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<h2>API Documentation</h2>
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<a class="function" href="#unalias_group">unalias_group</a>
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<a class="function" href="#eliminate_distinct_on">eliminate_distinct_on</a>
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<a class="function" href="#remove_precision_parameterized_types">remove_precision_parameterized_types</a>
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<a class="function" href="#explode_to_unnest">explode_to_unnest</a>
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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">__future__</span> <span class="kn">import</span> <span class="n">annotations</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">import</span> <span class="nn">typing</span> <span class="k">as</span> <span class="nn">t</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><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-6"><a href="#L-6"><span class="linenos"> 6</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 class="p">,</span> <span class="n">name_sequence</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="k">if</span> <span class="n">t</span><span class="o">.</span><span class="n">TYPE_CHECKING</span><span class="p">:</span>
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</span><span id="L-9"><a href="#L-9"><span class="linenos"> 9</span></a> <span class="kn">from</span> <span class="nn">sqlglot.generator</span> <span class="kn">import</span> <span class="n">Generator</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="k">def</span> <span class="nf">unalias_group</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="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</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="w"> </span><span class="sd">"""</span>
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</span><span id="L-14"><a href="#L-14"><span class="linenos"> 14</span></a><span class="sd"> Replace references to select aliases in GROUP BY clauses.</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><span class="sd"> Example:</span>
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</span><span id="L-17"><a href="#L-17"><span class="linenos"> 17</span></a><span class="sd"> >>> import sqlglot</span>
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</span><span id="L-18"><a href="#L-18"><span class="linenos"> 18</span></a><span class="sd"> >>> sqlglot.parse_one("SELECT a AS b FROM x GROUP BY b").transform(unalias_group).sql()</span>
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</span><span id="L-19"><a href="#L-19"><span class="linenos"> 19</span></a><span class="sd"> 'SELECT a AS b FROM x GROUP BY 1'</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-21"><a href="#L-21"><span class="linenos"> 21</span></a><span class="sd"> Args:</span>
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</span><span id="L-22"><a href="#L-22"><span class="linenos"> 22</span></a><span class="sd"> expression: the expression that will be transformed.</span>
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</span><span id="L-23"><a href="#L-23"><span class="linenos"> 23</span></a>
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</span><span id="L-24"><a href="#L-24"><span class="linenos"> 24</span></a><span class="sd"> Returns:</span>
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</span><span id="L-25"><a href="#L-25"><span class="linenos"> 25</span></a><span class="sd"> The transformed expression.</span>
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</span><span id="L-26"><a href="#L-26"><span class="linenos"> 26</span></a><span class="sd"> """</span>
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</span><span id="L-27"><a href="#L-27"><span class="linenos"> 27</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">Group</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">parent</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">):</span>
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</span><span id="L-28"><a href="#L-28"><span class="linenos"> 28</span></a> <span class="n">aliased_selects</span> <span class="o">=</span> <span class="p">{</span>
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</span><span id="L-29"><a href="#L-29"><span class="linenos"> 29</span></a> <span class="n">e</span><span class="o">.</span><span class="n">alias</span><span class="p">:</span> <span class="n">i</span>
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</span><span id="L-30"><a href="#L-30"><span class="linenos"> 30</span></a> <span class="k">for</span> <span class="n">i</span><span class="p">,</span> <span class="n">e</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">parent</span><span class="o">.</span><span class="n">expressions</span><span class="p">,</span> <span class="n">start</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>
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</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">e</span><span class="p">,</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-32"><a href="#L-32"><span class="linenos"> 32</span></a> <span class="p">}</span>
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</span><span id="L-33"><a href="#L-33"><span class="linenos"> 33</span></a>
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</span><span id="L-34"><a href="#L-34"><span class="linenos"> 34</span></a> <span class="k">for</span> <span class="n">group_by</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">expressions</span><span class="p">:</span>
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</span><span id="L-35"><a href="#L-35"><span class="linenos"> 35</span></a> <span class="k">if</span> <span class="p">(</span>
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</span><span id="L-36"><a href="#L-36"><span class="linenos"> 36</span></a> <span class="nb">isinstance</span><span class="p">(</span><span class="n">group_by</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">)</span>
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</span><span id="L-37"><a href="#L-37"><span class="linenos"> 37</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="n">group_by</span><span class="o">.</span><span class="n">table</span>
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</span><span id="L-38"><a href="#L-38"><span class="linenos"> 38</span></a> <span class="ow">and</span> <span class="n">group_by</span><span class="o">.</span><span class="n">name</span> <span class="ow">in</span> <span class="n">aliased_selects</span>
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</span><span id="L-39"><a href="#L-39"><span class="linenos"> 39</span></a> <span class="p">):</span>
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</span><span id="L-40"><a href="#L-40"><span class="linenos"> 40</span></a> <span class="n">group_by</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">Literal</span><span class="o">.</span><span class="n">number</span><span class="p">(</span><span class="n">aliased_selects</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">group_by</span><span class="o">.</span><span class="n">name</span><span class="p">)))</span>
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</span><span id="L-41"><a href="#L-41"><span class="linenos"> 41</span></a>
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</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>
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</span><span id="L-43"><a href="#L-43"><span class="linenos"> 43</span></a>
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</span><span id="L-44"><a href="#L-44"><span class="linenos"> 44</span></a>
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</span><span id="L-45"><a href="#L-45"><span class="linenos"> 45</span></a><span class="k">def</span> <span class="nf">eliminate_distinct_on</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="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span>
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</span><span id="L-46"><a href="#L-46"><span class="linenos"> 46</span></a><span class="w"> </span><span class="sd">"""</span>
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</span><span id="L-47"><a href="#L-47"><span class="linenos"> 47</span></a><span class="sd"> Convert SELECT DISTINCT ON statements to a subquery with a window function.</span>
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</span><span id="L-48"><a href="#L-48"><span class="linenos"> 48</span></a>
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</span><span id="L-49"><a href="#L-49"><span class="linenos"> 49</span></a><span class="sd"> This is useful for dialects that don't support SELECT DISTINCT ON but support window functions.</span>
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</span><span id="L-50"><a href="#L-50"><span class="linenos"> 50</span></a>
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</span><span id="L-51"><a href="#L-51"><span class="linenos"> 51</span></a><span class="sd"> Args:</span>
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</span><span id="L-52"><a href="#L-52"><span class="linenos"> 52</span></a><span class="sd"> expression: the expression that will be transformed.</span>
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</span><span id="L-53"><a href="#L-53"><span class="linenos"> 53</span></a>
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</span><span id="L-54"><a href="#L-54"><span class="linenos"> 54</span></a><span class="sd"> Returns:</span>
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</span><span id="L-55"><a href="#L-55"><span class="linenos"> 55</span></a><span class="sd"> The transformed expression.</span>
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</span><span id="L-56"><a href="#L-56"><span class="linenos"> 56</span></a><span class="sd"> """</span>
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</span><span id="L-57"><a href="#L-57"><span class="linenos"> 57</span></a> <span class="k">if</span> <span class="p">(</span>
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</span><span id="L-58"><a href="#L-58"><span class="linenos"> 58</span></a> <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">Select</span><span class="p">)</span>
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</span><span id="L-59"><a href="#L-59"><span class="linenos"> 59</span></a> <span class="ow">and</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>
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</span><span id="L-60"><a href="#L-60"><span class="linenos"> 60</span></a> <span class="ow">and</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"distinct"</span><span class="p">]</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>
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</span><span id="L-61"><a href="#L-61"><span class="linenos"> 61</span></a> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"distinct"</span><span class="p">]</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"on"</span><span class="p">],</span> <span class="n">exp</span><span class="o">.</span><span class="n">Tuple</span><span class="p">)</span>
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</span><span id="L-62"><a href="#L-62"><span class="linenos"> 62</span></a> <span class="p">):</span>
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</span><span id="L-63"><a href="#L-63"><span class="linenos"> 63</span></a> <span class="n">distinct_cols</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"distinct"</span><span class="p">]</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"on"</span><span class="p">]</span><span class="o">.</span><span class="n">expressions</span>
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</span><span id="L-64"><a href="#L-64"><span class="linenos"> 64</span></a> <span class="n">outer_selects</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">selects</span>
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</span><span id="L-65"><a href="#L-65"><span class="linenos"> 65</span></a> <span class="n">row_number</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">named_selects</span><span class="p">,</span> <span class="s2">"_row_number"</span><span class="p">)</span>
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</span><span id="L-66"><a href="#L-66"><span class="linenos"> 66</span></a> <span class="n">window</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">Window</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">RowNumber</span><span class="p">(),</span> <span class="n">partition_by</span><span class="o">=</span><span class="n">distinct_cols</span><span class="p">)</span>
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</span><span id="L-67"><a href="#L-67"><span class="linenos"> 67</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>
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</span><span id="L-68"><a href="#L-68"><span class="linenos"> 68</span></a>
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</span><span id="L-69"><a href="#L-69"><span class="linenos"> 69</span></a> <span class="k">if</span> <span class="n">order</span><span class="p">:</span>
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</span><span id="L-70"><a href="#L-70"><span class="linenos"> 70</span></a> <span class="n">window</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">order</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span><span class="o">.</span><span class="n">copy</span><span class="p">())</span>
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</span><span id="L-71"><a href="#L-71"><span class="linenos"> 71</span></a>
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</span><span id="L-72"><a href="#L-72"><span class="linenos"> 72</span></a> <span class="n">window</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">window</span><span class="p">,</span> <span class="n">row_number</span><span class="p">)</span>
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</span><span id="L-73"><a href="#L-73"><span class="linenos"> 73</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="n">window</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
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</span><span id="L-74"><a href="#L-74"><span class="linenos"> 74</span></a>
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</span><span id="L-75"><a href="#L-75"><span class="linenos"> 75</span></a> <span class="k">return</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">outer_selects</span><span class="p">)</span><span class="o">.</span><span class="n">from_</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">subquery</span><span class="p">())</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="sa">f</span><span class="s1">'"</span><span class="si">{</span><span class="n">row_number</span><span class="si">}</span><span class="s1">" = 1'</span><span class="p">)</span>
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</span><span id="L-76"><a href="#L-76"><span class="linenos"> 76</span></a>
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</span><span id="L-77"><a href="#L-77"><span class="linenos"> 77</span></a> <span class="k">return</span> <span class="n">expression</span>
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</span><span id="L-78"><a href="#L-78"><span class="linenos"> 78</span></a>
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</span><span id="L-79"><a href="#L-79"><span class="linenos"> 79</span></a>
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</span><span id="L-80"><a href="#L-80"><span class="linenos"> 80</span></a><span class="k">def</span> <span class="nf">eliminate_qualify</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="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span>
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|
</span><span id="L-81"><a href="#L-81"><span class="linenos"> 81</span></a><span class="w"> </span><span class="sd">"""</span>
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</span><span id="L-82"><a href="#L-82"><span class="linenos"> 82</span></a><span class="sd"> Convert SELECT statements that contain the QUALIFY clause into subqueries, filtered equivalently.</span>
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</span><span id="L-83"><a href="#L-83"><span class="linenos"> 83</span></a>
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|
</span><span id="L-84"><a href="#L-84"><span class="linenos"> 84</span></a><span class="sd"> The idea behind this transformation can be seen in Snowflake's documentation for QUALIFY:</span>
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|
</span><span id="L-85"><a href="#L-85"><span class="linenos"> 85</span></a><span class="sd"> https://docs.snowflake.com/en/sql-reference/constructs/qualify</span>
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</span><span id="L-86"><a href="#L-86"><span class="linenos"> 86</span></a>
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</span><span id="L-87"><a href="#L-87"><span class="linenos"> 87</span></a><span class="sd"> Some dialects don't support window functions in the WHERE clause, so we need to include them as</span>
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|
</span><span id="L-88"><a href="#L-88"><span class="linenos"> 88</span></a><span class="sd"> projections in the subquery, in order to refer to them in the outer filter using aliases. Also,</span>
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</span><span id="L-89"><a href="#L-89"><span class="linenos"> 89</span></a><span class="sd"> if a column is referenced in the QUALIFY clause but is not selected, we need to include it too,</span>
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</span><span id="L-90"><a href="#L-90"><span class="linenos"> 90</span></a><span class="sd"> otherwise we won't be able to refer to it in the outer query's WHERE clause.</span>
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</span><span id="L-91"><a href="#L-91"><span class="linenos"> 91</span></a><span class="sd"> """</span>
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</span><span id="L-92"><a href="#L-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">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">)</span> <span class="ow">and</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">"qualify"</span><span class="p">):</span>
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</span><span id="L-93"><a href="#L-93"><span class="linenos"> 93</span></a> <span class="n">taken</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">named_selects</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">for</span> <span class="n">select</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">selects</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="k">if</span> <span class="ow">not</span> <span class="n">select</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span>
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</span><span id="L-96"><a href="#L-96"><span class="linenos"> 96</span></a> <span class="n">alias</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="s2">"_c"</span><span class="p">)</span>
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</span><span id="L-97"><a href="#L-97"><span class="linenos"> 97</span></a> <span class="n">select</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">select</span><span class="p">,</span> <span class="n">alias</span><span class="p">))</span>
