Merging upstream version 26.1.3.
Signed-off-by: Daniel Baumann <daniel@debian.org>
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119 changed files with 71635 additions and 68059 deletions
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<title>sqlglot.optimizer.pushdown_projections API documentation</title>
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<label class="view-source-button" for="mod-pushdown_projections-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">collections</span> <span class="kn">import</span> <span class="n">defaultdict</span>
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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="w"> </span><span class="nn">collections</span><span class="w"> </span><span class="kn">import</span> <span class="n">defaultdict</span>
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</span><span id="L-2"><a href="#L-2"><span class="linenos"> 2</span></a>
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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</span> <span class="kn">import</span> <span class="n">alias</span><span class="p">,</span> <span class="n">exp</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.qualify_columns</span> <span class="kn">import</span> <span class="n">Resolver</span>
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</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>
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</span><span id="L-6"><a href="#L-6"><span class="linenos"> 6</span></a><span class="kn">from</span> <span class="nn">sqlglot.schema</span> <span class="kn">import</span> <span class="n">ensure_schema</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="w"> </span><span class="nn">sqlglot</span><span class="w"> </span><span class="kn">import</span> <span class="n">alias</span><span class="p">,</span> <span class="n">exp</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="w"> </span><span class="nn">sqlglot.optimizer.qualify_columns</span><span class="w"> </span><span class="kn">import</span> <span class="n">Resolver</span>
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</span><span id="L-5"><a href="#L-5"><span class="linenos"> 5</span></a><span class="kn">from</span><span class="w"> </span><span class="nn">sqlglot.optimizer.scope</span><span class="w"> </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-6"><a href="#L-6"><span class="linenos"> 6</span></a><span class="kn">from</span><span class="w"> </span><span class="nn">sqlglot.schema</span><span class="w"> </span><span class="kn">import</span> <span class="n">ensure_schema</span>
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</span><span id="L-7"><a href="#L-7"><span class="linenos"> 7</span></a>
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</span><span id="L-8"><a href="#L-8"><span class="linenos"> 8</span></a><span class="c1"># Sentinel value that means an outer query selecting ALL columns</span>
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</span><span id="L-9"><a href="#L-9"><span class="linenos"> 9</span></a><span class="n">SELECT_ALL</span> <span class="o">=</span> <span class="nb">object</span><span class="p">()</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>
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</span><span id="L-12"><a href="#L-12"><span class="linenos"> 12</span></a><span class="c1"># Selection to use if selection list is empty</span>
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</span><span id="L-13"><a href="#L-13"><span class="linenos"> 13</span></a><span class="k">def</span> <span class="nf">default_selection</span><span class="p">(</span><span class="n">is_agg</span><span class="p">:</span> <span class="nb">bool</span><span class="p">)</span> <span class="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Alias</span><span class="p">:</span>
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</span><span id="L-13"><a href="#L-13"><span class="linenos"> 13</span></a><span class="k">def</span><span class="w"> </span><span class="nf">default_selection</span><span class="p">(</span><span class="n">is_agg</span><span class="p">:</span> <span class="nb">bool</span><span class="p">)</span> <span class="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Alias</span><span class="p">:</span>
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</span><span id="L-14"><a href="#L-14"><span class="linenos"> 14</span></a> <span class="k">return</span> <span class="n">alias</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Max</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">Literal</span><span class="o">.</span><span class="n">number</span><span class="p">(</span><span class="mi">1</span><span class="p">))</span> <span class="k">if</span> <span class="n">is_agg</span> <span class="k">else</span> <span class="s2">"1"</span><span class="p">,</span> <span class="s2">"_"</span><span class="p">)</span>
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</span><span id="L-15"><a href="#L-15"><span class="linenos"> 15</span></a>
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</span><span id="L-16"><a href="#L-16"><span class="linenos"> 16</span></a>
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</span><span id="L-17"><a href="#L-17"><span class="linenos"> 17</span></a><span class="k">def</span> <span class="nf">pushdown_projections</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">schema</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">remove_unused_selections</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
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</span><span id="L-17"><a href="#L-17"><span class="linenos"> 17</span></a><span class="k">def</span><span class="w"> </span><span class="nf">pushdown_projections</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">schema</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">remove_unused_selections</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
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</span><span id="L-18"><a href="#L-18"><span class="linenos"> 18</span></a><span class="w"> </span><span class="sd">"""</span>
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</span><span id="L-19"><a href="#L-19"><span class="linenos"> 19</span></a><span class="sd"> Rewrite sqlglot AST to remove unused columns projections.</span>
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</span><span id="L-20"><a href="#L-20"><span class="linenos"> 20</span></a>
