class="linenos">38</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">reorder_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="L-39"><a href="#L-39"><span class="linenos">39</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">normalize</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="L-40"><a href="#L-40"><span class="linenos">40</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-41"><a href="#L-41"><span class="linenos">41</span></a>
|
||||
</span><span id="L-42"><a href="#L-42"><span class="linenos">42</span></a>
|
||||
</span><span id="L-43"><a href="#L-43"><span class="linenos">43</span></a><span class="k">def</span> <span class="nf">reorder_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="L-44"><a href="#L-44"><span class="linenos">44</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-45"><a href="#L-45"><span class="linenos">45</span></a><span class="sd"> Reorder joins by topological sort order based on predicate references.</span>
|
||||
</span><span id="L-46"><a href="#L-46"><span class="linenos">46</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-47"><a href="#L-47"><span class="linenos">47</span></a> <span class="k">for</span> <span class="n">from_</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">):</span>
|
||||
</span><span id="L-48"><a href="#L-48"><span class="linenos">48</span></a> <span class="n">head</span> <span class="o">=</span> <span class="n">from_</span><span class="o">.</span><span class="n">expressions</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
|
||||
</span><span id="L-49"><a href="#L-49"><span class="linenos">49</span></a> <span class="n">parent</span> <span class="o">=</span> <span class="n">from_</span><span class="o">.</span><span class="n">parent</span>
|
||||
</span><span id="L-50"><a href="#L-50"><span class="linenos">50</span></a> <span class="n">joins</span> <span class="o">=</span> <span class="p">{</span><span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span> <span class="n">join</span> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">parent</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="p">[])}</span>
|
||||
</span><span id="L-51"><a href="#L-51"><span class="linenos">51</span></a> <span class="n">dag</span> <span class="o">=</span> <span class="p">{</span><span class="n">head</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span> <span class="p">[]}</span>
|
||||
</span><span id="L-52"><a href="#L-52"><span class="linenos">52</span></a>
|
||||
</span><span id="L-53"><a href="#L-53"><span class="linenos">53</span></a> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">joins</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
|
||||
</span><span id="L-54"><a href="#L-54"><span class="linenos">54</span></a> <span class="n">dag</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span>
|
||||
</span><span id="L-55"><a href="#L-55"><span class="linenos">55</span></a>
|
||||
</span><span id="L-56"><a href="#L-56"><span class="linenos">56</span></a> <span class="n">parent</span><span class="o">.</span><span class="n">set</span><span class="p">(</span>
|
||||
</span><span id="L-57"><a href="#L-57"><span class="linenos">57</span></a> <span class="s2">"joins"</span><span class="p">,</span>
|
||||
</span><span id="L-58"><a href="#L-58"><span class="linenos">58</span></a> <span class="p">[</span><span class="n">joins</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">tsort</span><span class="p">(</span><span class="n">dag</span><span class="p">)</span> <span class="k">if</span> <span class="n">name</span> <span class="o">!=</span> <span class="n">head</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">],</span>
|
||||
</span><span id="L-59"><a href="#L-59"><span class="linenos">59</span></a> <span class="p">)</span>
|
||||
</span><span id="L-60"><a href="#L-60"><span class="linenos">60</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-61"><a href="#L-61"><span class="linenos">61</span></a>
|
||||
</span><span id="L-62"><a href="#L-62"><span class="linenos">62</span></a>
|
||||
</span><span id="L-63"><a href="#L-63"><span class="linenos">63</span></a><span class="k">def</span> <span class="nf">normalize</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="L-64"><a href="#L-64"><span class="linenos">64</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="L-65"><a href="#L-65"><span class="linenos">65</span></a><span class="sd"> Remove INNER and OUTER from joins as they are optional.</span>
|
||||
</span><span id="L-66"><a href="#L-66"><span class="linenos">66</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-67"><a href="#L-67"><span class="linenos">67</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span>
|
||||
</span><span id="L-68"><a href="#L-68"><span class="linenos">68</span></a> <span class="k">if</span> <span class="n">join</span><span class="o">.</span><span class="n">kind</span> <span class="o">!=</span> <span class="s2">"CROSS"</span><span class="p">:</span>
|
||||
</span><span id="L-69"><a href="#L-69"><span class="linenos">69</span></a> <span class="n">join</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"kind"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
|
||||
</span><span id="L-70"><a href="#L-70"><span class="linenos">70</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span><span id="L-71"><a href="#L-71"><span class="linenos">71</span></a>
|
||||
</span><span id="L-72"><a href="#L-72"><span class="linenos">72</span></a>
|
||||
</span><span id="L-73"><a href="#L-73"><span class="linenos">73</span></a><span class="k">def</span> <span class="nf">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">,</span> <span class="n">exclude</span><span class="p">):</span>
|
||||
</span><span id="L-74"><a href="#L-74"><span class="linenos">74</span></a> <span class="k">return</span> <span class="p">[</span>
|
||||
</span><span id="L-75"><a href="#L-75"><span class="linenos">75</span></a> <span class="n">name</span>
|
||||
</span><span id="L-76"><a href="#L-76"><span class="linenos">76</span></a> <span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)</span> <span class="ow">or</span> <span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">()))</span>
|
||||
</span><span id="L-77"><a href="#L-77"><span class="linenos">77</span></a> <span class="k">if</span> <span class="n">name</span> <span class="o">!=</span> <span class="n">exclude</span>
|
||||
</span><span id="L-78"><a href="#L-78"><span class="linenos">78</span></a> <span class="p">]</span>
|
||||
</span></pre></div>
|
||||
|
||||
|
||||
|
|
@ -160,43 +158,42 @@
|
|||
|
||||
</div>
|
||||
<a class="headerlink" href="#optimize_joins"></a>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="optimize_joins-7"><a href="#optimize_joins-7"><span class="linenos"> 7</span></a><span class="k">def</span> <span class="nf">optimize_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="optimize_joins-8"><a href="#optimize_joins-8"><span class="linenos"> 8</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="optimize_joins-9"><a href="#optimize_joins-9"><span class="linenos"> 9</span></a><span class="sd"> Removes cross joins if possible and reorder joins based on predicate dependencies.</span>
|
||||
</span><span id="optimize_joins-10"><a href="#optimize_joins-10"><span class="linenos">10</span></a>
|
||||
</span><span id="optimize_joins-11"><a href="#optimize_joins-11"><span class="linenos">11</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="optimize_joins-12"><a href="#optimize_joins-12"><span class="linenos">12</span></a><span class="sd"> >>> from sqlglot import parse_one</span>
|
||||
</span><span id="optimize_joins-13"><a href="#optimize_joins-13"><span class="linenos">13</span></a><span class="sd"> >>> optimize_joins(parse_one("SELECT * FROM x CROSS JOIN y JOIN z ON x.a = z.a AND y.a = z.a")).sql()</span>
|
||||
</span><span id="optimize_joins-14"><a href="#optimize_joins-14"><span class="linenos">14</span></a><span class="sd"> 'SELECT * FROM x JOIN z ON x.a = z.a AND TRUE JOIN y ON y.a = z.a'</span>
|
||||
</span><span id="optimize_joins-15"><a href="#optimize_joins-15"><span class="linenos">15</span></a><span class="sd"> """</span>
|
||||