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</span><span id="L-98"><a href="#L-98"><span class="linenos"> 98</span></a> <span class="n">taken</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">alias</span><span class="p">)</span>
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</span><span id="L-99"><a href="#L-99"><span class="linenos"> 99</span></a>
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</span><span id="L-100"><a href="#L-100"><span class="linenos">100</span></a> <span class="n">outer_selects</span> <span class="o">=</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="p">[</span><span class="n">select</span><span class="o">.</span><span class="n">alias_or_name</span> <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">selects</span><span class="p">])</span>
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</span><span id="L-101"><a href="#L-101"><span class="linenos">101</span></a> <span class="n">qualify_filters</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"qualify"</span><span class="p">]</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span><span class="o">.</span><span class="n">this</span>
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</span><span id="L-102"><a href="#L-102"><span class="linenos">102</span></a>
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</span><span id="L-103"><a href="#L-103"><span class="linenos">103</span></a> <span class="n">select_candidates</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">Window</span> <span class="k">if</span> <span class="n">expression</span><span class="o">.</span><span class="n">is_star</span> <span class="k">else</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Window</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">)</span>
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</span><span id="L-104"><a href="#L-104"><span class="linenos">104</span></a> <span class="k">for</span> <span class="n">expr</span> <span class="ow">in</span> <span class="n">qualify_filters</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">select_candidates</span><span class="p">):</span>
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</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">expr</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Window</span><span class="p">):</span>
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</span><span id="L-106"><a href="#L-106"><span class="linenos">106</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">named_selects</span><span class="p">,</span> <span class="s2">"_w"</span><span class="p">)</span>
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</span><span id="L-107"><a href="#L-107"><span class="linenos">107</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">select</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">expr</span><span class="p">,</span> <span class="n">alias</span><span class="p">),</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
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</span><span id="L-108"><a href="#L-108"><span class="linenos">108</span></a> <span class="n">column</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column</span><span class="p">(</span><span class="n">alias</span><span class="p">)</span>
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</span><span id="L-109"><a href="#L-109"><span class="linenos">109</span></a>
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</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">expr</span><span class="o">.</span><span class="n">parent</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Qualify</span><span class="p">):</span>
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</span><span id="L-111"><a href="#L-111"><span class="linenos">111</span></a> <span class="n">qualify_filters</span> <span class="o">=</span> <span class="n">column</span>
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</span><span id="L-112"><a href="#L-112"><span class="linenos">112</span></a> <span class="k">else</span><span class="p">:</span>
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</span><span id="L-113"><a href="#L-113"><span class="linenos">113</span></a> <span class="n">expr</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">column</span><span class="p">)</span>
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</span><span id="L-114"><a href="#L-114"><span class="linenos">114</span></a> <span class="k">elif</span> <span class="n">expr</span><span class="o">.</span><span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">named_selects</span><span class="p">:</span>
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</span><span id="L-115"><a href="#L-115"><span class="linenos">115</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="n">expr</span><span class="o">.</span><span class="n">copy</span><span class="p">(),</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
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</span><span id="L-116"><a href="#L-116"><span class="linenos">116</span></a>
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</span><span id="L-117"><a href="#L-117"><span class="linenos">117</span></a> <span class="k">return</span> <span class="n">outer_selects</span><span class="o">.</span><span class="n">from_</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">subquery</span><span class="p">(</span><span class="n">alias</span><span class="o">=</span><span class="s2">"_t"</span><span class="p">))</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">qualify_filters</span><span class="p">)</span>
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</span><span id="L-118"><a href="#L-118"><span class="linenos">118</span></a>
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|
</span><span id="L-119"><a href="#L-119"><span class="linenos">119</span></a> <span class="k">return</span> <span class="n">expression</span>
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|
</span><span id="L-120"><a href="#L-120"><span class="linenos">120</span></a>
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|
</span><span id="L-121"><a href="#L-121"><span class="linenos">121</span></a>
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</span><span id="L-122"><a href="#L-122"><span class="linenos">122</span></a><span class="k">def</span> <span class="nf">remove_precision_parameterized_types</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="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span>
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|
</span><span id="L-123"><a href="#L-123"><span class="linenos">123</span></a><span class="w"> </span><span class="sd">"""</span>
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|
</span><span id="L-124"><a href="#L-124"><span class="linenos">124</span></a><span class="sd"> Some dialects only allow the precision for parameterized types to be defined in the DDL and not in</span>
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</span><span id="L-125"><a href="#L-125"><span class="linenos">125</span></a><span class="sd"> other expressions. This transforms removes the precision from parameterized types in expressions.</span>
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</span><span id="L-126"><a href="#L-126"><span class="linenos">126</span></a><span class="sd"> """</span>
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</span><span id="L-127"><a href="#L-127"><span class="linenos">127</span></a> <span class="k">for</span> <span class="n">node</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">DataType</span><span class="p">):</span>
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</span><span id="L-128"><a href="#L-128"><span class="linenos">128</span></a> <span class="n">node</span><span class="o">.</span><span class="n">set</span><span class="p">(</span>
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</span><span id="L-129"><a href="#L-129"><span class="linenos">129</span></a> <span class="s2">"expressions"</span><span class="p">,</span> <span class="p">[</span><span class="n">e</span> <span class="k">for</span> <span class="n">e</span> <span class="ow">in</span> <span class="n">node</span><span class="o">.</span><span class="n">expressions</span> <span class="k">if</span> <span class="ow">not</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">DataTypeSize</span><span class="p">)]</span>
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</span><span id="L-130"><a href="#L-130"><span class="linenos">130</span></a> <span class="p">)</span>
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</span><span id="L-131"><a href="#L-131"><span class="linenos">131</span></a>
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</span><span id="L-132"><a href="#L-132"><span class="linenos">132</span></a> <span class="k">return</span> <span class="n">expression</span>
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</span><span id="L-133"><a href="#L-133"><span class="linenos">133</span></a>
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</span><span id="L-134"><a href="#L-134"><span class="linenos">134</span></a>
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</span><span id="L-135"><a href="#L-135"><span class="linenos">135</span></a><span class="k">def</span> <span class="nf">unnest_to_explode</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="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span>
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</span><span id="L-136"><a href="#L-136"><span class="linenos">136</span></a><span class="w"> </span><span class="sd">"""Convert cross join unnest into lateral view explode (used in presto -> hive)."""</span>
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</span><span id="L-137"><a href="#L-137"><span class="linenos">137</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">Select</span><span class="p">):</span>
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</span><span id="L-138"><a href="#L-138"><span class="linenos">138</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="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>
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</span><span id="L-139"><a href="#L-139"><span class="linenos">139</span></a> <span class="n">unnest</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">this</span>
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</span><span id="L-140"><a href="#L-140"><span class="linenos">140</span></a>
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</span><span id="L-141"><a href="#L-141"><span class="linenos">141</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">unnest</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Unnest</span><span class="p">):</span>
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</span><span id="L-142"><a href="#L-142"><span class="linenos">142</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">unnest</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">"alias"</span><span class="p">)</span>
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</span><span id="L-143"><a href="#L-143"><span class="linenos">143</span></a> <span class="n">udtf</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">Posexplode</span> <span class="k">if</span> <span class="n">unnest</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">"ordinality"</span><span class="p">)</span> <span class="k">else</span> <span class="n">exp</span><span class="o">.</span><span class="n">Explode</span>
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</span><span id="L-144"><a href="#L-144"><span class="linenos">144</span></a>
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</span><span id="L-145"><a href="#L-145"><span class="linenos">145</span></a> <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 class="o">.</span><span class="n">remove</span><span class="p">(</span><span class="n">join</span><span class="p">)</span>
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</span><span id="L-146"><a href="#L-146"><span class="linenos">146</span></a>
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</span><span id="L-147"><a href="#L-147"><span class="linenos">147</span></a> <span class="k">for</span> <span class="n">e</span><span class="p">,</span> <span class="n">column</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">unnest</span><span class="o">.</span><span class="n">expressions</span><span class="p">,</span> <span class="n">alias</span><span class="o">.</span><span class="n">columns</span> <span class="k">if</span> <span class="n">alias</span> <span class="k">else</span> <span class="p">[]):</span>
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</span><span id="L-148"><a href="#L-148"><span class="linenos">148</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">append</span><span class="p">(</span>
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</span><span id="L-149"><a href="#L-149"><span class="linenos">149</span></a> <span class="s2">"laterals"</span><span class="p">,</span>
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</span><span id="L-150"><a href="#L-150"><span class="linenos">150</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">Lateral</span><span class="p">(</span>
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</span><span id="L-151"><a href="#L-151"><span class="linenos">151</span></a> <span class="n">this</span><span class="o">=</span><span class="n">udtf</span><span class="p">(</span><span class="n">this</span><span class="o">=</span><span class="n">e</span><span class="p">),</span>
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</span><span id="L-152"><a href="#L-152"><span class="linenos">152</span></a> <span class="n">view</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span>
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</span><span id="L-153"><a href="#L-153"><span class="linenos">153</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">alias</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="n">columns</span><span class="o">=</span><span class="p">[</span><span class="n">column</span><span class="p">]),</span> <span class="c1"># type: ignore</span>
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</span><span id="L-154"><a href="#L-154"><span class="linenos">154</span></a> <span class="p">),</span>
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</span><span id="L-155"><a href="#L-155"><span class="linenos">155</span></a> <span class="p">)</span>
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</span><span id="L-156"><a href="#L-156"><span class="linenos">156</span></a>
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</span><span id="L-157"><a href="#L-157"><span class="linenos">157</span></a> <span class="k">return</span> <span class="n">expression</span>
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</span><span id="L-158"><a href="#L-158"><span class="linenos">158</span></a>
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</span><span id="L-159"><a href="#L-159"><span class="linenos">159</span></a>
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</span><span id="L-160"><a href="#L-160"><span class="linenos">160</span></a><span class="k">def</span> <span class="nf">explode_to_unnest</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="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span>
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</span><span id="L-161"><a href="#L-161"><span class="linenos">161</span></a><span class="w"> </span><span class="sd">"""Convert explode/posexplode into unnest (used in hive -> presto)."""</span>
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</span><span id="L-162"><a href="#L-162"><span class="linenos">162</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">Select</span><span class="p">):</span>
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</span><span id="L-163"><a href="#L-163"><span class="linenos">163</span></a> <span class="kn">from</span> <span class="nn">sqlglot.optimizer.scope</span> <span class="kn">import</span> <span class="n">Scope</span>
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</span><span id="L-164"><a href="#L-164"><span class="linenos">164</span></a>
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</span><span id="L-165"><a href="#L-165"><span class="linenos">165</span></a> <span class="n">taken_select_names</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">named_selects</span><span class="p">)</span>
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</span><span id="L-166"><a href="#L-166"><span class="linenos">166</span></a> <span class="n">taken_source_names</span> <span class="o">=</span> <span class="p">{</span><span class="n">name</span> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">_</span> <span class="ow">in</span> <span class="n">Scope</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span><span class="o">.</span><span class="n">references</span><span class="p">}</span>
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</span><span id="L-167"><a href="#L-167"><span class="linenos">167</span></a>
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</span><span id="L-168"><a href="#L-168"><span class="linenos">168</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">selects</span><span class="p">:</span>
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</span><span id="L-169"><a href="#L-169"><span class="linenos">169</span></a> <span class="n">to_replace</span> <span class="o">=</span> <span class="n">select</span>
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</span><span id="L-170"><a href="#L-170"><span class="linenos">170</span></a>
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</span><span id="L-171"><a href="#L-171"><span class="linenos">171</span></a> <span class="n">pos_alias</span> <span class="o">=</span> <span class="s2">""</span>
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</span><span id="L-172"><a href="#L-172"><span class="linenos">172</span></a> <span class="n">explode_alias</span> <span class="o">=</span> <span class="s2">""</span>
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|
</span><span id="L-173"><a href="#L-173"><span class="linenos">173</span></a>
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</span><span id="L-174"><a href="#L-174"><span class="linenos">174</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">select</span><span class="p">,</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-175"><a href="#L-175"><span class="linenos">175</span></a> <span class="n">explode_alias</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">alias</span>
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</span><span id="L-176"><a href="#L-176"><span class="linenos">176</span></a> <span class="n">select</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">this</span>
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</span><span id="L-177"><a href="#L-177"><span class="linenos">177</span></a> <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">select</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Aliases</span><span class="p">):</span>
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</span><span id="L-178"><a href="#L-178"><span class="linenos">178</span></a> <span class="n">pos_alias</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">aliases</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">name</span>