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</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>
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</span><span id="L-92"><a href="#L-92"><span class="linenos"> 92</span></a>
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</span><span id="L-93"><a href="#L-93"><span class="linenos"> 93</span></a>
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</span><span id="L-94"><a href="#L-94"><span class="linenos"> 94</span></a><span class="k">def</span> <span class="nf">_remove_unused_selections</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">parent_selections</span><span class="p">,</span> <span class="n">schema</span><span class="p">,</span> <span class="n">alias_count</span><span class="p">):</span>
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</span><span id="L-94"><a href="#L-94"><span class="linenos"> 94</span></a><span class="k">def</span><span class="w"> </span><span class="nf">_remove_unused_selections</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">parent_selections</span><span class="p">,</span> <span class="n">schema</span><span class="p">,</span> <span class="n">alias_count</span><span class="p">):</span>
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</span><span id="L-95"><a href="#L-95"><span class="linenos"> 95</span></a> <span class="n">order</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">"order"</span><span class="p">)</span>
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</span><span id="L-96"><a href="#L-96"><span class="linenos"> 96</span></a>
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</span><span id="L-97"><a href="#L-97"><span class="linenos"> 97</span></a> <span class="k">if</span> <span class="n">order</span><span class="p">:</span>
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</div>
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<a class="headerlink" href="#default_selection"></a>
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<div class="pdoc-code codehilite"><pre><span></span><span id="default_selection-14"><a href="#default_selection-14"><span class="linenos">14</span></a><span class="k">def</span> <span class="nf">default_selection</span><span class="p">(</span><span class="n">is_agg</span><span class="p">:</span> <span class="nb">bool</span><span class="p">)</span> <span class="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Alias</span><span class="p">:</span>
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<div class="pdoc-code codehilite"><pre><span></span><span id="default_selection-14"><a href="#default_selection-14"><span class="linenos">14</span></a><span class="k">def</span><span class="w"> </span><span class="nf">default_selection</span><span class="p">(</span><span class="n">is_agg</span><span class="p">:</span> <span class="nb">bool</span><span class="p">)</span> <span class="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Alias</span><span class="p">:</span>
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</span><span id="default_selection-15"><a href="#default_selection-15"><span class="linenos">15</span></a> <span class="k">return</span> <span class="n">alias</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Max</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">Literal</span><span class="o">.</span><span class="n">number</span><span class="p">(</span><span class="mi">1</span><span class="p">))</span> <span class="k">if</span> <span class="n">is_agg</span> <span class="k">else</span> <span class="s2">"1"</span><span class="p">,</span> <span class="s2">"_"</span><span class="p">)</span>
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</span></pre></div>
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</div>
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<a class="headerlink" href="#pushdown_projections"></a>
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<div class="pdoc-code codehilite"><pre><span></span><span id="pushdown_projections-18"><a href="#pushdown_projections-18"><span class="linenos">18</span></a><span class="k">def</span> <span class="nf">pushdown_projections</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">schema</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">remove_unused_selections</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
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<div class="pdoc-code codehilite"><pre><span></span><span id="pushdown_projections-18"><a href="#pushdown_projections-18"><span class="linenos">18</span></a><span class="k">def</span><span class="w"> </span><span class="nf">pushdown_projections</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">schema</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">remove_unused_selections</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
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</span><span id="pushdown_projections-19"><a href="#pushdown_projections-19"><span class="linenos">19</span></a><span class="w"> </span><span class="sd">"""</span>
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</span><span id="pushdown_projections-20"><a href="#pushdown_projections-20"><span class="linenos">20</span></a><span class="sd"> Rewrite sqlglot AST to remove unused columns projections.</span>
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</span><span id="pushdown_projections-21"><a href="#pushdown_projections-21"><span class="linenos">21</span></a>
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@ -333,7 +333,7 @@
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<blockquote>
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<div class="pdoc-code codehilite">
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<pre><span></span><code><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">sqlglot</span>
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<pre><span></span><code><span class="gp">>>> </span><span class="kn">import</span><span class="w"> </span><span class="nn">sqlglot</span>
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<span class="gp">>>> </span><span class="n">sql</span> <span class="o">=</span> <span class="s2">"SELECT y.a AS a FROM (SELECT x.a AS a, x.b AS b FROM x) AS y"</span>
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<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="n">sql</span><span class="p">)</span>
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<span class="gp">>>> </span><span class="n">pushdown_projections</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>
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