</span><span id="optimize_joins-16"><a href="#optimize_joins-16"><span class="linenos">16</span></a> <span class="k">for</span> <span class="n">select</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">):</span>
|
||||
</span><span id="optimize_joins-17"><a href="#optimize_joins-17"><span class="linenos">17</span></a> <span class="n">references</span> <span class="o">=</span> <span class="p">{}</span>
|
||||
</span><span id="optimize_joins-18"><a href="#optimize_joins-18"><span class="linenos">18</span></a> <span class="n">cross_joins</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
</span><span id="optimize_joins-19"><a href="#optimize_joins-19"><span class="linenos">19</span></a>
|
||||
</span><span id="optimize_joins-20"><a href="#optimize_joins-20"><span class="linenos">20</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">select</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="p">[]):</span>
|
||||
</span><span id="optimize_joins-21"><a href="#optimize_joins-21"><span class="linenos">21</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="optimize_joins-22"><a href="#optimize_joins-22"><span class="linenos">22</span></a> <span class="n">tables</span> <span class="o">=</span> <span class="n">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span>
|
||||
</span><span id="optimize_joins-23"><a href="#optimize_joins-23"><span class="linenos">23</span></a>
|
||||
</span><span id="optimize_joins-24"><a href="#optimize_joins-24"><span class="linenos">24</span></a> <span class="k">if</span> <span class="n">tables</span><span class="p">:</span>
|
||||
</span><span id="optimize_joins-25"><a href="#optimize_joins-25"><span class="linenos">25</span></a> <span class="k">for</span> <span class="n">table</span> <span class="ow">in</span> <span class="n">tables</span><span class="p">:</span>
|
||||
</span><span id="optimize_joins-26"><a href="#optimize_joins-26"><span class="linenos">26</span></a> <span class="n">references</span><span class="p">[</span><span class="n">table</span><span class="p">]</span> <span class="o">=</span> <span class="n">references</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">table</span><span class="p">,</span> <span class="p">[])</span> <span class="o">+</span> <span class="p">[</span><span class="n">join</span><span class="p">]</span>
|
||||
</span><span id="optimize_joins-27"><a href="#optimize_joins-27"><span class="linenos">27</span></a> <span class="k">else</span><span class="p">:</span>
|
||||
</span><span id="optimize_joins-28"><a href="#optimize_joins-28"><span class="linenos">28</span></a> <span class="n">cross_joins</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">name</span><span class="p">,</span> <span class="n">join</span><span class="p">))</span>
|
||||
</span><span id="optimize_joins-29"><a href="#optimize_joins-29"><span class="linenos">29</span></a>
|
||||
</span><span id="optimize_joins-30"><a href="#optimize_joins-30"><span class="linenos">30</span></a> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">cross_joins</span><span class="p">:</span>
|
||||
</span><span id="optimize_joins-31"><a href="#optimize_joins-31"><span class="linenos">31</span></a> <span class="k">for</span> <span class="n">dep</span> <span class="ow">in</span> <span class="n">references</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="p">[]):</span>
|
||||
</span><span id="optimize_joins-32"><a href="#optimize_joins-32"><span class="linenos">32</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">dep</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"on"</span><span class="p">]</span>
|
||||
</span><span id="optimize_joins-33"><a href="#optimize_joins-33"><span class="linenos">33</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">on</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">simplify</span><span class="p">(</span><span class="n">on</span><span class="p">))</span>
|
||||
</span><span id="optimize_joins-34"><a href="#optimize_joins-34"><span class="linenos">34</span></a>
|
||||
</span><span id="optimize_joins-35"><a href="#optimize_joins-35"><span class="linenos">35</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">):</span>
|
||||
</span><span id="optimize_joins-36"><a href="#optimize_joins-36"><span class="linenos">36</span></a> <span class="k">for</span> <span class="n">predicate</span> <span class="ow">in</span> <span class="n">on</span><span class="o">.</span><span class="n">flatten</span><span class="p">():</span>
|
||||
</span><span id="optimize_joins-37"><a href="#optimize_joins-37"><span class="linenos">37</span></a> <span class="k">if</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">predicate</span><span class="p">):</span>
|
||||
</span><span id="optimize_joins-38"><a href="#optimize_joins-38"><span class="linenos">38</span></a> <span class="n">predicate</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
|
||||
</span><span id="optimize_joins-39"><a href="#optimize_joins-39"><span class="linenos">39</span></a> <span class="n">join</span><span class="o">.</span><span class="n">on</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
|
||||
</span><span id="optimize_joins-40"><a href="#optimize_joins-40"><span class="linenos">40</span></a>
|
||||
</span><span id="optimize_joins-41"><a href="#optimize_joins-41"><span class="linenos">41</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">reorder_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="optimize_joins-42"><a href="#optimize_joins-42"><span class="linenos">42</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">normalize</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="optimize_joins-43"><a href="#optimize_joins-43"><span class="linenos">43</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="optimize_joins-6"><a href="#optimize_joins-6"><span class="linenos"> 6</span></a><span class="k">def</span> <span class="nf">optimize_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="optimize_joins-7"><a href="#optimize_joins-7"><span class="linenos"> 7</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="optimize_joins-8"><a href="#optimize_joins-8"><span class="linenos"> 8</span></a><span class="sd"> Removes cross joins if possible and reorder joins based on predicate dependencies.</span>
|
||||
</span><span id="optimize_joins-9"><a href="#optimize_joins-9"><span class="linenos"> 9</span></a>
|
||||
</span><span id="optimize_joins-10"><a href="#optimize_joins-10"><span class="linenos">10</span></a><span class="sd"> Example:</span>
|
||||
</span><span id="optimize_joins-11"><a href="#optimize_joins-11"><span class="linenos">11</span></a><span class="sd"> >>> from sqlglot import parse_one</span>
|
||||
</span><span id="optimize_joins-12"><a href="#optimize_joins-12"><span class="linenos">12</span></a><span class="sd"> >>> optimize_joins(parse_one("SELECT * FROM x CROSS JOIN y JOIN z ON x.a = z.a AND y.a = z.a")).sql()</span>
|
||||
</span><span id="optimize_joins-13"><a href="#optimize_joins-13"><span class="linenos">13</span></a><span class="sd"> 'SELECT * FROM x JOIN z ON x.a = z.a AND TRUE JOIN y ON y.a = z.a'</span>
|
||||
</span><span id="optimize_joins-14"><a href="#optimize_joins-14"><span class="linenos">14</span></a><span class="sd"> """</span>
|
||||
</span><span id="optimize_joins-15"><a href="#optimize_joins-15"><span class="linenos">15</span></a> <span class="k">for</span> <span class="n">select</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">):</span>
|
||||
</span><span id="optimize_joins-16"><a href="#optimize_joins-16"><span class="linenos">16</span></a> <span class="n">references</span> <span class="o">=</span> <span class="p">{}</span>
|
||||
</span><span id="optimize_joins-17"><a href="#optimize_joins-17"><span class="linenos">17</span></a> <span class="n">cross_joins</span> <span class="o">=</span> <span class="p">[]</span>
|
||||
</span><span id="optimize_joins-18"><a href="#optimize_joins-18"><span class="linenos">18</span></a>
|
||||
</span><span id="optimize_joins-19"><a href="#optimize_joins-19"><span class="linenos">19</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">select</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="p">[]):</span>
|
||||