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</span><span id="L-179"><a href="#L-179"><span class="linenos">179</span></a> <span class="n">explode_alias</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">aliases</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">name</span>
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</span><span id="L-180"><a href="#L-180"><span class="linenos">180</span></a> <span class="n">select</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">this</span>
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</span><span id="L-181"><a href="#L-181"><span class="linenos">181</span></a>
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</span><span id="L-182"><a href="#L-182"><span class="linenos">182</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">select</span><span class="p">,</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Explode</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Posexplode</span><span class="p">)):</span>
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</span><span id="L-183"><a href="#L-183"><span class="linenos">183</span></a> <span class="n">is_posexplode</span> <span class="o">=</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">select</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Posexplode</span><span class="p">)</span>
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</span><span id="L-184"><a href="#L-184"><span class="linenos">184</span></a>
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</span><span id="L-185"><a href="#L-185"><span class="linenos">185</span></a> <span class="n">explode_arg</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">this</span>
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</span><span id="L-186"><a href="#L-186"><span class="linenos">186</span></a> <span class="n">unnest</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">Unnest</span><span class="p">(</span><span class="n">expressions</span><span class="o">=</span><span class="p">[</span><span class="n">explode_arg</span><span class="o">.</span><span class="n">copy</span><span class="p">()],</span> <span class="n">ordinality</span><span class="o">=</span><span class="n">is_posexplode</span><span class="p">)</span>
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</span><span id="L-187"><a href="#L-187"><span class="linenos">187</span></a>
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</span><span id="L-188"><a href="#L-188"><span class="linenos">188</span></a> <span class="c1"># This ensures that we won't use [POS]EXPLODE's argument as a new selection</span>
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</span><span id="L-189"><a href="#L-189"><span class="linenos">189</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">explode_arg</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">):</span>
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</span><span id="L-190"><a href="#L-190"><span class="linenos">190</span></a> <span class="n">taken_select_names</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">explode_arg</span><span class="o">.</span><span class="n">output_name</span><span class="p">)</span>
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</span><span id="L-191"><a href="#L-191"><span class="linenos">191</span></a>
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</span><span id="L-192"><a href="#L-192"><span class="linenos">192</span></a> <span class="n">unnest_source_alias</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">taken_source_names</span><span class="p">,</span> <span class="s2">"_u"</span><span class="p">)</span>
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</span><span id="L-193"><a href="#L-193"><span class="linenos">193</span></a> <span class="n">taken_source_names</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">unnest_source_alias</span><span class="p">)</span>
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</span><span id="L-194"><a href="#L-194"><span class="linenos">194</span></a>
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</span><span id="L-195"><a href="#L-195"><span class="linenos">195</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">explode_alias</span><span class="p">:</span>
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</span><span id="L-196"><a href="#L-196"><span class="linenos">196</span></a> <span class="n">explode_alias</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">taken_select_names</span><span class="p">,</span> <span class="s2">"col"</span><span class="p">)</span>
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</span><span id="L-197"><a href="#L-197"><span class="linenos">197</span></a> <span class="n">taken_select_names</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">explode_alias</span><span class="p">)</span>
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</span><span id="L-198"><a href="#L-198"><span class="linenos">198</span></a>
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</span><span id="L-199"><a href="#L-199"><span class="linenos">199</span></a> <span class="k">if</span> <span class="n">is_posexplode</span><span class="p">:</span>
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</span><span id="L-200"><a href="#L-200"><span class="linenos">200</span></a> <span class="n">pos_alias</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">taken_select_names</span><span class="p">,</span> <span class="s2">"pos"</span><span class="p">)</span>
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</span><span id="L-201"><a href="#L-201"><span class="linenos">201</span></a> <span class="n">taken_select_names</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">pos_alias</span><span class="p">)</span>
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</span><span id="L-202"><a href="#L-202"><span class="linenos">202</span></a>
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</span><span id="L-203"><a href="#L-203"><span class="linenos">203</span></a> <span class="k">if</span> <span class="n">is_posexplode</span><span class="p">:</span>
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</span><span id="L-204"><a href="#L-204"><span class="linenos">204</span></a> <span class="n">column_names</span> <span class="o">=</span> <span class="p">[</span><span class="n">explode_alias</span><span class="p">,</span> <span class="n">pos_alias</span><span class="p">]</span>
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</span><span id="L-205"><a href="#L-205"><span class="linenos">205</span></a> <span class="n">to_replace</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span>
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</span><span id="L-206"><a href="#L-206"><span class="linenos">206</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="n">pos_alias</span><span class="p">,</span> <span class="n">explode_alias</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
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</span><span id="L-207"><a href="#L-207"><span class="linenos">207</span></a> <span class="k">else</span><span class="p">:</span>
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</span><span id="L-208"><a href="#L-208"><span class="linenos">208</span></a> <span class="n">column_names</span> <span class="o">=</span> <span class="p">[</span><span class="n">explode_alias</span><span class="p">]</span>
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</span><span id="L-209"><a href="#L-209"><span class="linenos">209</span></a> <span class="n">to_replace</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">column</span><span class="p">(</span><span class="n">explode_alias</span><span class="p">))</span>
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</span><span id="L-210"><a href="#L-210"><span class="linenos">210</span></a>
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</span><span id="L-211"><a href="#L-211"><span class="linenos">211</span></a> <span class="n">unnest</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">unnest</span><span class="p">,</span> <span class="n">unnest_source_alias</span><span class="p">,</span> <span class="n">table</span><span class="o">=</span><span class="n">column_names</span><span class="p">)</span>
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|
</span><span id="L-212"><a href="#L-212"><span class="linenos">212</span></a>
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</span><span id="L-213"><a href="#L-213"><span class="linenos">213</span></a> <span class="k">if</span> <span class="ow">not</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>
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|
</span><span id="L-214"><a href="#L-214"><span class="linenos">214</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">from_</span><span class="p">(</span><span class="n">unnest</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-215"><a href="#L-215"><span class="linenos">215</span></a> <span class="k">else</span><span class="p">:</span>
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</span><span id="L-216"><a href="#L-216"><span class="linenos">216</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">unnest</span><span class="p">,</span> <span class="n">join_type</span><span class="o">=</span><span class="s2">"CROSS"</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
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</span><span id="L-217"><a href="#L-217"><span class="linenos">217</span></a>
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</span><span id="L-218"><a href="#L-218"><span class="linenos">218</span></a> <span class="k">return</span> <span class="n">expression</span>
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</span><span id="L-219"><a href="#L-219"><span class="linenos">219</span></a>
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</span><span id="L-220"><a href="#L-220"><span class="linenos">220</span></a>
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</span><span id="L-221"><a href="#L-221"><span class="linenos">221</span></a><span class="k">def</span> <span class="nf">remove_within_group_for_percentiles</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="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span>
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</span><span id="L-222"><a href="#L-222"><span class="linenos">222</span></a> <span class="k">if</span> <span class="p">(</span>
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|
</span><span id="L-223"><a href="#L-223"><span class="linenos">223</span></a> <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">WithinGroup</span><span class="p">)</span>
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</span><span id="L-224"><a href="#L-224"><span class="linenos">224</span></a> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">PercentileCont</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">PercentileDisc</span><span class="p">))</span>
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</span><span id="L-225"><a href="#L-225"><span class="linenos">225</span></a> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</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">Order</span><span class="p">)</span>
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</span><span id="L-226"><a href="#L-226"><span class="linenos">226</span></a> <span class="p">):</span>
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</span><span id="L-227"><a href="#L-227"><span class="linenos">227</span></a> <span class="n">quantile</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="n">this</span>
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</span><span id="L-228"><a href="#L-228"><span class="linenos">228</span></a> <span class="n">input_value</span> <span class="o">=</span> <span class="n">t</span><span class="o">.</span><span class="n">cast</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Ordered</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">Ordered</span><span class="p">))</span><span class="o">.</span><span class="n">this</span>
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</span><span id="L-229"><a href="#L-229"><span class="linenos">229</span></a> <span class="k">return</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">ApproxQuantile</span><span class="p">(</span><span class="n">this</span><span class="o">=</span><span class="n">input_value</span><span class="p">,</span> <span class="n">quantile</span><span class="o">=</span><span class="n">quantile</span><span class="p">))</span>
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</span><span id="L-230"><a href="#L-230"><span class="linenos">230</span></a>
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</span><span id="L-231"><a href="#L-231"><span class="linenos">231</span></a> <span class="k">return</span> <span class="n">expression</span>
|
|
</span><span id="L-232"><a href="#L-232"><span class="linenos">232</span></a>
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</span><span id="L-233"><a href="#L-233"><span class="linenos">233</span></a>
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</span><span id="L-234"><a href="#L-234"><span class="linenos">234</span></a><span class="k">def</span> <span class="nf">add_recursive_cte_column_names</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="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span>
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</span><span id="L-235"><a href="#L-235"><span class="linenos">235</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">With</span><span class="p">)</span> <span class="ow">and</span> <span class="n">expression</span><span class="o">.</span><span class="n">recursive</span><span class="p">:</span>
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</span><span id="L-236"><a href="#L-236"><span class="linenos">236</span></a> <span class="n">next_name</span> <span class="o">=</span> <span class="n">name_sequence</span><span class="p">(</span><span class="s2">"_c_"</span><span class="p">)</span>
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</span><span id="L-237"><a href="#L-237"><span class="linenos">237</span></a>
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</span><span id="L-238"><a href="#L-238"><span class="linenos">238</span></a> <span class="k">for</span> <span class="n">cte</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">expressions</span><span class="p">:</span>
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</span><span id="L-239"><a href="#L-239"><span class="linenos">239</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">cte</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"alias"</span><span class="p">]</span><span class="o">.</span><span class="n">columns</span><span class="p">:</span>
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</span><span id="L-240"><a href="#L-240"><span class="linenos">240</span></a> <span class="n">query</span> <span class="o">=</span> <span class="n">cte</span><span class="o">.</span><span class="n">this</span>
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</span><span id="L-241"><a href="#L-241"><span class="linenos">241</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">query</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Union</span><span class="p">):</span>
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</span><span id="L-242"><a href="#L-242"><span class="linenos">242</span></a> <span class="n">query</span> <span class="o">=</span> <span class="n">query</span><span class="o">.</span><span class="n">this</span>
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</span><span id="L-243"><a href="#L-243"><span class="linenos">243</span></a>
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</span><span id="L-244"><a href="#L-244"><span class="linenos">244</span></a> <span class="n">cte</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"alias"</span><span class="p">]</span><span class="o">.</span><span class="n">set</span><span class="p">(</span>
|
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</span><span id="L-245"><a href="#L-245"><span class="linenos">245</span></a> <span class="s2">"columns"</span><span class="p">,</span>
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</span><span id="L-246"><a href="#L-246"><span class="linenos">246</span></a> <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">s</span><span class="o">.</span><span class="n">alias_or_name</span> <span class="ow">or</span> <span class="n">next_name</span><span class="p">())</span> <span class="k">for</span> <span class="n">s</span> <span class="ow">in</span> <span class="n">query</span><span class="o">.</span><span class="n">selects</span><span class="p">],</span>
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</span><span id="L-247"><a href="#L-247"><span class="linenos">247</span></a> <span class="p">)</span>
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</span><span id="L-248"><a href="#L-248"><span class="linenos">248</span></a>
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|
</span><span id="L-249"><a href="#L-249"><span class="linenos">249</span></a> <span class="k">return</span> <span class="n">expression</span>
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|
</span><span id="L-250"><a href="#L-250"><span class="linenos">250</span></a>
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</span><span id="L-251"><a href="#L-251"><span class="linenos">251</span></a>
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</span><span id="L-252"><a href="#L-252"><span class="linenos">252</span></a><span class="k">def</span> <span class="nf">epoch_cast_to_ts</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="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span>
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</span><span id="L-253"><a href="#L-253"><span class="linenos">253</span></a> <span class="k">if</span> <span class="p">(</span>
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|
</span><span id="L-254"><a href="#L-254"><span class="linenos">254</span></a> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Cast</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">TryCast</span><span class="p">))</span>
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</span><span id="L-255"><a href="#L-255"><span class="linenos">255</span></a> <span class="ow">and</span> <span class="n">expression</span><span class="o">.</span><span class="n">name</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span> <span class="o">==</span> <span class="s2">"epoch"</span>
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</span><span id="L-256"><a href="#L-256"><span class="linenos">256</span></a> <span class="ow">and</span> <span class="n">expression</span><span class="o">.</span><span class="n">to</span><span class="o">.</span><span class="n">this</span> <span class="ow">in</span> <span class="n">exp</span><span class="o">.</span><span class="n">DataType</span><span class="o">.</span><span class="n">TEMPORAL_TYPES</span>
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</span><span id="L-257"><a href="#L-257"><span class="linenos">257</span></a> <span class="p">):</span>
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</span><span id="L-258"><a href="#L-258"><span class="linenos">258</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">this</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">Literal</span><span class="o">.</span><span class="n">string</span><span class="p">(</span><span class="s2">"1970-01-01 00:00:00"</span><span class="p">))</span>
