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Merging upstream version 20.9.0.

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Signed-off-by: Daniel Baumann <daniel@debian.org>
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Daniel Baumann 2025-02-13 21:19:14 +01:00
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4
docs/sqlglot/optimizer/merge_subqueries.html
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@ -3,7 +3,7 @@
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@ -585,7 +585,7 @@ queries if it would result in multiple table selects in a single query:</p>
<div class="attr variable">
<span class="name">UNMERGABLE_ARGS</span> =
<input id="UNMERGABLE_ARGS-view-value" class="view-value-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1">
<label class="view-value-button pdoc-button" for="UNMERGABLE_ARGS-view-value"></label><span class="default_value">{&#39;limit&#39;, &#39;sample&#39;, &#39;having&#39;, &#39;distinct&#39;, &#39;windows&#39;, &#39;match&#39;, &#39;connect&#39;, &#39;settings&#39;, &#39;cluster&#39;, &#39;with&#39;, &#39;format&#39;, &#39;offset&#39;, &#39;kind&#39;, &#39;laterals&#39;, &#39;into&#39;, &#39;sort&#39;, &#39;group&#39;, &#39;pivots&#39;, &#39;distribute&#39;, &#39;qualify&#39;, &#39;locks&#39;}</span>
<label class="view-value-button pdoc-button" for="UNMERGABLE_ARGS-view-value"></label><span class="default_value">{&#39;locks&#39;, &#39;into&#39;, &#39;sample&#39;, &#39;settings&#39;, &#39;pivots&#39;, &#39;distinct&#39;, &#39;cluster&#39;, &#39;connect&#39;, &#39;qualify&#39;, &#39;windows&#39;, &#39;sort&#39;, &#39;match&#39;, &#39;distribute&#39;, &#39;laterals&#39;, &#39;limit&#39;, &#39;with&#39;, &#39;offset&#39;, &#39;format&#39;, &#39;kind&#39;, &#39;having&#39;, &#39;group&#39;}</span>
</div>

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docs/sqlglot/optimizer/normalize.html
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2
docs/sqlglot/optimizer/normalize_identifiers.html
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2
docs/sqlglot/optimizer/optimize_joins.html
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@ -77,7 +77,7 @@
</span><span id="L-4"><a href="#L-4"><span class="linenos"> 4</span></a><span class="kn">from</span> <span class="nn">sqlglot.optimizer.simplify</span> <span class="kn">import</span> <span class="n">simplify</span>
</span><span id="L-5"><a href="#L-5"><span class="linenos"> 5</span></a>
</span><span id="L-6"><a href="#L-6"><span class="linenos"> 6</span></a>
</span><span id="L-7"><a href="#L-7"><span class="linenos"> 7</span></a><span class="k">def</span> <span class="nf">pushdown_predicates</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
</span><span id="L-7"><a href="#L-7"><span class="linenos"> 7</span></a><span class="k">def</span> <span class="nf">pushdown_predicates</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dialect</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
</span><span id="L-8"><a href="#L-8"><span class="linenos"> 8</span></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="L-9"><a href="#L-9"><span class="linenos"> 9</span></a><span class="sd"> Rewrite sqlglot AST to pushdown predicates in FROMS and JOINS</span>
</span><span id="L-10"><a href="#L-10"><span class="linenos"> 10</span></a>
@ -109,7 +109,7 @@
</span><span id="L-36"><a href="#L-36"><span class="linenos"> 36</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">parent</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">)</span> <span class="ow">and</span> <span class="n">parent</span><span class="o">.</span><span class="n">side</span> <span class="o">==</span> <span class="s2">&quot;RIGHT&quot;</span><span class="p">:</span>
</span><span id="L-37"><a href="#L-37"><span class="linenos"> 37</span></a> <span class="n">selected_sources</span> <span class="o">=</span> <span class="p">{</span><span class="n">k</span><span class="p">:</span> <span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">source</span><span class="p">)}</span>
</span><span id="L-38"><a href="#L-38"><span class="linenos"> 38</span></a> <span class="k">break</span>
</span><span id="L-39"><a href="#L-39"><span class="linenos"> 39</span></a> <span class="n">pushdown</span><span class="p">(</span><span class="n">where</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="n">selected_sources</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">)</span>
</span><span id="L-39"><a href="#L-39"><span class="linenos"> 39</span></a> <span class="n">pushdown</span><span class="p">(</span><span class="n">where</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="n">selected_sources</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">,</span> <span class="n">dialect</span><span class="p">)</span>
</span><span id="L-40"><a href="#L-40"><span class="linenos"> 40</span></a>