</span><span id="optimize_joins-20"><a href="#optimize_joins-20"><span class="linenos">20</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">alias_or_name</span>
|
||||
</span><span id="optimize_joins-21"><a href="#optimize_joins-21"><span class="linenos">21</span></a> <span class="n">tables</span> <span class="o">=</span> <span class="n">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span>
|
||||
</span><span id="optimize_joins-22"><a href="#optimize_joins-22"><span class="linenos">22</span></a>
|
||||
</span><span id="optimize_joins-23"><a href="#optimize_joins-23"><span class="linenos">23</span></a> <span class="k">if</span> <span class="n">tables</span><span class="p">:</span>
|
||||
</span><span id="optimize_joins-24"><a href="#optimize_joins-24"><span class="linenos">24</span></a> <span class="k">for</span> <span class="n">table</span> <span class="ow">in</span> <span class="n">tables</span><span class="p">:</span>
|
||||
</span><span id="optimize_joins-25"><a href="#optimize_joins-25"><span class="linenos">25</span></a> <span class="n">references</span><span class="p">[</span><span class="n">table</span><span class="p">]</span> <span class="o">=</span> <span class="n">references</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">table</span><span class="p">,</span> <span class="p">[])</span> <span class="o">+</span> <span class="p">[</span><span class="n">join</span><span class="p">]</span>
|
||||
</span><span id="optimize_joins-26"><a href="#optimize_joins-26"><span class="linenos">26</span></a> <span class="k">else</span><span class="p">:</span>
|
||||
</span><span id="optimize_joins-27"><a href="#optimize_joins-27"><span class="linenos">27</span></a> <span class="n">cross_joins</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">name</span><span class="p">,</span> <span class="n">join</span><span class="p">))</span>
|
||||
</span><span id="optimize_joins-28"><a href="#optimize_joins-28"><span class="linenos">28</span></a>
|
||||
</span><span id="optimize_joins-29"><a href="#optimize_joins-29"><span class="linenos">29</span></a> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">cross_joins</span><span class="p">:</span>
|
||||
</span><span id="optimize_joins-30"><a href="#optimize_joins-30"><span class="linenos">30</span></a> <span class="k">for</span> <span class="n">dep</span> <span class="ow">in</span> <span class="n">references</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="p">[]):</span>
|
||||
</span><span id="optimize_joins-31"><a href="#optimize_joins-31"><span class="linenos">31</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">dep</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"on"</span><span class="p">]</span>
|
||||
</span><span id="optimize_joins-32"><a href="#optimize_joins-32"><span class="linenos">32</span></a>
|
||||
</span><span id="optimize_joins-33"><a href="#optimize_joins-33"><span class="linenos">33</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">):</span>
|
||||
</span><span id="optimize_joins-34"><a href="#optimize_joins-34"><span class="linenos">34</span></a> <span class="k">for</span> <span class="n">predicate</span> <span class="ow">in</span> <span class="n">on</span><span class="o">.</span><span class="n">flatten</span><span class="p">():</span>
|
||||
</span><span id="optimize_joins-35"><a href="#optimize_joins-35"><span class="linenos">35</span></a> <span class="k">if</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">predicate</span><span class="p">):</span>
|
||||
</span><span id="optimize_joins-36"><a href="#optimize_joins-36"><span class="linenos">36</span></a> <span class="n">predicate</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
|
||||
</span><span id="optimize_joins-37"><a href="#optimize_joins-37"><span class="linenos">37</span></a> <span class="n">join</span><span class="o">.</span><span class="n">on</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
|
||||
</span><span id="optimize_joins-38"><a href="#optimize_joins-38"><span class="linenos">38</span></a>
|
||||
</span><span id="optimize_joins-39"><a href="#optimize_joins-39"><span class="linenos">39</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">reorder_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="optimize_joins-40"><a href="#optimize_joins-40"><span class="linenos">40</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">normalize</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
||||
</span><span id="optimize_joins-41"><a href="#optimize_joins-41"><span class="linenos">41</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span></pre></div>
|
||||
|
||||
|
||||
|
|
@ -227,24 +224,24 @@
|
|||
|
||||
</div>
|
||||
<a class="headerlink" href="#reorder_joins"></a>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="reorder_joins-46"><a href="#reorder_joins-46"><span class="linenos">46</span></a><span class="k">def</span> <span class="nf">reorder_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="reorder_joins-47"><a href="#reorder_joins-47"><span class="linenos">47</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="reorder_joins-48"><a href="#reorder_joins-48"><span class="linenos">48</span></a><span class="sd"> Reorder joins by topological sort order based on predicate references.</span>
|
||||
</span><span id="reorder_joins-49"><a href="#reorder_joins-49"><span class="linenos">49</span></a><span class="sd"> """</span>
|
||||
</span><span id="reorder_joins-50"><a href="#reorder_joins-50"><span class="linenos">50</span></a> <span class="k">for</span> <span class="n">from_</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">):</span>
|
||||
</span><span id="reorder_joins-51"><a href="#reorder_joins-51"><span class="linenos">51</span></a> <span class="n">head</span> <span class="o">=</span> <span class="n">from_</span><span class="o">.</span><span class="n">expressions</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
|
||||
</span><span id="reorder_joins-52"><a href="#reorder_joins-52"><span class="linenos">52</span></a> <span class="n">parent</span> <span class="o">=</span> <span class="n">from_</span><span class="o">.</span><span class="n">parent</span>
|
||||
</span><span id="reorder_joins-53"><a href="#reorder_joins-53"><span class="linenos">53</span></a> <span class="n">joins</span> <span class="o">=</span> <span class="p">{</span><span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span> <span class="n">join</span> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">parent</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="p">[])}</span>
|
||||
</span><span id="reorder_joins-54"><a href="#reorder_joins-54"><span class="linenos">54</span></a> <span class="n">dag</span> <span class="o">=</span> <span class="p">{</span><span class="n">head</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span> <span class="p">[]}</span>
|
||||
</span><span id="reorder_joins-55"><a href="#reorder_joins-55"><span class="linenos">55</span></a>
|
||||
</span><span id="reorder_joins-56"><a href="#reorder_joins-56"><span class="linenos">56</span></a> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">joins</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
|
||||
</span><span id="reorder_joins-57"><a href="#reorder_joins-57"><span class="linenos">57</span></a> <span class="n">dag</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span>
|
||||
</span><span id="reorder_joins-58"><a href="#reorder_joins-58"><span class="linenos">58</span></a>
|
||||
</span><span id="reorder_joins-59"><a href="#reorder_joins-59"><span class="linenos">59</span></a> <span class="n">parent</span><span class="o">.</span><span class="n">set</span><span class="p">(</span>
|
||||
</span><span id="reorder_joins-60"><a href="#reorder_joins-60"><span class="linenos">60</span></a> <span class="s2">"joins"</span><span class="p">,</span>
|
||||
</span><span id="reorder_joins-61"><a href="#reorder_joins-61"><span class="linenos">61</span></a> <span class="p">[</span><span class="n">joins</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">tsort</span><span class="p">(</span><span class="n">dag</span><span class="p">)</span> <span class="k">if</span> <span class="n">name</span> <span class="o">!=</span> <span class="n">head</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">],</span>