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</span><span id="L-259"><a href="#L-259"><span class="linenos">259</span></a>
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|
</span><span id="L-260"><a href="#L-260"><span class="linenos">260</span></a> <span class="k">return</span> <span class="n">expression</span>
|
|
</span><span id="L-261"><a href="#L-261"><span class="linenos">261</span></a>
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</span><span id="L-262"><a href="#L-262"><span class="linenos">262</span></a>
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</span><span id="L-263"><a href="#L-263"><span class="linenos">263</span></a><span class="k">def</span> <span class="nf">preprocess</span><span class="p">(</span>
|
|
</span><span id="L-264"><a href="#L-264"><span class="linenos">264</span></a> <span class="n">transforms</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">List</span><span class="p">[</span><span class="n">t</span><span class="o">.</span><span class="n">Callable</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">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">]],</span>
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</span><span id="L-265"><a href="#L-265"><span class="linenos">265</span></a><span class="p">)</span> <span class="o">-></span> <span class="n">t</span><span class="o">.</span><span class="n">Callable</span><span class="p">[[</span><span class="n">Generator</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="nb">str</span><span class="p">]:</span>
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</span><span id="L-266"><a href="#L-266"><span class="linenos">266</span></a><span class="w"> </span><span class="sd">"""</span>
|
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</span><span id="L-267"><a href="#L-267"><span class="linenos">267</span></a><span class="sd"> Creates a new transform by chaining a sequence of transformations and converts the resulting</span>
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</span><span id="L-268"><a href="#L-268"><span class="linenos">268</span></a><span class="sd"> expression to SQL, using either the "_sql" method corresponding to the resulting expression,</span>
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</span><span id="L-269"><a href="#L-269"><span class="linenos">269</span></a><span class="sd"> or the appropriate `Generator.TRANSFORMS` function (when applicable -- see below).</span>
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</span><span id="L-270"><a href="#L-270"><span class="linenos">270</span></a>
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</span><span id="L-271"><a href="#L-271"><span class="linenos">271</span></a><span class="sd"> Args:</span>
|
|
</span><span id="L-272"><a href="#L-272"><span class="linenos">272</span></a><span class="sd"> transforms: sequence of transform functions. These will be called in order.</span>
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</span><span id="L-273"><a href="#L-273"><span class="linenos">273</span></a>
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</span><span id="L-274"><a href="#L-274"><span class="linenos">274</span></a><span class="sd"> Returns:</span>
|
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</span><span id="L-275"><a href="#L-275"><span class="linenos">275</span></a><span class="sd"> Function that can be used as a generator transform.</span>
|
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</span><span id="L-276"><a href="#L-276"><span class="linenos">276</span></a><span class="sd"> """</span>
|
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</span><span id="L-277"><a href="#L-277"><span class="linenos">277</span></a>
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</span><span id="L-278"><a href="#L-278"><span class="linenos">278</span></a> <span class="k">def</span> <span class="nf">_to_sql</span><span class="p">(</span><span class="bp">self</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="o">-></span> <span class="nb">str</span><span class="p">:</span>
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</span><span id="L-279"><a href="#L-279"><span class="linenos">279</span></a> <span class="n">expression_type</span> <span class="o">=</span> <span class="nb">type</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
|
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</span><span id="L-280"><a href="#L-280"><span class="linenos">280</span></a>
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</span><span id="L-281"><a href="#L-281"><span class="linenos">281</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">transforms</span><span class="p">[</span><span class="mi">0</span><span class="p">](</span><span class="n">expression</span><span class="o">.</span><span class="n">copy</span><span class="p">())</span>
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</span><span id="L-282"><a href="#L-282"><span class="linenos">282</span></a> <span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="n">transforms</span><span class="p">[</span><span class="mi">1</span><span class="p">:]:</span>
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</span><span id="L-283"><a href="#L-283"><span class="linenos">283</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">t</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
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</span><span id="L-284"><a href="#L-284"><span class="linenos">284</span></a>
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</span><span id="L-285"><a href="#L-285"><span class="linenos">285</span></a> <span class="n">_sql_handler</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="o">.</span><span class="n">key</span> <span class="o">+</span> <span class="s2">"_sql"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
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</span><span id="L-286"><a href="#L-286"><span class="linenos">286</span></a> <span class="k">if</span> <span class="n">_sql_handler</span><span class="p">:</span>
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</span><span id="L-287"><a href="#L-287"><span class="linenos">287</span></a> <span class="k">return</span> <span class="n">_sql_handler</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
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</span><span id="L-288"><a href="#L-288"><span class="linenos">288</span></a>
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</span><span id="L-289"><a href="#L-289"><span class="linenos">289</span></a> <span class="n">transforms_handler</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">TRANSFORMS</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="nb">type</span><span class="p">(</span><span class="n">expression</span><span class="p">))</span>
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</span><span id="L-290"><a href="#L-290"><span class="linenos">290</span></a> <span class="k">if</span> <span class="n">transforms_handler</span><span class="p">:</span>
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</span><span id="L-291"><a href="#L-291"><span class="linenos">291</span></a> <span class="c1"># Ensures we don't enter an infinite loop. This can happen when the original expression</span>
|
|
</span><span id="L-292"><a href="#L-292"><span class="linenos">292</span></a> <span class="c1"># has the same type as the final expression and there's no _sql method available for it,</span>
|
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</span><span id="L-293"><a href="#L-293"><span class="linenos">293</span></a> <span class="c1"># because then it'd re-enter _to_sql.</span>
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</span><span id="L-294"><a href="#L-294"><span class="linenos">294</span></a> <span class="k">if</span> <span class="n">expression_type</span> <span class="ow">is</span> <span class="nb">type</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
|
|
</span><span id="L-295"><a href="#L-295"><span class="linenos">295</span></a> <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span>
|
|
</span><span id="L-296"><a href="#L-296"><span class="linenos">296</span></a> <span class="sa">f</span><span class="s2">"Expression type </span><span class="si">{</span><span class="n">expression</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span><span class="si">}</span><span class="s2"> requires a _sql method in order to be transformed."</span>
|
|
</span><span id="L-297"><a href="#L-297"><span class="linenos">297</span></a> <span class="p">)</span>
|
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</span><span id="L-298"><a href="#L-298"><span class="linenos">298</span></a>
|
|
</span><span id="L-299"><a href="#L-299"><span class="linenos">299</span></a> <span class="k">return</span> <span class="n">transforms_handler</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="p">)</span>
|
|
</span><span id="L-300"><a href="#L-300"><span class="linenos">300</span></a>
|
|
</span><span id="L-301"><a href="#L-301"><span class="linenos">301</span></a> <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="sa">f</span><span class="s2">"Unsupported expression type </span><span class="si">{</span><span class="n">expression</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span><span class="si">}</span><span class="s2">."</span><span class="p">)</span>
|
|
</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 class="k">return</span> <span class="n">_to_sql</span>
|
|
</span></pre></div>
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</section>
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<section id="unalias_group">
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<input id="unalias_group-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1">
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<div class="attr function">
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<span class="def">def</span>
|
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<span class="name">unalias_group</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="return-annotation">) -> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span>:</span></span>
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<label class="view-source-button" for="unalias_group-view-source"><span>View Source</span></label>
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</div>
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<a class="headerlink" href="#unalias_group"></a>
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<div class="pdoc-code codehilite"><pre><span></span><span id="unalias_group-13"><a href="#unalias_group-13"><span class="linenos">13</span></a><span class="k">def</span> <span class="nf">unalias_group</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="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span>
|
|
</span><span id="unalias_group-14"><a href="#unalias_group-14"><span class="linenos">14</span></a><span class="w"> </span><span class="sd">"""</span>
|
|
</span><span id="unalias_group-15"><a href="#unalias_group-15"><span class="linenos">15</span></a><span class="sd"> Replace references to select aliases in GROUP BY clauses.</span>
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|
</span><span id="unalias_group-16"><a href="#unalias_group-16"><span class="linenos">16</span></a>
|
|
</span><span id="unalias_group-17"><a href="#unalias_group-17"><span class="linenos">17</span></a><span class="sd"> Example:</span>
|
|
</span><span id="unalias_group-18"><a href="#unalias_group-18"><span class="linenos">18</span></a><span class="sd"> >>> import sqlglot</span>
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|
</span><span id="unalias_group-19"><a href="#unalias_group-19"><span class="linenos">19</span></a><span class="sd"> >>> sqlglot.parse_one("SELECT a AS b FROM x GROUP BY b").transform(unalias_group).sql()</span>
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</span><span id="unalias_group-20"><a href="#unalias_group-20"><span class="linenos">20</span></a><span class="sd"> 'SELECT a AS b FROM x GROUP BY 1'</span>
|
|
</span><span id="unalias_group-21"><a href="#unalias_group-21"><span class="linenos">21</span></a>
|
|
</span><span id="unalias_group-22"><a href="#unalias_group-22"><span class="linenos">22</span></a><span class="sd"> Args:</span>
|
|
</span><span id="unalias_group-23"><a href="#unalias_group-23"><span class="linenos">23</span></a><span class="sd"> expression: the expression that will be transformed.</span>
|
|
</span><span id="unalias_group-24"><a href="#unalias_group-24"><span class="linenos">24</span></a>
|
|
</span><span id="unalias_group-25"><a href="#unalias_group-25"><span class="linenos">25</span></a><span class="sd"> Returns:</span>
|
|
</span><span id="unalias_group-26"><a href="#unalias_group-26"><span class="linenos">26</span></a><span class="sd"> The transformed expression.</span>
|
|
</span><span id="unalias_group-27"><a href="#unalias_group-27"><span class="linenos">27</span></a><span class="sd"> """</span>
|
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</span><span id="unalias_group-28"><a href="#unalias_group-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">Group</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">parent</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">):</span>
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</span><span id="unalias_group-29"><a href="#unalias_group-29"><span class="linenos">29</span></a> <span class="n">aliased_selects</span> <span class="o">=</span> <span class="p">{</span>
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</span><span id="unalias_group-30"><a href="#unalias_group-30"><span class="linenos">30</span></a> <span class="n">e</span><span class="o">.</span><span class="n">alias</span><span class="p">:</span> <span class="n">i</span>
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</span><span id="unalias_group-31"><a href="#unalias_group-31"><span class="linenos">31</span></a> <span class="k">for</span> <span class="n">i</span><span class="p">,</span> <span class="n">e</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">parent</span><span class="o">.</span><span class="n">expressions</span><span class="p">,</span> <span class="n">start</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>
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</span><span id="unalias_group-32"><a href="#unalias_group-32"><span class="linenos">32</span></a> <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="unalias_group-33"><a href="#unalias_group-33"><span class="linenos">33</span></a> <span class="p">}</span>
|
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</span><span id="unalias_group-34"><a href="#unalias_group-34"><span class="linenos">34</span></a>
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</span><span id="unalias_group-35"><a href="#unalias_group-35"><span class="linenos">35</span></a> <span class="k">for</span> <span class="n">group_by</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">expressions</span><span class="p">:</span>
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</span><span id="unalias_group-36"><a href="#unalias_group-36"><span class="linenos">36</span></a> <span class="k">if</span> <span class="p">(</span>
|
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</span><span id="unalias_group-37"><a href="#unalias_group-37"><span class="linenos">37</span></a> <span class="nb">isinstance</span><span class="p">(</span><span class="n">group_by</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">)</span>
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</span><span id="unalias_group-38"><a href="#unalias_group-38"><span class="linenos">38</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="n">group_by</span><span class="o">.</span><span class="n">table</span>
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</span><span id="unalias_group-39"><a href="#unalias_group-39"><span class="linenos">39</span></a> <span class="ow">and</span> <span class="n">group_by</span><span class="o">.</span><span class="n">name</span> <span class="ow">in</span> <span class="n">aliased_selects</span>
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|
</span><span id="unalias_group-40"><a href="#unalias_group-40"><span class="linenos">40</span></a> <span class="p">):</span>
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</span><span id="unalias_group-41"><a href="#unalias_group-41"><span class="linenos">41</span></a> <span class="n">group_by</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">Literal</span><span class="o">.</span><span class="n">number</span><span class="p">(</span><span class="n">aliased_selects</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">group_by</span><span class="o">.</span><span class="n">name</span><span class="p">)))</span>
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</span><span id="unalias_group-42"><a href="#unalias_group-42"><span class="linenos">42</span></a>
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</span><span id="unalias_group-43"><a href="#unalias_group-43"><span class="linenos">43</span></a> <span class="k">return</span> <span class="n">expression</span>
|
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</span></pre></div>
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<div class="docstring"><p>Replace references to select aliases in GROUP BY clauses.</p>
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|
<h6 id="example">Example:</h6>
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<blockquote>
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<div class="pdoc-code codehilite">
|
|
<pre><span></span><code><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">sqlglot</span>
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<span class="gp">>>> </span><span class="n"><a href="../sqlglot.html#parse_one">sqlglot.parse_one</a></span><span class="p">(</span><span class="s2">"SELECT a AS b FROM x GROUP BY b"</span><span class="p">)</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span><span class="n">unalias_group</span><span class="p">)</span><span class="o">.</span><span class="n">sql</span><span class="p">()</span>
|
|
<span class="go">'SELECT a AS b FROM x GROUP BY 1'</span>
|
|
</code></pre>
|
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</div>
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|
</blockquote>
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|
<h6 id="arguments">Arguments:</h6>
|
|
|
|
<ul>
|
|
<li><strong>expression:</strong> the expression that will be transformed.</li>
|
|
</ul>
|
|
|
|
<h6 id="returns">Returns:</h6>
|
|
|
|
<blockquote>
|
|
<p>The transformed expression.</p>
|
|
</blockquote>
|
|
</div>
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</section>
|
|
<section id="eliminate_distinct_on">
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<input id="eliminate_distinct_on-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1">
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<div class="attr function">
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|
|
<span class="def">def</span>
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|
<span class="name">eliminate_distinct_on</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="return-annotation">) -> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span>:</span></span>
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<label class="view-source-button" for="eliminate_distinct_on-view-source"><span>View Source</span></label>
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</div>
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<a class="headerlink" href="#eliminate_distinct_on"></a>
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<div class="pdoc-code codehilite"><pre><span></span><span id="eliminate_distinct_on-46"><a href="#eliminate_distinct_on-46"><span class="linenos">46</span></a><span class="k">def</span> <span class="nf">eliminate_distinct_on</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="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span>
|
|
</span><span id="eliminate_distinct_on-47"><a href="#eliminate_distinct_on-47"><span class="linenos">47</span></a><span class="w"> </span><span class="sd">"""</span>
|
|
</span><span id="eliminate_distinct_on-48"><a href="#eliminate_distinct_on-48"><span class="linenos">48</span></a><span class="sd"> Convert SELECT DISTINCT ON statements to a subquery with a window function.</span>
|
|
</span><span id="eliminate_distinct_on-49"><a href="#eliminate_distinct_on-49"><span class="linenos">49</span></a>
|
|
</span><span id="eliminate_distinct_on-50"><a href="#eliminate_distinct_on-50"><span class="linenos">50</span></a><span class="sd"> This is useful for dialects that don't support SELECT DISTINCT ON but support window functions.</span>
|
|
</span><span id="eliminate_distinct_on-51"><a href="#eliminate_distinct_on-51"><span class="linenos">51</span></a>
|
|
</span><span id="eliminate_distinct_on-52"><a href="#eliminate_distinct_on-52"><span class="linenos">52</span></a><span class="sd"> Args:</span>
|
|
</span><span id="eliminate_distinct_on-53"><a href="#eliminate_distinct_on-53"><span class="linenos">53</span></a><span class="sd"> expression: the expression that will be transformed.</span>
|
|
</span><span id="eliminate_distinct_on-54"><a href="#eliminate_distinct_on-54"><span class="linenos">54</span></a>
|
|
</span><span id="eliminate_distinct_on-55"><a href="#eliminate_distinct_on-55"><span class="linenos">55</span></a><span class="sd"> Returns:</span>
|
|
</span><span id="eliminate_distinct_on-56"><a href="#eliminate_distinct_on-56"><span class="linenos">56</span></a><span class="sd"> The transformed expression.</span>
|
|
</span><span id="eliminate_distinct_on-57"><a href="#eliminate_distinct_on-57"><span class="linenos">57</span></a><span class="sd"> """</span>
|
|
</span><span id="eliminate_distinct_on-58"><a href="#eliminate_distinct_on-58"><span class="linenos">58</span></a> <span class="k">if</span> <span class="p">(</span>
|
|
</span><span id="eliminate_distinct_on-59"><a href="#eliminate_distinct_on-59"><span class="linenos">59</span></a> <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">Select</span><span class="p">)</span>
|
|
</span><span id="eliminate_distinct_on-60"><a href="#eliminate_distinct_on-60"><span class="linenos">60</span></a> <span class="ow">and</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="eliminate_distinct_on-61"><a href="#eliminate_distinct_on-61"><span class="linenos">61</span></a> <span class="ow">and</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"distinct"</span><span class="p">]</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="eliminate_distinct_on-62"><a href="#eliminate_distinct_on-62"><span class="linenos">62</span></a> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"distinct"</span><span class="p">]</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"on"</span><span class="p">],</span> <span class="n">exp</span><span class="o">.</span><span class="n">Tuple</span><span class="p">)</span>
|
|
</span><span id="eliminate_distinct_on-63"><a href="#eliminate_distinct_on-63"><span class="linenos">63</span></a> <span class="p">):</span>
|
|
</span><span id="eliminate_distinct_on-64"><a href="#eliminate_distinct_on-64"><span class="linenos">64</span></a> <span class="n">distinct_cols</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"distinct"</span><span class="p">]</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"on"</span><span class="p">]</span><span class="o">.</span><span class="n">expressions</span>
|
|
</span><span id="eliminate_distinct_on-65"><a href="#eliminate_distinct_on-65"><span class="linenos">65</span></a> <span class="n">outer_selects</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">selects</span>
|
|
</span><span id="eliminate_distinct_on-66"><a href="#eliminate_distinct_on-66"><span class="linenos">66</span></a> <span class="n">row_number</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">named_selects</span><span class="p">,</span> <span class="s2">"_row_number"</span><span class="p">)</span>
|
|
</span><span id="eliminate_distinct_on-67"><a href="#eliminate_distinct_on-67"><span class="linenos">67</span></a> <span class="n">window</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">Window</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">RowNumber</span><span class="p">(),</span> <span class="n">partition_by</span><span class="o">=</span><span class="n">distinct_cols</span><span class="p">)</span>
|
|
</span><span id="eliminate_distinct_on-68"><a href="#eliminate_distinct_on-68"><span class="linenos">68</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="eliminate_distinct_on-69"><a href="#eliminate_distinct_on-69"><span class="linenos">69</span></a>
|
|
</span><span id="eliminate_distinct_on-70"><a href="#eliminate_distinct_on-70"><span class="linenos">70</span></a> <span class="k">if</span> <span class="n">order</span><span class="p">:</span>
|
|
</span><span id="eliminate_distinct_on-71"><a href="#eliminate_distinct_on-71"><span class="linenos">71</span></a> <span class="n">window</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">order</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span><span class="o">.</span><span class="n">copy</span><span class="p">())</span>
|
|
</span><span id="eliminate_distinct_on-72"><a href="#eliminate_distinct_on-72"><span class="linenos">72</span></a>
|
|
</span><span id="eliminate_distinct_on-73"><a href="#eliminate_distinct_on-73"><span class="linenos">73</span></a> <span class="n">window</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">window</span><span class="p">,</span> <span class="n">row_number</span><span class="p">)</span>
|
|
</span><span id="eliminate_distinct_on-74"><a href="#eliminate_distinct_on-74"><span class="linenos">74</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="n">window</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="eliminate_distinct_on-75"><a href="#eliminate_distinct_on-75"><span class="linenos">75</span></a>
|
|
</span><span id="eliminate_distinct_on-76"><a href="#eliminate_distinct_on-76"><span class="linenos">76</span></a> <span class="k">return</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">outer_selects</span><span class="p">)</span><span class="o">.</span><span class="n">from_</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">subquery</span><span class="p">())</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="sa">f</span><span class="s1">'"</span><span class="si">{</span><span class="n">row_number</span><span class="si">}</span><span class="s1">" = 1'</span><span class="p">)</span>
|
|
</span><span id="eliminate_distinct_on-77"><a href="#eliminate_distinct_on-77"><span class="linenos">77</span></a>
|
|
</span><span id="eliminate_distinct_on-78"><a href="#eliminate_distinct_on-78"><span class="linenos">78</span></a> <span class="k">return</span> <span class="n">expression</span>
|
|
</span></pre></div>
|
|
|
|
|
|
<div class="docstring"><p>Convert SELECT DISTINCT ON statements to a subquery with a window function.</p>
|
|
|
|
<p>This is useful for dialects that don't support SELECT DISTINCT ON but support window functions.</p>
|
|
|
|
<h6 id="arguments">Arguments:</h6>
|
|
|
|
<ul>
|
|
<li><strong>expression:</strong> the expression that will be transformed.</li>
|
|
</ul>
|
|
|
|
<h6 id="returns">Returns:</h6>
|
|
|
|
<blockquote>
|
|
<p>The transformed expression.</p>
|
|
</blockquote>
|
|
</div>
|
|
|
|
|
|
</section>
|
|
<section id="eliminate_qualify">
|
|
<input id="eliminate_qualify-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1">
|
|
<div class="attr function">
|
|
|
|
<span class="def">def</span>
|
|
<span class="name">eliminate_qualify</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="return-annotation">) -> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span>:</span></span>
|
|
|
|
<label class="view-source-button" for="eliminate_qualify-view-source"><span>View Source</span></label>
|
|
|
|
</div>
|
|
<a class="headerlink" href="#eliminate_qualify"></a>
|
|
<div class="pdoc-code codehilite"><pre><span></span><span id="eliminate_qualify-81"><a href="#eliminate_qualify-81"><span class="linenos"> 81</span></a><span class="k">def</span> <span class="nf">eliminate_qualify</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="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span>
|
|
</span><span id="eliminate_qualify-82"><a href="#eliminate_qualify-82"><span class="linenos"> 82</span></a><span class="w"> </span><span class="sd">"""</span>
|
|
</span><span id="eliminate_qualify-83"><a href="#eliminate_qualify-83"><span class="linenos"> 83</span></a><span class="sd"> Convert SELECT statements that contain the QUALIFY clause into subqueries, filtered equivalently.</span>
|
|
</span><span id="eliminate_qualify-84"><a href="#eliminate_qualify-84"><span class="linenos"> 84</span></a>
|
|
</span><span id="eliminate_qualify-85"><a href="#eliminate_qualify-85"><span class="linenos"> 85</span></a><span class="sd"> The idea behind this transformation can be seen in Snowflake's documentation for QUALIFY:</span>
|
|
</span><span id="eliminate_qualify-86"><a href="#eliminate_qualify-86"><span class="linenos"> 86</span></a><span class="sd"> https://docs.snowflake.com/en/sql-reference/constructs/qualify</span>
|
|
</span><span id="eliminate_qualify-87"><a href="#eliminate_qualify-87"><span class="linenos"> 87</span></a>
|
|
</span><span id="eliminate_qualify-88"><a href="#eliminate_qualify-88"><span class="linenos"> 88</span></a><span class="sd"> Some dialects don't support window functions in the WHERE clause, so we need to include them as</span>
|
|
</span><span id="eliminate_qualify-89"><a href="#eliminate_qualify-89"><span class="linenos"> 89</span></a><span class="sd"> projections in the subquery, in order to refer to them in the outer filter using aliases. Also,</span>
|
|
</span><span id="eliminate_qualify-90"><a href="#eliminate_qualify-90"><span class="linenos"> 90</span></a><span class="sd"> if a column is referenced in the QUALIFY clause but is not selected, we need to include it too,</span>
|
|
</span><span id="eliminate_qualify-91"><a href="#eliminate_qualify-91"><span class="linenos"> 91</span></a><span class="sd"> otherwise we won't be able to refer to it in the outer query's WHERE clause.</span>
|
|
</span><span id="eliminate_qualify-92"><a href="#eliminate_qualify-92"><span class="linenos"> 92</span></a><span class="sd"> """</span>
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|
</span><span id="eliminate_qualify-93"><a href="#eliminate_qualify-93"><span class="linenos"> 93</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">Select</span><span class="p">)</span> <span class="ow">and</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">"qualify"</span><span class="p">):</span>
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|
</span><span id="eliminate_qualify-94"><a href="#eliminate_qualify-94"><span class="linenos"> 94</span></a> <span class="n">taken</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">named_selects</span><span class="p">)</span>
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</span><span id="eliminate_qualify-95"><a href="#eliminate_qualify-95"><span class="linenos"> 95</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">selects</span><span class="p">:</span>
|
|
</span><span id="eliminate_qualify-96"><a href="#eliminate_qualify-96"><span class="linenos"> 96</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">select</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span>
|
|
</span><span id="eliminate_qualify-97"><a href="#eliminate_qualify-97"><span class="linenos"> 97</span></a> <span class="n">alias</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="s2">"_c"</span><span class="p">)</span>
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</span><span id="eliminate_qualify-98"><a href="#eliminate_qualify-98"><span class="linenos"> 98</span></a> <span class="n">select</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">select</span><span class="p">,</span> <span class="n">alias</span><span class="p">))</span>
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|
</span><span id="eliminate_qualify-99"><a href="#eliminate_qualify-99"><span class="linenos"> 99</span></a> <span class="n">taken</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">alias</span><span class="p">)</span>
|
|
</span><span id="eliminate_qualify-100"><a href="#eliminate_qualify-100"><span class="linenos">100</span></a>
|
|
</span><span id="eliminate_qualify-101"><a href="#eliminate_qualify-101"><span class="linenos">101</span></a> <span class="n">outer_selects</span> <span class="o">=</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="p">[</span><span class="n">select</span><span class="o">.</span><span class="n">alias_or_name</span> <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">selects</span><span class="p">])</span>
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</span><span id="eliminate_qualify-102"><a href="#eliminate_qualify-102"><span class="linenos">102</span></a> <span class="n">qualify_filters</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"qualify"</span><span class="p">]</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span><span class="o">.</span><span class="n">this</span>
|
|
</span><span id="eliminate_qualify-103"><a href="#eliminate_qualify-103"><span class="linenos">103</span></a>
|
|
</span><span id="eliminate_qualify-104"><a href="#eliminate_qualify-104"><span class="linenos">104</span></a> <span class="n">select_candidates</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">Window</span> <span class="k">if</span> <span class="n">expression</span><span class="o">.</span><span class="n">is_star</span> <span class="k">else</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Window</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="eliminate_qualify-105"><a href="#eliminate_qualify-105"><span class="linenos">105</span></a> <span class="k">for</span> <span class="n">expr</span> <span class="ow">in</span> <span class="n">qualify_filters</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">select_candidates</span><span class="p">):</span>
|
|
</span><span id="eliminate_qualify-106"><a href="#eliminate_qualify-106"><span class="linenos">106</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expr</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="eliminate_qualify-107"><a href="#eliminate_qualify-107"><span class="linenos">107</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">named_selects</span><span class="p">,</span> <span class="s2">"_w"</span><span class="p">)</span>
|
|
</span><span id="eliminate_qualify-108"><a href="#eliminate_qualify-108"><span class="linenos">108</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">select</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">expr</span><span class="p">,</span> <span class="n">alias</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="eliminate_qualify-109"><a href="#eliminate_qualify-109"><span class="linenos">109</span></a> <span class="n">column</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column</span><span class="p">(</span><span class="n">alias</span><span class="p">)</span>
|
|
</span><span id="eliminate_qualify-110"><a href="#eliminate_qualify-110"><span class="linenos">110</span></a>
|
|
</span><span id="eliminate_qualify-111"><a href="#eliminate_qualify-111"><span class="linenos">111</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expr</span><span class="o">.</span><span class="n">parent</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Qualify</span><span class="p">):</span>
|
|
</span><span id="eliminate_qualify-112"><a href="#eliminate_qualify-112"><span class="linenos">112</span></a> <span class="n">qualify_filters</span> <span class="o">=</span> <span class="n">column</span>
|
|
</span><span id="eliminate_qualify-113"><a href="#eliminate_qualify-113"><span class="linenos">113</span></a> <span class="k">else</span><span class="p">:</span>
|
|
</span><span id="eliminate_qualify-114"><a href="#eliminate_qualify-114"><span class="linenos">114</span></a> <span class="n">expr</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">column</span><span class="p">)</span>
|
|
</span><span id="eliminate_qualify-115"><a href="#eliminate_qualify-115"><span class="linenos">115</span></a> <span class="k">elif</span> <span class="n">expr</span><span class="o">.</span><span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">named_selects</span><span class="p">:</span>
|
|
</span><span id="eliminate_qualify-116"><a href="#eliminate_qualify-116"><span class="linenos">116</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="n">expr</span><span class="o">.</span><span class="n">copy</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="eliminate_qualify-117"><a href="#eliminate_qualify-117"><span class="linenos">117</span></a>
|
|
</span><span id="eliminate_qualify-118"><a href="#eliminate_qualify-118"><span class="linenos">118</span></a> <span class="k">return</span> <span class="n">outer_selects</span><span class="o">.</span><span class="n">from_</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">subquery</span><span class="p">(</span><span class="n">alias</span><span class="o">=</span><span class="s2">"_t"</span><span class="p">))</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">qualify_filters</span><span class="p">)</span>
|
|
</span><span id="eliminate_qualify-119"><a href="#eliminate_qualify-119"><span class="linenos">119</span></a>
|
|
</span><span id="eliminate_qualify-120"><a href="#eliminate_qualify-120"><span class="linenos">120</span></a> <span class="k">return</span> <span class="n">expression</span>
|
|
</span></pre></div>
|
|
|
|
|
|
<div class="docstring"><p>Convert SELECT statements that contain the QUALIFY clause into subqueries, filtered equivalently.</p>
|
|
|
|
<p>The idea behind this transformation can be seen in Snowflake's documentation for QUALIFY:
|
|
<a href="https://docs.snowflake.com/en/sql-reference/constructs/qualify">https://docs.snowflake.com/en/sql-reference/constructs/qualify</a></p>
|
|
|
|
<p>Some dialects don't support window functions in the WHERE clause, so we need to include them as
|
|
projections in the subquery, in order to refer to them in the outer filter using aliases. Also,
|
|
if a column is referenced in the QUALIFY clause but is not selected, we need to include it too,
|
|
otherwise we won't be able to refer to it in the outer query's WHERE clause.</p>
|
|
</div>
|
|
|
|
|
|
</section>
|
|
<section id="remove_precision_parameterized_types">
|
|
<input id="remove_precision_parameterized_types-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1">
|
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<div class="attr function">
|
|
|
|
<span class="def">def</span>
|
|
<span class="name">remove_precision_parameterized_types</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="return-annotation">) -> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span>:</span></span>
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<label class="view-source-button" for="remove_precision_parameterized_types-view-source"><span>View Source</span></label>