|
||||
</span><span id="reorder_joins-62"><a href="#reorder_joins-62"><span class="linenos">62</span></a> <span class="p">)</span>
|
||||
</span><span id="reorder_joins-63"><a href="#reorder_joins-63"><span class="linenos">63</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="reorder_joins-44"><a href="#reorder_joins-44"><span class="linenos">44</span></a><span class="k">def</span> <span class="nf">reorder_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="reorder_joins-45"><a href="#reorder_joins-45"><span class="linenos">45</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="reorder_joins-46"><a href="#reorder_joins-46"><span class="linenos">46</span></a><span class="sd"> Reorder joins by topological sort order based on predicate references.</span>
|
||||
</span><span id="reorder_joins-47"><a href="#reorder_joins-47"><span class="linenos">47</span></a><span class="sd"> """</span>
|
||||
</span><span id="reorder_joins-48"><a href="#reorder_joins-48"><span class="linenos">48</span></a> <span class="k">for</span> <span class="n">from_</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">):</span>
|
||||
</span><span id="reorder_joins-49"><a href="#reorder_joins-49"><span class="linenos">49</span></a> <span class="n">head</span> <span class="o">=</span> <span class="n">from_</span><span class="o">.</span><span class="n">expressions</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
|
||||
</span><span id="reorder_joins-50"><a href="#reorder_joins-50"><span class="linenos">50</span></a> <span class="n">parent</span> <span class="o">=</span> <span class="n">from_</span><span class="o">.</span><span class="n">parent</span>
|
||||
</span><span id="reorder_joins-51"><a href="#reorder_joins-51"><span class="linenos">51</span></a> <span class="n">joins</span> <span class="o">=</span> <span class="p">{</span><span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span> <span class="n">join</span> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">parent</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="p">[])}</span>
|
||||
</span><span id="reorder_joins-52"><a href="#reorder_joins-52"><span class="linenos">52</span></a> <span class="n">dag</span> <span class="o">=</span> <span class="p">{</span><span class="n">head</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span> <span class="p">[]}</span>
|
||||
</span><span id="reorder_joins-53"><a href="#reorder_joins-53"><span class="linenos">53</span></a>
|
||||
</span><span id="reorder_joins-54"><a href="#reorder_joins-54"><span class="linenos">54</span></a> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">joins</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
|
||||
</span><span id="reorder_joins-55"><a href="#reorder_joins-55"><span class="linenos">55</span></a> <span class="n">dag</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span>
|
||||
</span><span id="reorder_joins-56"><a href="#reorder_joins-56"><span class="linenos">56</span></a>
|
||||
</span><span id="reorder_joins-57"><a href="#reorder_joins-57"><span class="linenos">57</span></a> <span class="n">parent</span><span class="o">.</span><span class="n">set</span><span class="p">(</span>
|
||||
</span><span id="reorder_joins-58"><a href="#reorder_joins-58"><span class="linenos">58</span></a> <span class="s2">"joins"</span><span class="p">,</span>
|
||||
</span><span id="reorder_joins-59"><a href="#reorder_joins-59"><span class="linenos">59</span></a> <span class="p">[</span><span class="n">joins</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">tsort</span><span class="p">(</span><span class="n">dag</span><span class="p">)</span> <span class="k">if</span> <span class="n">name</span> <span class="o">!=</span> <span class="n">head</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">],</span>
|
||||
</span><span id="reorder_joins-60"><a href="#reorder_joins-60"><span class="linenos">60</span></a> <span class="p">)</span>
|
||||
</span><span id="reorder_joins-61"><a href="#reorder_joins-61"><span class="linenos">61</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span></pre></div>
|
||||
|
||||
|
||||
|
|
@ -264,14 +261,14 @@
|
|||
|
||||
</div>
|
||||
<a class="headerlink" href="#normalize"></a>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="normalize-66"><a href="#normalize-66"><span class="linenos">66</span></a><span class="k">def</span> <span class="nf">normalize</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="normalize-67"><a href="#normalize-67"><span class="linenos">67</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="normalize-68"><a href="#normalize-68"><span class="linenos">68</span></a><span class="sd"> Remove INNER and OUTER from joins as they are optional.</span>
|
||||
</span><span id="normalize-69"><a href="#normalize-69"><span class="linenos">69</span></a><span class="sd"> """</span>
|
||||
</span><span id="normalize-70"><a href="#normalize-70"><span class="linenos">70</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span>
|
||||
</span><span id="normalize-71"><a href="#normalize-71"><span class="linenos">71</span></a> <span class="k">if</span> <span class="n">join</span><span class="o">.</span><span class="n">kind</span> <span class="o">!=</span> <span class="s2">"CROSS"</span><span class="p">:</span>
|
||||
</span><span id="normalize-72"><a href="#normalize-72"><span class="linenos">72</span></a> <span class="n">join</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"kind"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
|
||||
</span><span id="normalize-73"><a href="#normalize-73"><span class="linenos">73</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="normalize-64"><a href="#normalize-64"><span class="linenos">64</span></a><span class="k">def</span> <span class="nf">normalize</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
||||
</span><span id="normalize-65"><a href="#normalize-65"><span class="linenos">65</span></a><span class="w"> </span><span class="sd">"""</span>
|
||||
</span><span id="normalize-66"><a href="#normalize-66"><span class="linenos">66</span></a><span class="sd"> Remove INNER and OUTER from joins as they are optional.</span>
|
||||
</span><span id="normalize-67"><a href="#normalize-67"><span class="linenos">67</span></a><span class="sd"> """</span>
|
||||
</span><span id="normalize-68"><a href="#normalize-68"><span class="linenos">68</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span>
|
||||
</span><span id="normalize-69"><a href="#normalize-69"><span class="linenos">69</span></a> <span class="k">if</span> <span class="n">join</span><span class="o">.</span><span class="n">kind</span> <span class="o">!=</span> <span class="s2">"CROSS"</span><span class="p">:</span>
|
||||
</span><span id="normalize-70"><a href="#normalize-70"><span class="linenos">70</span></a> <span class="n">join</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"kind"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
|
||||
</span><span id="normalize-71"><a href="#normalize-71"><span class="linenos">71</span></a> <span class="k">return</span> <span class="n">expression</span>
|
||||
</span></pre></div>
|
||||
|
||||
|
||||
|
|
@ -291,12 +288,12 @@
|
|||
|
||||
</div>
|
||||
<a class="headerlink" href="#other_table_names"></a>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="other_table_names-76"><a href="#other_table_names-76"><span class="linenos">76</span></a><span class="k">def</span> <span class="nf">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">,</span> <span class="n">exclude</span><span class="p">):</span>
|
||||
</span><span id="other_table_names-77"><a href="#other_table_names-77"><span class="linenos">77</span></a> <span class="k">return</span> <span class="p">[</span>
|
||||
</span><span id="other_table_names-78"><a href="#other_table_names-78"><span class="linenos">78</span></a> <span class="n">name</span>
|
||||
</span><span id="other_table_names-79"><a href="#other_table_names-79"><span class="linenos">79</span></a> <span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)</span> <span class="ow">or</span> <span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">()))</span>