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</div>
|
|
<a class="headerlink" href="#remove_precision_parameterized_types"></a>
|
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<div class="pdoc-code codehilite"><pre><span></span><span id="remove_precision_parameterized_types-123"><a href="#remove_precision_parameterized_types-123"><span class="linenos">123</span></a><span class="k">def</span> <span class="nf">remove_precision_parameterized_types</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="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span>
|
|
</span><span id="remove_precision_parameterized_types-124"><a href="#remove_precision_parameterized_types-124"><span class="linenos">124</span></a><span class="w"> </span><span class="sd">"""</span>
|
|
</span><span id="remove_precision_parameterized_types-125"><a href="#remove_precision_parameterized_types-125"><span class="linenos">125</span></a><span class="sd"> Some dialects only allow the precision for parameterized types to be defined in the DDL and not in</span>
|
|
</span><span id="remove_precision_parameterized_types-126"><a href="#remove_precision_parameterized_types-126"><span class="linenos">126</span></a><span class="sd"> other expressions. This transforms removes the precision from parameterized types in expressions.</span>
|
|
</span><span id="remove_precision_parameterized_types-127"><a href="#remove_precision_parameterized_types-127"><span class="linenos">127</span></a><span class="sd"> """</span>
|
|
</span><span id="remove_precision_parameterized_types-128"><a href="#remove_precision_parameterized_types-128"><span class="linenos">128</span></a> <span class="k">for</span> <span class="n">node</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">DataType</span><span class="p">):</span>
|
|
</span><span id="remove_precision_parameterized_types-129"><a href="#remove_precision_parameterized_types-129"><span class="linenos">129</span></a> <span class="n">node</span><span class="o">.</span><span class="n">set</span><span class="p">(</span>
|
|
</span><span id="remove_precision_parameterized_types-130"><a href="#remove_precision_parameterized_types-130"><span class="linenos">130</span></a> <span class="s2">"expressions"</span><span class="p">,</span> <span class="p">[</span><span class="n">e</span> <span class="k">for</span> <span class="n">e</span> <span class="ow">in</span> <span class="n">node</span><span class="o">.</span><span class="n">expressions</span> <span class="k">if</span> <span class="ow">not</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">DataTypeSize</span><span class="p">)]</span>
|
|
</span><span id="remove_precision_parameterized_types-131"><a href="#remove_precision_parameterized_types-131"><span class="linenos">131</span></a> <span class="p">)</span>
|
|
</span><span id="remove_precision_parameterized_types-132"><a href="#remove_precision_parameterized_types-132"><span class="linenos">132</span></a>
|
|
</span><span id="remove_precision_parameterized_types-133"><a href="#remove_precision_parameterized_types-133"><span class="linenos">133</span></a> <span class="k">return</span> <span class="n">expression</span>
|
|
</span></pre></div>
|
|
|
|
|
|
<div class="docstring"><p>Some dialects only allow the precision for parameterized types to be defined in the DDL and not in
|
|
other expressions. This transforms removes the precision from parameterized types in expressions.</p>
|
|
</div>
|
|
|
|
|
|
</section>
|
|
<section id="unnest_to_explode">
|
|
<input id="unnest_to_explode-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1">
|
|
<div class="attr function">
|
|
|
|
<span class="def">def</span>
|
|
<span class="name">unnest_to_explode</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="return-annotation">) -> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span>:</span></span>
|
|
|
|
<label class="view-source-button" for="unnest_to_explode-view-source"><span>View Source</span></label>
|
|
|
|
</div>
|
|
<a class="headerlink" href="#unnest_to_explode"></a>
|
|
<div class="pdoc-code codehilite"><pre><span></span><span id="unnest_to_explode-136"><a href="#unnest_to_explode-136"><span class="linenos">136</span></a><span class="k">def</span> <span class="nf">unnest_to_explode</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="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span>
|
|
</span><span id="unnest_to_explode-137"><a href="#unnest_to_explode-137"><span class="linenos">137</span></a><span class="w"> </span><span class="sd">"""Convert cross join unnest into lateral view explode (used in presto -> hive)."""</span>
|
|
</span><span id="unnest_to_explode-138"><a href="#unnest_to_explode-138"><span class="linenos">138</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">Select</span><span class="p">):</span>
|
|
</span><span id="unnest_to_explode-139"><a href="#unnest_to_explode-139"><span class="linenos">139</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="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="unnest_to_explode-140"><a href="#unnest_to_explode-140"><span class="linenos">140</span></a> <span class="n">unnest</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">this</span>
|
|
</span><span id="unnest_to_explode-141"><a href="#unnest_to_explode-141"><span class="linenos">141</span></a>
|
|
</span><span id="unnest_to_explode-142"><a href="#unnest_to_explode-142"><span class="linenos">142</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">unnest</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Unnest</span><span class="p">):</span>
|
|
</span><span id="unnest_to_explode-143"><a href="#unnest_to_explode-143"><span class="linenos">143</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">unnest</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">"alias"</span><span class="p">)</span>
|
|
</span><span id="unnest_to_explode-144"><a href="#unnest_to_explode-144"><span class="linenos">144</span></a> <span class="n">udtf</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">Posexplode</span> <span class="k">if</span> <span class="n">unnest</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">"ordinality"</span><span class="p">)</span> <span class="k">else</span> <span class="n">exp</span><span class="o">.</span><span class="n">Explode</span>
|
|
</span><span id="unnest_to_explode-145"><a href="#unnest_to_explode-145"><span class="linenos">145</span></a>
|
|
</span><span id="unnest_to_explode-146"><a href="#unnest_to_explode-146"><span class="linenos">146</span></a> <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 class="o">.</span><span class="n">remove</span><span class="p">(</span><span class="n">join</span><span class="p">)</span>
|
|
</span><span id="unnest_to_explode-147"><a href="#unnest_to_explode-147"><span class="linenos">147</span></a>
|
|
</span><span id="unnest_to_explode-148"><a href="#unnest_to_explode-148"><span class="linenos">148</span></a> <span class="k">for</span> <span class="n">e</span><span class="p">,</span> <span class="n">column</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">unnest</span><span class="o">.</span><span class="n">expressions</span><span class="p">,</span> <span class="n">alias</span><span class="o">.</span><span class="n">columns</span> <span class="k">if</span> <span class="n">alias</span> <span class="k">else</span> <span class="p">[]):</span>
|
|
</span><span id="unnest_to_explode-149"><a href="#unnest_to_explode-149"><span class="linenos">149</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">append</span><span class="p">(</span>
|
|
</span><span id="unnest_to_explode-150"><a href="#unnest_to_explode-150"><span class="linenos">150</span></a> <span class="s2">"laterals"</span><span class="p">,</span>
|
|
</span><span id="unnest_to_explode-151"><a href="#unnest_to_explode-151"><span class="linenos">151</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">Lateral</span><span class="p">(</span>
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</span><span id="unnest_to_explode-152"><a href="#unnest_to_explode-152"><span class="linenos">152</span></a> <span class="n">this</span><span class="o">=</span><span class="n">udtf</span><span class="p">(</span><span class="n">this</span><span class="o">=</span><span class="n">e</span><span class="p">),</span>
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</span><span id="unnest_to_explode-153"><a href="#unnest_to_explode-153"><span class="linenos">153</span></a> <span class="n">view</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span>
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</span><span id="unnest_to_explode-154"><a href="#unnest_to_explode-154"><span class="linenos">154</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">alias</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="n">columns</span><span class="o">=</span><span class="p">[</span><span class="n">column</span><span class="p">]),</span> <span class="c1"># type: ignore</span>
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</span><span id="unnest_to_explode-155"><a href="#unnest_to_explode-155"><span class="linenos">155</span></a> <span class="p">),</span>
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</span><span id="unnest_to_explode-156"><a href="#unnest_to_explode-156"><span class="linenos">156</span></a> <span class="p">)</span>
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</span><span id="unnest_to_explode-157"><a href="#unnest_to_explode-157"><span class="linenos">157</span></a>
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</span><span id="unnest_to_explode-158"><a href="#unnest_to_explode-158"><span class="linenos">158</span></a> <span class="k">return</span> <span class="n">expression</span>
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</span></pre></div>
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<div class="docstring"><p>Convert cross join unnest into lateral view explode (used in presto -> hive).</p>
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</div>
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</section>
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<section id="explode_to_unnest">
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<input id="explode_to_unnest-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1">
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<div class="attr function">
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<span class="def">def</span>
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<span class="name">explode_to_unnest</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="return-annotation">) -> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span>:</span></span>
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<label class="view-source-button" for="explode_to_unnest-view-source"><span>View Source</span></label>
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</div>
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<a class="headerlink" href="#explode_to_unnest"></a>
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<div class="pdoc-code codehilite"><pre><span></span><span id="explode_to_unnest-161"><a href="#explode_to_unnest-161"><span class="linenos">161</span></a><span class="k">def</span> <span class="nf">explode_to_unnest</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="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span>
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</span><span id="explode_to_unnest-162"><a href="#explode_to_unnest-162"><span class="linenos">162</span></a><span class="w"> </span><span class="sd">"""Convert explode/posexplode into unnest (used in hive -> presto)."""</span>
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</span><span id="explode_to_unnest-163"><a href="#explode_to_unnest-163"><span class="linenos">163</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">Select</span><span class="p">):</span>
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</span><span id="explode_to_unnest-164"><a href="#explode_to_unnest-164"><span class="linenos">164</span></a> <span class="kn">from</span> <span class="nn">sqlglot.optimizer.scope</span> <span class="kn">import</span> <span class="n">Scope</span>
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</span><span id="explode_to_unnest-165"><a href="#explode_to_unnest-165"><span class="linenos">165</span></a>
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</span><span id="explode_to_unnest-166"><a href="#explode_to_unnest-166"><span class="linenos">166</span></a> <span class="n">taken_select_names</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">named_selects</span><span class="p">)</span>
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</span><span id="explode_to_unnest-167"><a href="#explode_to_unnest-167"><span class="linenos">167</span></a> <span class="n">taken_source_names</span> <span class="o">=</span> <span class="p">{</span><span class="n">name</span> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">_</span> <span class="ow">in</span> <span class="n">Scope</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span><span class="o">.</span><span class="n">references</span><span class="p">}</span>
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</span><span id="explode_to_unnest-168"><a href="#explode_to_unnest-168"><span class="linenos">168</span></a>
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</span><span id="explode_to_unnest-169"><a href="#explode_to_unnest-169"><span class="linenos">169</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">selects</span><span class="p">:</span>
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</span><span id="explode_to_unnest-170"><a href="#explode_to_unnest-170"><span class="linenos">170</span></a> <span class="n">to_replace</span> <span class="o">=</span> <span class="n">select</span>
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</span><span id="explode_to_unnest-171"><a href="#explode_to_unnest-171"><span class="linenos">171</span></a>
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</span><span id="explode_to_unnest-172"><a href="#explode_to_unnest-172"><span class="linenos">172</span></a> <span class="n">pos_alias</span> <span class="o">=</span> <span class="s2">""</span>
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</span><span id="explode_to_unnest-173"><a href="#explode_to_unnest-173"><span class="linenos">173</span></a> <span class="n">explode_alias</span> <span class="o">=</span> <span class="s2">""</span>
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</span><span id="explode_to_unnest-174"><a href="#explode_to_unnest-174"><span class="linenos">174</span></a>
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</span><span id="explode_to_unnest-175"><a href="#explode_to_unnest-175"><span class="linenos">175</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">select</span><span class="p">,</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="explode_to_unnest-176"><a href="#explode_to_unnest-176"><span class="linenos">176</span></a> <span class="n">explode_alias</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">alias</span>
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</span><span id="explode_to_unnest-177"><a href="#explode_to_unnest-177"><span class="linenos">177</span></a> <span class="n">select</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">this</span>
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</span><span id="explode_to_unnest-178"><a href="#explode_to_unnest-178"><span class="linenos">178</span></a> <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">select</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Aliases</span><span class="p">):</span>
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</span><span id="explode_to_unnest-179"><a href="#explode_to_unnest-179"><span class="linenos">179</span></a> <span class="n">pos_alias</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">aliases</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">name</span>
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</span><span id="explode_to_unnest-180"><a href="#explode_to_unnest-180"><span class="linenos">180</span></a> <span class="n">explode_alias</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">aliases</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">name</span>
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</span><span id="explode_to_unnest-181"><a href="#explode_to_unnest-181"><span class="linenos">181</span></a> <span class="n">select</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">this</span>
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</span><span id="explode_to_unnest-182"><a href="#explode_to_unnest-182"><span class="linenos">182</span></a>
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</span><span id="explode_to_unnest-183"><a href="#explode_to_unnest-183"><span class="linenos">183</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">select</span><span class="p">,</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Explode</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Posexplode</span><span class="p">)):</span>
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</span><span id="explode_to_unnest-184"><a href="#explode_to_unnest-184"><span class="linenos">184</span></a> <span class="n">is_posexplode</span> <span class="o">=</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">select</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Posexplode</span><span class="p">)</span>
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</span><span id="explode_to_unnest-185"><a href="#explode_to_unnest-185"><span class="linenos">185</span></a>
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</span><span id="explode_to_unnest-186"><a href="#explode_to_unnest-186"><span class="linenos">186</span></a> <span class="n">explode_arg</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">this</span>
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</span><span id="explode_to_unnest-187"><a href="#explode_to_unnest-187"><span class="linenos">187</span></a> <span class="n">unnest</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">Unnest</span><span class="p">(</span><span class="n">expressions</span><span class="o">=</span><span class="p">[</span><span class="n">explode_arg</span><span class="o">.</span><span class="n">copy</span><span class="p">()],</span> <span class="n">ordinality</span><span class="o">=</span><span class="n">is_posexplode</span><span class="p">)</span>
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</span><span id="explode_to_unnest-188"><a href="#explode_to_unnest-188"><span class="linenos">188</span></a>
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</span><span id="explode_to_unnest-189"><a href="#explode_to_unnest-189"><span class="linenos">189</span></a> <span class="c1"># This ensures that we won't use [POS]EXPLODE's argument as a new selection</span>
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</span><span id="explode_to_unnest-190"><a href="#explode_to_unnest-190"><span class="linenos">190</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">explode_arg</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">):</span>
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</span><span id="explode_to_unnest-191"><a href="#explode_to_unnest-191"><span class="linenos">191</span></a> <span class="n">taken_select_names</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">explode_arg</span><span class="o">.</span><span class="n">output_name</span><span class="p">)</span>