|
||||
</span><span id="other_table_names-80"><a href="#other_table_names-80"><span class="linenos">80</span></a> <span class="k">if</span> <span class="n">name</span> <span class="o">!=</span> <span class="n">exclude</span>
|
||||
</span><span id="other_table_names-81"><a href="#other_table_names-81"><span class="linenos">81</span></a> <span class="p">]</span>
|
||||
<div class="pdoc-code codehilite"><pre><span></span><span id="other_table_names-74"><a href="#other_table_names-74"><span class="linenos">74</span></a><span class="k">def</span> <span class="nf">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">,</span> <span class="n">exclude</span><span class="p">):</span>
|
||||
</span><span id="other_table_names-75"><a href="#other_table_names-75"><span class="linenos">75</span></a> <span class="k">return</span> <span class="p">[</span>
|
||||
</span><span id="other_table_names-76"><a href="#other_table_names-76"><span class="linenos">76</span></a> <span class="n">name</span>
|
||||
</span><span id="other_table_names-77"><a href="#other_table_names-77"><span class="linenos">77</span></a> <span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)</span> <span class="ow">or</span> <span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">()))</span>
|
||||
</span><span id="other_table_names-78"><a href="#other_table_names-78"><span class="linenos">78</span></a> <span class="k">if</span> <span class="n">name</span> <span class="o">!=</span> <span class="n">exclude</span>
|
||||
</span><span id="other_table_names-79"><a href="#other_table_names-79"><span class="linenos">79</span></a> <span class="p">]</span>
|
||||
</span></pre></div>
|
||||
|
||||
|
||||
|
|
|
|||
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|
|
@ -3,7 +3,7 @@
|
|||
<head>
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|
||||
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|
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<meta name="generator" content="pdoc 13.0.0"/>
|
||||
<meta name="generator" content="pdoc 13.0.1"/>
|
||||
<title>sqlglot.optimizer.pushdown_predicates API documentation</title>
|
||||
|
||||
<style>/*! * Bootstrap Reboot v5.0.0 (https://getbootstrap.com/) * Copyright 2011-2021 The Bootstrap Authors * Copyright 2011-2021 Twitter, Inc. * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE) * Forked from Normalize.css, licensed MIT (https://github.com/necolas/normalize.css/blob/master/LICENSE.md) */*,::after,::before{box-sizing:border-box}@media (prefers-reduced-motion:no-preference){:root{scroll-behavior:smooth}}body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans","Liberation Sans",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";font-size:1rem;font-weight:400;line-height:1.5;color:#212529;background-color:#fff;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:transparent}hr{margin:1rem 0;color:inherit;background-color:currentColor;border:0;opacity:.25}hr:not([size]){height:1px}h1,h2,h3,h4,h5,h6{margin-top:0;margin-bottom:.5rem;font-weight:500;line-height:1.2}h1{font-size:calc(1.375rem + 1.5vw)}@media (min-width:1200px){h1{font-size:2.5rem}}h2{font-size:calc(1.325rem + .9vw)}@media (min-width:1200px){h2{font-size:2rem}}h3{font-size:calc(1.3rem + .6vw)}@media (min-width:1200px){h3{font-size:1.75rem}}h4{font-size:calc(1.275rem + .3vw)}@media (min-width:1200px){h4{font-size:1.5rem}}h5{font-size:1.25rem}h6{font-size:1rem}p{margin-top:0;margin-bottom:1rem}abbr[data-bs-original-title],abbr[title]{-webkit-text-decoration:underline dotted;text-decoration:underline dotted;cursor:help;-webkit-text-decoration-skip-ink:none;text-decoration-skip-ink:none}address{margin-bottom:1rem;font-style:normal;line-height:inherit}ol,ul{padding-left:2rem}dl,ol,ul{margin-top:0;margin-bottom:1rem}ol ol,ol ul,ul ol,ul ul{margin-bottom:0}dt{font-weight:700}dd{margin-bottom:.5rem;margin-left:0}blockquote{margin:0 0 1rem}b,strong{font-weight:bolder}small{font-size:.875em}mark{padding:.2em;background-color:#fcf8e3}sub,sup{position:relative;font-size:.75em;line-height:0;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}a{color:#0d6efd;text-decoration:underline}a:hover{color:#0a58ca}a:not([href]):not([class]),a:not([href]):not([class]):hover{color:inherit;text-decoration:none}code,kbd,pre,samp{font-family:SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;font-size:1em;direction:ltr;unicode-bidi:bidi-override}pre{display:block;margin-top:0;margin-bottom:1rem;overflow:auto;font-size:.875em}pre code{font-size:inherit;color:inherit;word-break:normal}code{font-size:.875em;color:#d63384;word-wrap:break-word}a>code{color:inherit}kbd{padding:.2rem .4rem;font-size:.875em;color:#fff;background-color:#212529;border-radius:.2rem}kbd kbd{padding:0;font-size:1em;font-weight:700}figure{margin:0 0 1rem}img,svg{vertical-align:middle}table{caption-side:bottom;border-collapse:collapse}caption{padding-top:.5rem;padding-bottom:.5rem;color:#6c757d;text-align:left}th{text-align:inherit;text-align:-webkit-match-parent}tbody,td,tfoot,th,thead,tr{border-color:inherit;border-style:solid;border-width:0}label{display:inline-block}button{border-radius:0}button:focus:not(:focus-visible){outline:0}button,input,optgroup,select,textarea{margin:0;font-family:inherit;font-size:inherit;line-height:inherit}button,select{text-transform:none}[role=button]{cursor:pointer}select{word-wrap:normal}select:disabled{opacity:1}[list]::-webkit-calendar-picker-indicator{display:none}[type=button],[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]:not(:disabled),[type=reset]:not(:disabled),[type=submit]:not(:disabled),button:not(:disabled){cursor:pointer}::-moz-focus-inner{padding:0;border-style:none}textarea{resize:vertical}fieldset{min-width:0;padding:0;margin:0;border:0}legend{float:left;width:100%;padding:0;margin-bottom:.5rem;font-size:calc(1.275rem + .3vw);line-height:inherit}@media (min-width:1200px){legend{font-size:1.5rem}}legend+*{clear:left}::-webkit-datetime-edit-day-field,::-webkit-datetime-edit-fields-wrapper,::-webkit-datetime-edit-hour-field,::-webkit-datetime-edit-minute,::-webkit-datetime-edit-month-field,::-webkit-datetime-edit-text,::-webkit-datetime-edit-year-field{padding:0}::-webkit-inner-spin-button{height:auto}[type=search]{outline-offset:-2px;-webkit-appearance:textfield}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-color-swatch-wrapper{padding:0}::file-selector-button{font:inherit}::-webkit-file-upload-button{font:inherit;-webkit-appearance:button}output{display:inline-block}iframe{border:0}summary{display:list-item;cursor:pointer}progress{vertical-align:baseline}[hidden]{display:none!important}</style>
|
||||
|
|
@ -28,8 +28,8 @@
|
|||
|
||||
|
||||
|
||||
<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
||||
<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
||||
<li>
|
||||
<a class="function" href="#pushdown_predicates">pushdown_predicates</a>
|
||||
</li>
|
||||
|
|
|
|||
|
|
@ -3,7 +3,7 @@
|
|||
<head>
|
||||
<meta charset="utf-8">
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1">
|
||||
<meta name="generator" content="pdoc 13.0.0"/>
|
||||
<meta name="generator" content="pdoc 13.0.1"/>
|
||||
<title>sqlglot.optimizer.pushdown_projections API documentation</title>
|
||||
|
||||