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</span><span id="explode_to_unnest-192"><a href="#explode_to_unnest-192"><span class="linenos">192</span></a>
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</span><span id="explode_to_unnest-193"><a href="#explode_to_unnest-193"><span class="linenos">193</span></a> <span class="n">unnest_source_alias</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">taken_source_names</span><span class="p">,</span> <span class="s2">"_u"</span><span class="p">)</span>
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</span><span id="explode_to_unnest-194"><a href="#explode_to_unnest-194"><span class="linenos">194</span></a> <span class="n">taken_source_names</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">unnest_source_alias</span><span class="p">)</span>
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</span><span id="explode_to_unnest-195"><a href="#explode_to_unnest-195"><span class="linenos">195</span></a>
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</span><span id="explode_to_unnest-196"><a href="#explode_to_unnest-196"><span class="linenos">196</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">explode_alias</span><span class="p">:</span>
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</span><span id="explode_to_unnest-197"><a href="#explode_to_unnest-197"><span class="linenos">197</span></a> <span class="n">explode_alias</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">taken_select_names</span><span class="p">,</span> <span class="s2">"col"</span><span class="p">)</span>
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</span><span id="explode_to_unnest-198"><a href="#explode_to_unnest-198"><span class="linenos">198</span></a> <span class="n">taken_select_names</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">explode_alias</span><span class="p">)</span>
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</span><span id="explode_to_unnest-199"><a href="#explode_to_unnest-199"><span class="linenos">199</span></a>
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</span><span id="explode_to_unnest-200"><a href="#explode_to_unnest-200"><span class="linenos">200</span></a> <span class="k">if</span> <span class="n">is_posexplode</span><span class="p">:</span>
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</span><span id="explode_to_unnest-201"><a href="#explode_to_unnest-201"><span class="linenos">201</span></a> <span class="n">pos_alias</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">taken_select_names</span><span class="p">,</span> <span class="s2">"pos"</span><span class="p">)</span>
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</span><span id="explode_to_unnest-202"><a href="#explode_to_unnest-202"><span class="linenos">202</span></a> <span class="n">taken_select_names</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">pos_alias</span><span class="p">)</span>
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</span><span id="explode_to_unnest-203"><a href="#explode_to_unnest-203"><span class="linenos">203</span></a>
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</span><span id="explode_to_unnest-204"><a href="#explode_to_unnest-204"><span class="linenos">204</span></a> <span class="k">if</span> <span class="n">is_posexplode</span><span class="p">:</span>
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</span><span id="explode_to_unnest-205"><a href="#explode_to_unnest-205"><span class="linenos">205</span></a> <span class="n">column_names</span> <span class="o">=</span> <span class="p">[</span><span class="n">explode_alias</span><span class="p">,</span> <span class="n">pos_alias</span><span class="p">]</span>
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</span><span id="explode_to_unnest-206"><a href="#explode_to_unnest-206"><span class="linenos">206</span></a> <span class="n">to_replace</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span>
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</span><span id="explode_to_unnest-207"><a href="#explode_to_unnest-207"><span class="linenos">207</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="n">pos_alias</span><span class="p">,</span> <span class="n">explode_alias</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
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</span><span id="explode_to_unnest-208"><a href="#explode_to_unnest-208"><span class="linenos">208</span></a> <span class="k">else</span><span class="p">:</span>
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</span><span id="explode_to_unnest-209"><a href="#explode_to_unnest-209"><span class="linenos">209</span></a> <span class="n">column_names</span> <span class="o">=</span> <span class="p">[</span><span class="n">explode_alias</span><span class="p">]</span>
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</span><span id="explode_to_unnest-210"><a href="#explode_to_unnest-210"><span class="linenos">210</span></a> <span class="n">to_replace</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">column</span><span class="p">(</span><span class="n">explode_alias</span><span class="p">))</span>
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</span><span id="explode_to_unnest-211"><a href="#explode_to_unnest-211"><span class="linenos">211</span></a>
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</span><span id="explode_to_unnest-212"><a href="#explode_to_unnest-212"><span class="linenos">212</span></a> <span class="n">unnest</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">unnest</span><span class="p">,</span> <span class="n">unnest_source_alias</span><span class="p">,</span> <span class="n">table</span><span class="o">=</span><span class="n">column_names</span><span class="p">)</span>
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</span><span id="explode_to_unnest-213"><a href="#explode_to_unnest-213"><span class="linenos">213</span></a>
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</span><span id="explode_to_unnest-214"><a href="#explode_to_unnest-214"><span class="linenos">214</span></a> <span class="k">if</span> <span class="ow">not</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>
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</span><span id="explode_to_unnest-215"><a href="#explode_to_unnest-215"><span class="linenos">215</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">from_</span><span class="p">(</span><span class="n">unnest</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
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</span><span id="explode_to_unnest-216"><a href="#explode_to_unnest-216"><span class="linenos">216</span></a> <span class="k">else</span><span class="p">:</span>
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</span><span id="explode_to_unnest-217"><a href="#explode_to_unnest-217"><span class="linenos">217</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">unnest</span><span class="p">,</span> <span class="n">join_type</span><span class="o">=</span><span class="s2">"CROSS"</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
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</span><span id="explode_to_unnest-218"><a href="#explode_to_unnest-218"><span class="linenos">218</span></a>
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</span><span id="explode_to_unnest-219"><a href="#explode_to_unnest-219"><span class="linenos">219</span></a> <span class="k">return</span> <span class="n">expression</span>
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</span></pre></div>
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<div class="docstring"><p>Convert explode/posexplode into unnest (used in hive -> presto).</p>
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</div>
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</section>
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<section id="remove_within_group_for_percentiles">
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<input id="remove_within_group_for_percentiles-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1">
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<div class="attr function">
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<span class="def">def</span>
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<span class="name">remove_within_group_for_percentiles</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="return-annotation">) -> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span>:</span></span>
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<label class="view-source-button" for="remove_within_group_for_percentiles-view-source"><span>View Source</span></label>
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</div>
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<a class="headerlink" href="#remove_within_group_for_percentiles"></a>
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<div class="pdoc-code codehilite"><pre><span></span><span id="remove_within_group_for_percentiles-222"><a href="#remove_within_group_for_percentiles-222"><span class="linenos">222</span></a><span class="k">def</span> <span class="nf">remove_within_group_for_percentiles</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="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span>
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</span><span id="remove_within_group_for_percentiles-223"><a href="#remove_within_group_for_percentiles-223"><span class="linenos">223</span></a> <span class="k">if</span> <span class="p">(</span>
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</span><span id="remove_within_group_for_percentiles-224"><a href="#remove_within_group_for_percentiles-224"><span class="linenos">224</span></a> <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">WithinGroup</span><span class="p">)</span>
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</span><span id="remove_within_group_for_percentiles-225"><a href="#remove_within_group_for_percentiles-225"><span class="linenos">225</span></a> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">PercentileCont</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">PercentileDisc</span><span class="p">))</span>
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</span><span id="remove_within_group_for_percentiles-226"><a href="#remove_within_group_for_percentiles-226"><span class="linenos">226</span></a> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</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">Order</span><span class="p">)</span>
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</span><span id="remove_within_group_for_percentiles-227"><a href="#remove_within_group_for_percentiles-227"><span class="linenos">227</span></a> <span class="p">):</span>
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</span><span id="remove_within_group_for_percentiles-228"><a href="#remove_within_group_for_percentiles-228"><span class="linenos">228</span></a> <span class="n">quantile</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="n">this</span>
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</span><span id="remove_within_group_for_percentiles-229"><a href="#remove_within_group_for_percentiles-229"><span class="linenos">229</span></a> <span class="n">input_value</span> <span class="o">=</span> <span class="n">t</span><span class="o">.</span><span class="n">cast</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Ordered</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">Ordered</span><span class="p">))</span><span class="o">.</span><span class="n">this</span>
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</span><span id="remove_within_group_for_percentiles-230"><a href="#remove_within_group_for_percentiles-230"><span class="linenos">230</span></a> <span class="k">return</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">ApproxQuantile</span><span class="p">(</span><span class="n">this</span><span class="o">=</span><span class="n">input_value</span><span class="p">,</span> <span class="n">quantile</span><span class="o">=</span><span class="n">quantile</span><span class="p">))</span>
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</span><span id="remove_within_group_for_percentiles-231"><a href="#remove_within_group_for_percentiles-231"><span class="linenos">231</span></a>
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</span><span id="remove_within_group_for_percentiles-232"><a href="#remove_within_group_for_percentiles-232"><span class="linenos">232</span></a> <span class="k">return</span> <span class="n">expression</span>
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</span></pre></div>
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</section>
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<section id="add_recursive_cte_column_names">
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<input id="add_recursive_cte_column_names-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1">
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<div class="attr function">
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<span class="def">def</span>
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<span class="name">add_recursive_cte_column_names</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="return-annotation">) -> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span>:</span></span>
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<label class="view-source-button" for="add_recursive_cte_column_names-view-source"><span>View Source</span></label>
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</div>
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<a class="headerlink" href="#add_recursive_cte_column_names"></a>
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<div class="pdoc-code codehilite"><pre><span></span><span id="add_recursive_cte_column_names-235"><a href="#add_recursive_cte_column_names-235"><span class="linenos">235</span></a><span class="k">def</span> <span class="nf">add_recursive_cte_column_names</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="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span>
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</span><span id="add_recursive_cte_column_names-236"><a href="#add_recursive_cte_column_names-236"><span class="linenos">236</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">With</span><span class="p">)</span> <span class="ow">and</span> <span class="n">expression</span><span class="o">.</span><span class="n">recursive</span><span class="p">:</span>
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</span><span id="add_recursive_cte_column_names-237"><a href="#add_recursive_cte_column_names-237"><span class="linenos">237</span></a> <span class="n">next_name</span> <span class="o">=</span> <span class="n">name_sequence</span><span class="p">(</span><span class="s2">"_c_"</span><span class="p">)</span>
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</span><span id="add_recursive_cte_column_names-238"><a href="#add_recursive_cte_column_names-238"><span class="linenos">238</span></a>
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</span><span id="add_recursive_cte_column_names-239"><a href="#add_recursive_cte_column_names-239"><span class="linenos">239</span></a> <span class="k">for</span> <span class="n">cte</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">expressions</span><span class="p">:</span>
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</span><span id="add_recursive_cte_column_names-240"><a href="#add_recursive_cte_column_names-240"><span class="linenos">240</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">cte</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"alias"</span><span class="p">]</span><span class="o">.</span><span class="n">columns</span><span class="p">:</span>
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</span><span id="add_recursive_cte_column_names-241"><a href="#add_recursive_cte_column_names-241"><span class="linenos">241</span></a> <span class="n">query</span> <span class="o">=</span> <span class="n">cte</span><span class="o">.</span><span class="n">this</span>
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</span><span id="add_recursive_cte_column_names-242"><a href="#add_recursive_cte_column_names-242"><span class="linenos">242</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">query</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Union</span><span class="p">):</span>
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</span><span id="add_recursive_cte_column_names-243"><a href="#add_recursive_cte_column_names-243"><span class="linenos">243</span></a> <span class="n">query</span> <span class="o">=</span> <span class="n">query</span><span class="o">.</span><span class="n">this</span>
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</span><span id="add_recursive_cte_column_names-244"><a href="#add_recursive_cte_column_names-244"><span class="linenos">244</span></a>
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</span><span id="add_recursive_cte_column_names-245"><a href="#add_recursive_cte_column_names-245"><span class="linenos">245</span></a> <span class="n">cte</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"alias"</span><span class="p">]</span><span class="o">.</span><span class="n">set</span><span class="p">(</span>
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</span><span id="add_recursive_cte_column_names-246"><a href="#add_recursive_cte_column_names-246"><span class="linenos">246</span></a> <span class="s2">"columns"</span><span class="p">,</span>
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</span><span id="add_recursive_cte_column_names-247"><a href="#add_recursive_cte_column_names-247"><span class="linenos">247</span></a> <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">s</span><span class="o">.</span><span class="n">alias_or_name</span> <span class="ow">or</span> <span class="n">next_name</span><span class="p">())</span> <span class="k">for</span> <span class="n">s</span> <span class="ow">in</span> <span class="n">query</span><span class="o">.</span><span class="n">selects</span><span class="p">],</span>
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</span><span id="add_recursive_cte_column_names-248"><a href="#add_recursive_cte_column_names-248"><span class="linenos">248</span></a> <span class="p">)</span>
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</span><span id="add_recursive_cte_column_names-249"><a href="#add_recursive_cte_column_names-249"><span class="linenos">249</span></a>
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</span><span id="add_recursive_cte_column_names-250"><a href="#add_recursive_cte_column_names-250"><span class="linenos">250</span></a> <span class="k">return</span> <span class="n">expression</span>
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</span></pre></div>
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</section>
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<section id="epoch_cast_to_ts">
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<input id="epoch_cast_to_ts-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1">
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<div class="attr function">
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<span class="def">def</span>
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<span class="name">epoch_cast_to_ts</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="return-annotation">) -> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span>:</span></span>