<style>/*! * Bootstrap Reboot v5.0.0 (https://getbootstrap.com/) * Copyright 2011-2021 The Bootstrap Authors * Copyright 2011-2021 Twitter, Inc. * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE) * Forked from Normalize.css, licensed MIT (https://github.com/necolas/normalize.css/blob/master/LICENSE.md) */*,::after,::before{box-sizing:border-box}@media (prefers-reduced-motion:no-preference){:root{scroll-behavior:smooth}}body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans","Liberation Sans",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";font-size:1rem;font-weight:400;line-height:1.5;color:#212529;background-color:#fff;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:transparent}hr{margin:1rem 0;color:inherit;background-color:currentColor;border:0;opacity:.25}hr:not([size]){height:1px}h1,h2,h3,h4,h5,h6{margin-top:0;margin-bottom:.5rem;font-weight:500;line-height:1.2}h1{font-size:calc(1.375rem + 1.5vw)}@media (min-width:1200px){h1{font-size:2.5rem}}h2{font-size:calc(1.325rem + .9vw)}@media (min-width:1200px){h2{font-size:2rem}}h3{font-size:calc(1.3rem + .6vw)}@media (min-width:1200px){h3{font-size:1.75rem}}h4{font-size:calc(1.275rem + .3vw)}@media (min-width:1200px){h4{font-size:1.5rem}}h5{font-size:1.25rem}h6{font-size:1rem}p{margin-top:0;margin-bottom:1rem}abbr[data-bs-original-title],abbr[title]{-webkit-text-decoration:underline dotted;text-decoration:underline dotted;cursor:help;-webkit-text-decoration-skip-ink:none;text-decoration-skip-ink:none}address{margin-bottom:1rem;font-style:normal;line-height:inherit}ol,ul{padding-left:2rem}dl,ol,ul{margin-top:0;margin-bottom:1rem}ol ol,ol ul,ul ol,ul ul{margin-bottom:0}dt{font-weight:700}dd{margin-bottom:.5rem;margin-left:0}blockquote{margin:0 0 1rem}b,strong{font-weight:bolder}small{font-size:.875em}mark{padding:.2em;background-color:#fcf8e3}sub,sup{position:relative;font-size:.75em;line-height:0;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}a{color:#0d6efd;text-decoration:underline}a:hover{color:#0a58ca}a:not([href]):not([class]),a:not([href]):not([class]):hover{color:inherit;text-decoration:none}code,kbd,pre,samp{font-family:SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;font-size:1em;direction:ltr;unicode-bidi:bidi-override}pre{display:block;margin-top:0;margin-bottom:1rem;overflow:auto;font-size:.875em}pre code{font-size:inherit;color:inherit;word-break:normal}code{font-size:.875em;color:#d63384;word-wrap:break-word}a>code{color:inherit}kbd{padding:.2rem .4rem;font-size:.875em;color:#fff;background-color:#212529;border-radius:.2rem}kbd kbd{padding:0;font-size:1em;font-weight:700}figure{margin:0 0 1rem}img,svg{vertical-align:middle}table{caption-side:bottom;border-collapse:collapse}caption{padding-top:.5rem;padding-bottom:.5rem;color:#6c757d;text-align:left}th{text-align:inherit;text-align:-webkit-match-parent}tbody,td,tfoot,th,thead,tr{border-color:inherit;border-style:solid;border-width:0}label{display:inline-block}button{border-radius:0}button:focus:not(:focus-visible){outline:0}button,input,optgroup,select,textarea{margin:0;font-family:inherit;font-size:inherit;line-height:inherit}button,select{text-transform:none}[role=button]{cursor:pointer}select{word-wrap:normal}select:disabled{opacity:1}[list]::-webkit-calendar-picker-indicator{display:none}[type=button],[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]:not(:disabled),[type=reset]:not(:disabled),[type=submit]:not(:disabled),button:not(:disabled){cursor:pointer}::-moz-focus-inner{padding:0;border-style:none}textarea{resize:vertical}fieldset{min-width:0;padding:0;margin:0;border:0}legend{float:left;width:100%;padding:0;margin-bottom:.5rem;font-size:calc(1.275rem + .3vw);line-height:inherit}@media (min-width:1200px){legend{font-size:1.5rem}}legend+*{clear:left}::-webkit-datetime-edit-day-field,::-webkit-datetime-edit-fields-wrapper,::-webkit-datetime-edit-hour-field,::-webkit-datetime-edit-minute,::-webkit-datetime-edit-month-field,::-webkit-datetime-edit-text,::-webkit-datetime-edit-year-field{padding:0}::-webkit-inner-spin-button{height:auto}[type=search]{outline-offset:-2px;-webkit-appearance:textfield}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-color-swatch-wrapper{padding:0}::file-selector-button{font:inherit}::-webkit-file-upload-button{font:inherit;-webkit-appearance:button}output{display:inline-block}iframe{border:0}summary{display:list-item;cursor:pointer}progress{vertical-align:baseline}[hidden]{display:none!important}</style>
|
||||
|
|
@ -28,8 +28,8 @@
|
|||
|
||||
|
||||
|
||||
<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
||||
<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
||||
<li>
|
||||
<a class="function" href="#DEFAULT_SELECTION">DEFAULT_SELECTION</a>
|
||||
</li>
|
||||
|
|
|
|||
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|
|
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|
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<meta name="generator" content="pdoc 13.0.1"/>
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<title>sqlglot.optimizer.qualify_tables API documentation</title>
|
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|
||||
<style>/*! * Bootstrap Reboot v5.0.0 (https://getbootstrap.com/) * Copyright 2011-2021 The Bootstrap Authors * Copyright 2011-2021 Twitter, Inc. * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE) * Forked from Normalize.css, licensed MIT (https://github.com/necolas/normalize.css/blob/master/LICENSE.md) */*,::after,::before{box-sizing:border-box}@media (prefers-reduced-motion:no-preference){:root{scroll-behavior:smooth}}body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans","Liberation Sans",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";font-size:1rem;font-weight:400;line-height:1.5;color:#212529;background-color:#fff;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:transparent}hr{margin:1rem 0;color:inherit;background-color:currentColor;border:0;opacity:.25}hr:not([size]){height:1px}h1,h2,h3,h4,h5,h6{margin-top:0;margin-bottom:.5rem;font-weight:500;line-height:1.2}h1{font-size:calc(1.375rem + 1.5vw)}@media (min-width:1200px){h1{font-size:2.5rem}}h2{font-size:calc(1.325rem + .9vw)}@media (min-width:1200px){h2{font-size:2rem}}h3{font-size:calc(1.3rem + .6vw)}@media (min-width:1200px){h3{font-size:1.75rem}}h4{font-size:calc(1.275rem + .3vw)}@media (min-width:1200px){h4{font-size:1.5rem}}h5{font-size:1.25rem}h6{font-size:1rem}p{margin-top:0;margin-bottom:1rem}abbr[data-bs-original-title],abbr[title]{-webkit-text-decoration:underline dotted;text-decoration:underline dotted;cursor:help;-webkit-text-decoration-skip-ink:none;text-decoration-skip-ink:none}address{margin-bottom:1rem;font-style:normal;line-height:inherit}ol,ul{padding-left:2rem}dl,ol,ul{margin-top:0;margin-bottom:1rem}ol ol,ol ul,ul ol,ul ul{margin-bottom:0}dt{font-weight:700}dd{margin-bottom:.5rem;margin-left:0}blockquote{margin:0 0 1rem}b,strong{font-weight:bolder}small{font-size:.875em}mark{padding:.2em;background-color:#fcf8e3}sub,sup{position:relative;font-size:.75em;line-height:0;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}a{color:#0d6efd;text-decoration:underline}a:hover{color:#0a58ca}a:not([href]):not([class]),a:not([href]):not([class]):hover{color:inherit;text-decoration:none}code,kbd,pre,samp{font-family:SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;font-size:1em;direction:ltr;unicode-bidi:bidi-override}pre{display:block;margin-top:0;margin-bottom:1rem;overflow:auto;font-size:.875em}pre code{font-size:inherit;color:inherit;word-break:normal}code{font-size:.875em;color:#d63384;word-wrap:break-word}a>code{color:inherit}kbd{padding:.2rem .4rem;font-size:.875em;color:#fff;background-color:#212529;border-radius:.2rem}kbd kbd{padding:0;font-size:1em;font-weight:700}figure{margin:0 0 1rem}img,svg{vertical-align:middle}table{caption-side:bottom;border-collapse:collapse}caption{padding-top:.5rem;padding-bottom:.5rem;color:#6c757d;text-align:left}th{text-align:inherit;text-align:-webkit-match-parent}tbody,td,tfoot,th,thead,tr{border-color:inherit;border-style:solid;border-width:0}label{display:inline-block}button{border-radius:0}button:focus:not(:focus-visible){outline:0}button,input,optgroup,select,textarea{margin:0;font-family:inherit;font-size:inherit;line-height:inherit}button,select{text-transform:none}[role=button]{cursor:pointer}select{word-wrap:normal}select:disabled{opacity:1}[list]::-webkit-calendar-picker-indicator{display:none}[type=button],[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]:not(:disabled),[type=reset]:not(:disabled),[type=submit]:not(:disabled),button:not(:disabled){cursor:pointer}::-moz-focus-inner{padding:0;border-style:none}textarea{resize:vertical}fieldset{min-width:0;padding:0;margin:0;border:0}legend{float:left;width:100%;padding:0;margin-bottom:.5rem;font-size:calc(1.275rem + .3vw);line-height:inherit}@media (min-width:1200px){legend{font-size:1.5rem}}legend+*{clear:left}::-webkit-datetime-edit-day-field,::-webkit-datetime-edit-fields-wrapper,::-webkit-datetime-edit-hour-field,::-webkit-datetime-edit-minute,::-webkit-datetime-edit-month-field,::-webkit-datetime-edit-text,::-webkit-datetime-edit-year-field{padding:0}::-webkit-inner-spin-button{height:auto}[type=search]{outline-offset:-2px;-webkit-appearance:textfield}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-color-swatch-wrapper{padding:0}::file-selector-button{font:inherit}::-webkit-file-upload-button{font:inherit;-webkit-appearance:button}output{display:inline-block}iframe{border:0}summary{display:list-item;cursor:pointer}progress{vertical-align:baseline}[hidden]{display:none!important}</style>
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@ -28,8 +28,8 @@
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||||
|
||||
|
||||
<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
||||
<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
||||
<li>
|
||||
<a class="function" href="#qualify_tables">qualify_tables</a>
|
||||
</li>
|
||||
|
|
|
|||
|
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@ -3,7 +3,7 @@
|
|||
<head>
|
||||
<meta charset="utf-8">
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1">
|
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<meta name="generator" content="pdoc 13.0.0"/>
|
||||
<meta name="generator" content="pdoc 13.0.1"/>
|
||||
<title>sqlglot.optimizer.scope API documentation</title>
|
||||
|
||||
<style>/*! * Bootstrap Reboot v5.0.0 (https://getbootstrap.com/) * Copyright 2011-2021 The Bootstrap Authors * Copyright 2011-2021 Twitter, Inc. * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE) * Forked from Normalize.css, licensed MIT (https://github.com/necolas/normalize.css/blob/master/LICENSE.md) */*,::after,::before{box-sizing:border-box}@media (prefers-reduced-motion:no-preference){:root{scroll-behavior:smooth}}body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans","Liberation Sans",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";font-size:1rem;font-weight:400;line-height:1.5;color:#212529;background-color:#fff;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:transparent}hr{margin:1rem 0;color:inherit;background-color:currentColor;border:0;opacity:.25}hr:not([size]){height:1px}h1,h2,h3,h4,h5,h6{margin-top:0;margin-bottom:.5rem;font-weight:500;line-height:1.2}h1{font-size:calc(1.375rem + 1.5vw)}@media (min-width:1200px){h1{font-size:2.5rem}}h2{font-size:calc(1.325rem + .9vw)}@media (min-width:1200px){h2{font-size:2rem}}h3{font-size:calc(1.3rem + .6vw)}@media (min-width:1200px){h3{font-size:1.75rem}}h4{font-size:calc(1.275rem + .3vw)}@media (min-width:1200px){h4{font-size:1.5rem}}h5{font-size:1.25rem}h6{font-size:1rem}p{margin-top:0;margin-bottom:1rem}abbr[data-bs-original-title],abbr[title]{-webkit-text-decoration:underline dotted;text-decoration:underline dotted;cursor:help;-webkit-text-decoration-skip-ink:none;text-decoration-skip-ink:none}address{margin-bottom:1rem;font-style:normal;line-height:inherit}ol,ul{padding-left:2rem}dl,ol,ul{margin-top:0;margin-bottom:1rem}ol ol,ol ul,ul ol,ul ul{margin-bottom:0}dt{font-weight:700}dd{margin-bottom:.5rem;margin-left:0}blockquote{margin:0 0 1rem}b,strong{font-weight:bolder}small{font-size:.875em}mark{padding:.2em;background-color:#fcf8e3}sub,sup{position:relative;font-size:.75em;line-height:0;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}a{color:#0d6efd;text-decoration:underline}a:hover{color:#0a58ca}a:not([href]):not([class]),a:not([href]):not([class]):hover{color:inherit;text-decoration:none}code,kbd,pre,samp{font-family:SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;font-size:1em;direction:ltr;unicode-bidi:bidi-override}pre{display:block;margin-top:0;margin-bottom:1rem;overflow:auto;font-size:.875em}pre code{font-size:inherit;color:inherit;word-break:normal}code{font-size:.875em;color:#d63384;word-wrap:break-word}a>code{color:inherit}kbd{padding:.2rem .4rem;font-size:.875em;color:#fff;background-color:#212529;border-radius:.2rem}kbd kbd{padding:0;font-size:1em;font-weight:700}figure{margin:0 0 1rem}img,svg{vertical-align:middle}table{caption-side:bottom;border-collapse:collapse}caption{padding-top:.5rem;padding-bottom:.5rem;color:#6c757d;text-align:left}th{text-align:inherit;text-align:-webkit-match-parent}tbody,td,tfoot,th,thead,tr{border-color:inherit;border-style:solid;border-width:0}label{display:inline-block}button{border-radius:0}button:focus:not(:focus-visible){outline:0}button,input,optgroup,select,textarea{margin:0;font-family:inherit;font-size:inherit;line-height:inherit}button,select{text-transform:none}[role=button]{cursor:pointer}select{word-wrap:normal}select:disabled{opacity:1}[list]::-webkit-calendar-picker-indicator{display:none}[type=button],[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]:not(:disabled),[type=reset]:not(:disabled),[type=submit]:not(:disabled),button:not(:disabled){cursor:pointer}::-moz-focus-inner{padding:0;border-style:none}textarea{resize:vertical}fieldset{min-width:0;padding:0;margin:0;border:0}legend{float:left;width:100%;padding:0;margin-bottom:.5rem;font-size:calc(1.275rem + .3vw);line-height:inherit}@media (min-width:1200px){legend{font-size:1.5rem}}legend+*{clear:left}::-webkit-datetime-edit-day-field,::-webkit-datetime-edit-fields-wrapper,::-webkit-datetime-edit-hour-field,::-webkit-datetime-edit-minute,::-webkit-datetime-edit-month-field,::-webkit-datetime-edit-text,::-webkit-datetime-edit-year-field{padding:0}::-webkit-inner-spin-button{height:auto}[type=search]{outline-offset:-2px;-webkit-appearance:textfield}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-color-swatch-wrapper{padding:0}::file-selector-button{font:inherit}::-webkit-file-upload-button{font:inherit;-webkit-appearance:button}output{display:inline-block}iframe{border:0}summary{display:list-item;cursor:pointer}progress{vertical-align:baseline}[hidden]{display:none!important}</style>
|
||||
|
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@ -28,8 +28,8 @@
|
|||
|
||||
|
||||
|
||||
<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
||||
<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
||||
<li>
|
||||
<a class="class" href="#ScopeType">ScopeType</a>
|
||||
<ul class="memberlist">
|
||||
|
|
@ -350,7 +350,7 @@
|
|||
</span><span id="L-160"><a href="#L-160"><span class="linenos">160</span></a><span class="sd"> Yields:</span>
|
||||
</span><span id="L-161"><a href="#L-161"><span class="linenos">161</span></a><span class="sd"> exp.Expression: nodes</span>
|
||||
</span><span id="L-162"><a href="#L-162"><span class="linenos">162</span></a><span class="sd"> """</span>
|
||||
</span><span id="L-163"><a href="#L-163"><span class="linenos">163</span></a> <span class="k">for</span> <span class="n">expression</span><span class="p">,</span> <span class="n">_</span><span class="p">,</span> <span class="n">_</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">walk</span><span class="p">(</span><span class="n">bfs</span><span class="o">=</span><span class="n">bfs</span><span class="p">):</span>
|
||||
</span><span id="L-163"><a href="#L-163"><span class="linenos">163</span></a> <span class="k">for</span> <span class="n">expression</span><span class="p">,</span> <span class="o">*</span><span class="n">_</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">walk</span><span class="p">(</span><span class="n">bfs</span><span class="o">=</span><span class="n">bfs</span><span class="p">):</span>
|
||||
</span><span id="L-164"><a href="#L-164"><span class="linenos">164</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">expression_types</span><span class="p">):</span>
|
||||
</span><span id="L-165"><a href="#L-165"><span class="linenos">165</span></a> <span class="k">yield</span> <span class="n">expression</span>
|
||||
</span><span id="L-166"><a href="#L-166"><span class="linenos">166</span></a>
|
||||
|
|
@ -1133,7 +1133,7 @@
|
|||
</span><span id="Scope-161"><a href="#Scope-161"><span class="linenos">161</span></a><span class="sd"> Yields:</span>
|
||||
</span><span id="Scope-162"><a href="#Scope-162"><span class="linenos">162</span></a><span class="sd"> exp.Expression: nodes</span>
|
||||
</span><span id="Scope-163"><a href="#Scope-163"><span class="linenos">163</span></a><span class="sd"> """</span>
|
||||
</span><span id="Scope-164"><a href="#Scope-164"><span class="linenos">164</span></a> <span class="k">for</span> <span class="n">expression</span><span class="p">,</span> <span class="n">_</span><span class="p">,</span> <span class="n">_</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">walk</span><span class="p">(</span><span class="n">bfs</span><span class="o">=</span><span class="n">bfs</span><span class="p">):</span>