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<label class="view-source-button" for="epoch_cast_to_ts-view-source"><span>View Source</span></label>
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</div>
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<a class="headerlink" href="#epoch_cast_to_ts"></a>
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<div class="pdoc-code codehilite"><pre><span></span><span id="epoch_cast_to_ts-253"><a href="#epoch_cast_to_ts-253"><span class="linenos">253</span></a><span class="k">def</span> <span class="nf">epoch_cast_to_ts</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="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span>
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</span><span id="epoch_cast_to_ts-254"><a href="#epoch_cast_to_ts-254"><span class="linenos">254</span></a> <span class="k">if</span> <span class="p">(</span>
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</span><span id="epoch_cast_to_ts-255"><a href="#epoch_cast_to_ts-255"><span class="linenos">255</span></a> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Cast</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">TryCast</span><span class="p">))</span>
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</span><span id="epoch_cast_to_ts-256"><a href="#epoch_cast_to_ts-256"><span class="linenos">256</span></a> <span class="ow">and</span> <span class="n">expression</span><span class="o">.</span><span class="n">name</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span> <span class="o">==</span> <span class="s2">"epoch"</span>
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</span><span id="epoch_cast_to_ts-257"><a href="#epoch_cast_to_ts-257"><span class="linenos">257</span></a> <span class="ow">and</span> <span class="n">expression</span><span class="o">.</span><span class="n">to</span><span class="o">.</span><span class="n">this</span> <span class="ow">in</span> <span class="n">exp</span><span class="o">.</span><span class="n">DataType</span><span class="o">.</span><span class="n">TEMPORAL_TYPES</span>
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</span><span id="epoch_cast_to_ts-258"><a href="#epoch_cast_to_ts-258"><span class="linenos">258</span></a> <span class="p">):</span>
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</span><span id="epoch_cast_to_ts-259"><a href="#epoch_cast_to_ts-259"><span class="linenos">259</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">this</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">Literal</span><span class="o">.</span><span class="n">string</span><span class="p">(</span><span class="s2">"1970-01-01 00:00:00"</span><span class="p">))</span>
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</span><span id="epoch_cast_to_ts-260"><a href="#epoch_cast_to_ts-260"><span class="linenos">260</span></a>
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</span><span id="epoch_cast_to_ts-261"><a href="#epoch_cast_to_ts-261"><span class="linenos">261</span></a> <span class="k">return</span> <span class="n">expression</span>
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</span></pre></div>
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</section>
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<section id="preprocess">
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<input id="preprocess-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1">
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<div class="attr function">
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<span class="def">def</span>
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<span class="name">preprocess</span><span class="signature pdoc-code multiline">(<span class="param"> <span class="n">transforms</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="n">Callable</span><span class="p">[[</span><span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span><span class="p">],</span> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span><span class="p">]]</span></span><span class="return-annotation">) -> <span class="n">Callable</span><span class="p">[[</span><span class="n"><a href="generator.html#Generator">sqlglot.generator.Generator</a></span><span class="p">,</span> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span><span class="p">],</span> <span class="nb">str</span><span class="p">]</span>:</span></span>
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<label class="view-source-button" for="preprocess-view-source"><span>View Source</span></label>
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</div>
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<a class="headerlink" href="#preprocess"></a>
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<div class="pdoc-code codehilite"><pre><span></span><span id="preprocess-264"><a href="#preprocess-264"><span class="linenos">264</span></a><span class="k">def</span> <span class="nf">preprocess</span><span class="p">(</span>
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</span><span id="preprocess-265"><a href="#preprocess-265"><span class="linenos">265</span></a> <span class="n">transforms</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">List</span><span class="p">[</span><span class="n">t</span><span class="o">.</span><span class="n">Callable</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">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">]],</span>
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</span><span id="preprocess-266"><a href="#preprocess-266"><span class="linenos">266</span></a><span class="p">)</span> <span class="o">-></span> <span class="n">t</span><span class="o">.</span><span class="n">Callable</span><span class="p">[[</span><span class="n">Generator</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="nb">str</span><span class="p">]:</span>
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</span><span id="preprocess-267"><a href="#preprocess-267"><span class="linenos">267</span></a><span class="w"> </span><span class="sd">"""</span>
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</span><span id="preprocess-268"><a href="#preprocess-268"><span class="linenos">268</span></a><span class="sd"> Creates a new transform by chaining a sequence of transformations and converts the resulting</span>
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</span><span id="preprocess-269"><a href="#preprocess-269"><span class="linenos">269</span></a><span class="sd"> expression to SQL, using either the "_sql" method corresponding to the resulting expression,</span>
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</span><span id="preprocess-270"><a href="#preprocess-270"><span class="linenos">270</span></a><span class="sd"> or the appropriate `Generator.TRANSFORMS` function (when applicable -- see below).</span>
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</span><span id="preprocess-271"><a href="#preprocess-271"><span class="linenos">271</span></a>
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</span><span id="preprocess-272"><a href="#preprocess-272"><span class="linenos">272</span></a><span class="sd"> Args:</span>
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</span><span id="preprocess-273"><a href="#preprocess-273"><span class="linenos">273</span></a><span class="sd"> transforms: sequence of transform functions. These will be called in order.</span>
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</span><span id="preprocess-274"><a href="#preprocess-274"><span class="linenos">274</span></a>
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</span><span id="preprocess-275"><a href="#preprocess-275"><span class="linenos">275</span></a><span class="sd"> Returns:</span>
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</span><span id="preprocess-276"><a href="#preprocess-276"><span class="linenos">276</span></a><span class="sd"> Function that can be used as a generator transform.</span>
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</span><span id="preprocess-277"><a href="#preprocess-277"><span class="linenos">277</span></a><span class="sd"> """</span>
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</span><span id="preprocess-278"><a href="#preprocess-278"><span class="linenos">278</span></a>
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</span><span id="preprocess-279"><a href="#preprocess-279"><span class="linenos">279</span></a> <span class="k">def</span> <span class="nf">_to_sql</span><span class="p">(</span><span class="bp">self</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="o">-></span> <span class="nb">str</span><span class="p">:</span>
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</span><span id="preprocess-280"><a href="#preprocess-280"><span class="linenos">280</span></a> <span class="n">expression_type</span> <span class="o">=</span> <span class="nb">type</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
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</span><span id="preprocess-281"><a href="#preprocess-281"><span class="linenos">281</span></a>
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</span><span id="preprocess-282"><a href="#preprocess-282"><span class="linenos">282</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">transforms</span><span class="p">[</span><span class="mi">0</span><span class="p">](</span><span class="n">expression</span><span class="o">.</span><span class="n">copy</span><span class="p">())</span>
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</span><span id="preprocess-283"><a href="#preprocess-283"><span class="linenos">283</span></a> <span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="n">transforms</span><span class="p">[</span><span class="mi">1</span><span class="p">:]:</span>
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</span><span id="preprocess-284"><a href="#preprocess-284"><span class="linenos">284</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">t</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
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</span><span id="preprocess-285"><a href="#preprocess-285"><span class="linenos">285</span></a>
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</span><span id="preprocess-286"><a href="#preprocess-286"><span class="linenos">286</span></a> <span class="n">_sql_handler</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="o">.</span><span class="n">key</span> <span class="o">+</span> <span class="s2">"_sql"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
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</span><span id="preprocess-287"><a href="#preprocess-287"><span class="linenos">287</span></a> <span class="k">if</span> <span class="n">_sql_handler</span><span class="p">:</span>
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</span><span id="preprocess-288"><a href="#preprocess-288"><span class="linenos">288</span></a> <span class="k">return</span> <span class="n">_sql_handler</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
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</span><span id="preprocess-289"><a href="#preprocess-289"><span class="linenos">289</span></a>
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</span><span id="preprocess-290"><a href="#preprocess-290"><span class="linenos">290</span></a> <span class="n">transforms_handler</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">TRANSFORMS</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="nb">type</span><span class="p">(</span><span class="n">expression</span><span class="p">))</span>
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</span><span id="preprocess-291"><a href="#preprocess-291"><span class="linenos">291</span></a> <span class="k">if</span> <span class="n">transforms_handler</span><span class="p">:</span>
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</span><span id="preprocess-292"><a href="#preprocess-292"><span class="linenos">292</span></a> <span class="c1"># Ensures we don't enter an infinite loop. This can happen when the original expression</span>
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</span><span id="preprocess-293"><a href="#preprocess-293"><span class="linenos">293</span></a> <span class="c1"># has the same type as the final expression and there's no _sql method available for it,</span>
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</span><span id="preprocess-294"><a href="#preprocess-294"><span class="linenos">294</span></a> <span class="c1"># because then it'd re-enter _to_sql.</span>
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</span><span id="preprocess-295"><a href="#preprocess-295"><span class="linenos">295</span></a> <span class="k">if</span> <span class="n">expression_type</span> <span class="ow">is</span> <span class="nb">type</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
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</span><span id="preprocess-296"><a href="#preprocess-296"><span class="linenos">296</span></a> <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span>
|
|
</span><span id="preprocess-297"><a href="#preprocess-297"><span class="linenos">297</span></a> <span class="sa">f</span><span class="s2">"Expression type </span><span class="si">{</span><span class="n">expression</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span><span class="si">}</span><span class="s2"> requires a _sql method in order to be transformed."</span>
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</span><span id="preprocess-298"><a href="#preprocess-298"><span class="linenos">298</span></a> <span class="p">)</span>
|
|
</span><span id="preprocess-299"><a href="#preprocess-299"><span class="linenos">299</span></a>
|
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</span><span id="preprocess-300"><a href="#preprocess-300"><span class="linenos">300</span></a> <span class="k">return</span> <span class="n">transforms_handler</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="p">)</span>
|
|
</span><span id="preprocess-301"><a href="#preprocess-301"><span class="linenos">301</span></a>
|
|
</span><span id="preprocess-302"><a href="#preprocess-302"><span class="linenos">302</span></a> <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="sa">f</span><span class="s2">"Unsupported expression type </span><span class="si">{</span><span class="n">expression</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span><span class="si">}</span><span class="s2">."</span><span class="p">)</span>
|
|
</span><span id="preprocess-303"><a href="#preprocess-303"><span class="linenos">303</span></a>
|
|
</span><span id="preprocess-304"><a href="#preprocess-304"><span class="linenos">304</span></a> <span class="k">return</span> <span class="n">_to_sql</span>
|
|
</span></pre></div>
|
|
|
|
|
|
<div class="docstring"><p>Creates a new transform by chaining a sequence of transformations and converts the resulting
|
|
expression to SQL, using either the "_sql" method corresponding to the resulting expression,
|
|
or the appropriate <code>Generator.TRANSFORMS</code> function (when applicable -- see below).</p>
|
|
|
|
<h6 id="arguments">Arguments:</h6>
|
|
|
|
<ul>
|
|
<li><strong>transforms:</strong> sequence of transform functions. These will be called in order.</li>
|
|
</ul>
|
|
|
|
<h6 id="returns">Returns:</h6>
|
|
|
|
<blockquote>
|
|
<p>Function that can be used as a generator transform.</p>
|
|
</blockquote>
|
|
</div>
|
|
|
|
|
|
</section>
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|
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const term = getSearchTerm();
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}
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if (!search) {
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return "<h3>Searching...</h3>"
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}
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window.scrollTo({top: 0, left: 0, behavior: 'auto'});
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const results = search(term);
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|
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let html;
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if (results.length === 0) {
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|
html = `No search results for '${escapeHTML(term)}'.`
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} else {
|
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html = `<h4>${results.length} search result${results.length > 1 ? "s" : ""} for '${escapeHTML(term)}'.</h4>`;
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}
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for (let result of results.slice(0, 10)) {
|
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let doc = result.doc;
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let url = `../${doc.modulename.replaceAll(".", "/")}.html`;
|
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if (doc.qualname) {
|
|
url += `#${doc.qualname}`;
|
|
}
|
|
|
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let heading;
|
|
switch (result.doc.kind) {
|
|
case "function":
|
|
if (doc.fullname.endsWith(".__init__")) {
|
|
heading = `<span class="name">${doc.fullname.replace(/\.__init__$/, "")}</span>${doc.signature}`;
|
|
} else {
|
|
heading = `<span class="def">${doc.funcdef}</span> <span class="name">${doc.fullname}</span>${doc.signature}`;
|
|
}
|
|
break;
|
|
case "class":
|
|
heading = `<span class="def">class</span> <span class="name">${doc.fullname}</span>`;
|
|
if (doc.bases)
|
|
heading += `<wbr>(<span class="base">${doc.bases}</span>)`;
|
|
heading += `:`;
|
|
break;
|
|
case "variable":
|
|
heading = `<span class="name">${doc.fullname}</span>`;
|
|
if (doc.annotation)
|
|
heading += `<span class="annotation">${doc.annotation}</span>`;
|
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if (doc.default_value)
|
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heading += `<span class="default_value"> = ${doc.default_value}</span>`;
|
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break;
|
|
default:
|
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heading = `<span class="name">${doc.fullname}</span>`;
|
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break;
|
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}
|
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html += `
|
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<section class="search-result">
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<a href="${url}" class="attr ${doc.kind}">${heading}</a>
|
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<div class="docstring">${doc.doc}</div>
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</section>
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`;
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}
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return html;
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})());
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}
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if (getSearchTerm()) {
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initialize();
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&& focused.nextElementSibling
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block: "nearest",
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&& focused.previousElementSibling
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&& focused.previousElementSibling.classList.contains("search-result")
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