|
||||
</span><span id="Scope-164"><a href="#Scope-164"><span class="linenos">164</span></a> <span class="k">for</span> <span class="n">expression</span><span class="p">,</span> <span class="o">*</span><span class="n">_</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">walk</span><span class="p">(</span><span class="n">bfs</span><span class="o">=</span><span class="n">bfs</span><span class="p">):</span>
|
||||
</span><span id="Scope-165"><a href="#Scope-165"><span class="linenos">165</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">expression_types</span><span class="p">):</span>
|
||||
</span><span id="Scope-166"><a href="#Scope-166"><span class="linenos">166</span></a> <span class="k">yield</span> <span class="n">expression</span>
|
||||
</span><span id="Scope-167"><a href="#Scope-167"><span class="linenos">167</span></a>
|
||||
|
|
@ -1660,7 +1660,7 @@ a list of the left and right child scopes.</li>
|
|||
</span><span id="Scope.find_all-161"><a href="#Scope.find_all-161"><span class="linenos">161</span></a><span class="sd"> Yields:</span>
|
||||
</span><span id="Scope.find_all-162"><a href="#Scope.find_all-162"><span class="linenos">162</span></a><span class="sd"> exp.Expression: nodes</span>
|
||||
</span><span id="Scope.find_all-163"><a href="#Scope.find_all-163"><span class="linenos">163</span></a><span class="sd"> """</span>
|
||||
</span><span id="Scope.find_all-164"><a href="#Scope.find_all-164"><span class="linenos">164</span></a> <span class="k">for</span> <span class="n">expression</span><span class="p">,</span> <span class="n">_</span><span class="p">,</span> <span class="n">_</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">walk</span><span class="p">(</span><span class="n">bfs</span><span class="o">=</span><span class="n">bfs</span><span class="p">):</span>
|
||||
</span><span id="Scope.find_all-164"><a href="#Scope.find_all-164"><span class="linenos">164</span></a> <span class="k">for</span> <span class="n">expression</span><span class="p">,</span> <span class="o">*</span><span class="n">_</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">walk</span><span class="p">(</span><span class="n">bfs</span><span class="o">=</span><span class="n">bfs</span><span class="p">):</span>
|
||||
</span><span id="Scope.find_all-165"><a href="#Scope.find_all-165"><span class="linenos">165</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">expression_types</span><span class="p">):</span>
|
||||
</span><span id="Scope.find_all-166"><a href="#Scope.find_all-166"><span class="linenos">166</span></a> <span class="k">yield</span> <span class="n">expression</span>
|
||||
</span></pre></div>
|
||||
|
|
|
|||
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|
@ -3,7 +3,7 @@
|
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<head>
|
||||
<meta charset="utf-8">
|
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<meta name="viewport" content="width=device-width, initial-scale=1">
|
||||
<meta name="generator" content="pdoc 13.0.0"/>
|
||||
<meta name="generator" content="pdoc 13.0.1"/>
|
||||
<title>sqlglot.optimizer.unnest_subqueries API documentation</title>
|
||||
|
||||
<style>/*! * Bootstrap Reboot v5.0.0 (https://getbootstrap.com/) * Copyright 2011-2021 The Bootstrap Authors * Copyright 2011-2021 Twitter, Inc. * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE) * Forked from Normalize.css, licensed MIT (https://github.com/necolas/normalize.css/blob/master/LICENSE.md) */*,::after,::before{box-sizing:border-box}@media (prefers-reduced-motion:no-preference){:root{scroll-behavior:smooth}}body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans","Liberation Sans",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";font-size:1rem;font-weight:400;line-height:1.5;color:#212529;background-color:#fff;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:transparent}hr{margin:1rem 0;color:inherit;background-color:currentColor;border:0;opacity:.25}hr:not([size]){height:1px}h1,h2,h3,h4,h5,h6{margin-top:0;margin-bottom:.5rem;font-weight:500;line-height:1.2}h1{font-size:calc(1.375rem + 1.5vw)}@media (min-width:1200px){h1{font-size:2.5rem}}h2{font-size:calc(1.325rem + .9vw)}@media (min-width:1200px){h2{font-size:2rem}}h3{font-size:calc(1.3rem + .6vw)}@media (min-width:1200px){h3{font-size:1.75rem}}h4{font-size:calc(1.275rem + .3vw)}@media (min-width:1200px){h4{font-size:1.5rem}}h5{font-size:1.25rem}h6{font-size:1rem}p{margin-top:0;margin-bottom:1rem}abbr[data-bs-original-title],abbr[title]{-webkit-text-decoration:underline dotted;text-decoration:underline dotted;cursor:help;-webkit-text-decoration-skip-ink:none;text-decoration-skip-ink:none}address{margin-bottom:1rem;font-style:normal;line-height:inherit}ol,ul{padding-left:2rem}dl,ol,ul{margin-top:0;margin-bottom:1rem}ol ol,ol ul,ul ol,ul ul{margin-bottom:0}dt{font-weight:700}dd{margin-bottom:.5rem;margin-left:0}blockquote{margin:0 0 1rem}b,strong{font-weight:bolder}small{font-size:.875em}mark{padding:.2em;background-color:#fcf8e3}sub,sup{position:relative;font-size:.75em;line-height:0;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}a{color:#0d6efd;text-decoration:underline}a:hover{color:#0a58ca}a:not([href]):not([class]),a:not([href]):not([class]):hover{color:inherit;text-decoration:none}code,kbd,pre,samp{font-family:SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;font-size:1em;direction:ltr;unicode-bidi:bidi-override}pre{display:block;margin-top:0;margin-bottom:1rem;overflow:auto;font-size:.875em}pre code{font-size:inherit;color:inherit;word-break:normal}code{font-size:.875em;color:#d63384;word-wrap:break-word}a>code{color:inherit}kbd{padding:.2rem .4rem;font-size:.875em;color:#fff;background-color:#212529;border-radius:.2rem}kbd kbd{padding:0;font-size:1em;font-weight:700}figure{margin:0 0 1rem}img,svg{vertical-align:middle}table{caption-side:bottom;border-collapse:collapse}caption{padding-top:.5rem;padding-bottom:.5rem;color:#6c757d;text-align:left}th{text-align:inherit;text-align:-webkit-match-parent}tbody,td,tfoot,th,thead,tr{border-color:inherit;border-style:solid;border-width:0}label{display:inline-block}button{border-radius:0}button:focus:not(:focus-visible){outline:0}button,input,optgroup,select,textarea{margin:0;font-family:inherit;font-size:inherit;line-height:inherit}button,select{text-transform:none}[role=button]{cursor:pointer}select{word-wrap:normal}select:disabled{opacity:1}[list]::-webkit-calendar-picker-indicator{display:none}[type=button],[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]:not(:disabled),[type=reset]:not(:disabled),[type=submit]:not(:disabled),button:not(:disabled){cursor:pointer}::-moz-focus-inner{padding:0;border-style:none}textarea{resize:vertical}fieldset{min-width:0;padding:0;margin:0;border:0}legend{float:left;width:100%;padding:0;margin-bottom:.5rem;font-size:calc(1.275rem + .3vw);line-height:inherit}@media (min-width:1200px){legend{font-size:1.5rem}}legend+*{clear:left}::-webkit-datetime-edit-day-field,::-webkit-datetime-edit-fields-wrapper,::-webkit-datetime-edit-hour-field,::-webkit-datetime-edit-minute,::-webkit-datetime-edit-month-field,::-webkit-datetime-edit-text,::-webkit-datetime-edit-year-field{padding:0}::-webkit-inner-spin-button{height:auto}[type=search]{outline-offset:-2px;-webkit-appearance:textfield}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-color-swatch-wrapper{padding:0}::file-selector-button{font:inherit}::-webkit-file-upload-button{font:inherit;-webkit-appearance:button}output{display:inline-block}iframe{border:0}summary{display:list-item;cursor:pointer}progress{vertical-align:baseline}[hidden]{display:none!important}</style>
|
||||
|
|
@ -28,8 +28,8 @@
|
|||
|
||||
|
||||
|
||||
<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
||||
<h2>API Documentation</h2>
|
||||
<ul class="memberlist">
|
||||
<li>
|
||||
<a class="function" href="#unnest_subqueries">unnest_subqueries</a>
|
||||
</li>
|
||||
|
|
|
|||
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Add table
Add a link
Reference in a new issue