</span><span id="L-41"><a href="#L-41"><span class="linenos"> 41</span></a> <span class="c1"># joins should only pushdown into itself, not to other joins</span>
</span><span id="L-42"><a href="#L-42"><span class="linenos"> 42</span></a> <span class="c1"># so we limit the selected sources to only itself</span>
@ -117,170 +117,157 @@
</span><span id="L-44"><a href="#L-44"><span class="linenos"> 44</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">alias_or_name</span>
</span><span id="L-45"><a href="#L-45"><span class="linenos"> 45</span></a> <span class="k">if</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="p">:</span>
</span><span id="L-46"><a href="#L-46"><span class="linenos"> 46</span></a> <span class="n">pushdown</span><span class="p">(</span>
</span><span id="L-47"><a href="#L-47"><span class="linenos"> 47</span></a> <span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;on&quot;</span><span class="p">),</span> <span class="p">{</span><span class="n">name</span><span class="p">:</span> <span class="n">scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="p">[</span><span class="n">name</span><span class="p">]},</span> <span class="n">scope_ref_count</span>
</span><span id="L-48"><a href="#L-48"><span class="linenos"> 48</span></a> <span class="p">)</span>
</span><span id="L-49"><a href="#L-49"><span class="linenos"> 49</span></a>
</span><span id="L-50"><a href="#L-50"><span class="linenos"> 50</span></a> <span class="k">return</span> <span class="n">expression</span>
</span><span id="L-51"><a href="#L-51"><span class="linenos"> 51</span></a>
</span><span id="L-47"><a href="#L-47"><span class="linenos"> 47</span></a> <span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;on&quot;</span><span class="p">),</span>
</span><span id="L-48"><a href="#L-48"><span class="linenos"> 48</span></a> <span class="p">{</span><span class="n">name</span><span class="p">:</span> <span class="n">scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="p">[</span><span class="n">name</span><span class="p">]},</span>
</span><span id="L-49"><a href="#L-49"><span class="linenos"> 49</span></a> <span class="n">scope_ref_count</span><span class="p">,</span>
</span><span id="L-50"><a href="#L-50"><span class="linenos"> 50</span></a> <span class="n">dialect</span><span class="p">,</span>
</span><span id="L-51"><a href="#L-51"><span class="linenos"> 51</span></a> <span class="p">)</span>
</span><span id="L-52"><a href="#L-52"><span class="linenos"> 52</span></a>
</span><span id="L-53"><a href="#L-53"><span class="linenos"> 53</span></a><span class="k">def</span> <span class="nf">pushdown</span><span class="p">(</span><span class="n">condition</span><span class="p">,</span> <span class="n">sources</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">):</span>
</span><span id="L-54"><a href="#L-54"><span class="linenos"> 54</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">condition</span><span class="p">:</span>
</span><span id="L-55"><a href="#L-55"><span class="linenos"> 55</span></a> <span class="k">return</span>
</span><span id="L-56"><a href="#L-56"><span class="linenos"> 56</span></a>
</span><span id="L-57"><a href="#L-57"><span class="linenos"> 57</span></a> <span class="n">condition</span> <span class="o">=</span> <span class="n">condition</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">simplify</span><span class="p">(</span><span class="n">condition</span><span class="p">))</span>
</span><span id="L-58"><a href="#L-58"><span class="linenos"> 58</span></a> <span class="n">cnf_like</span> <span class="o">=</span> <span class="n">normalized</span><span class="p">(</span><span class="n">condition</span><span class="p">)</span> <span class="ow">or</span> <span class="ow">not</span> <span class="n">normalized</span><span class="p">(</span><span class="n">condition</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
</span><span id="L-53"><a href="#L-53"><span class="linenos"> 53</span></a> <span class="k">return</span> <span class="n">expression</span>
</span><span id="L-54"><a href="#L-54"><span class="linenos"> 54</span></a>
</span><span id="L-55"><a href="#L-55"><span class="linenos"> 55</span></a>
</span><span id="L-56"><a href="#L-56"><span class="linenos"> 56</span></a><span class="k">def</span> <span class="nf">pushdown</span><span class="p">(</span><span class="n">condition</span><span class="p">,</span> <span class="n">sources</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">,</span> <span class="n">dialect</span><span class="p">):</span>
</span><span id="L-57"><a href="#L-57"><span class="linenos"> 57</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">condition</span><span class="p">:</span>
</span><span id="L-58"><a href="#L-58"><span class="linenos"> 58</span></a> <span class="k">return</span>
</span><span id="L-59"><a href="#L-59"><span class="linenos"> 59</span></a>
</span><span id="L-60"><a href="#L-60"><span class="linenos"> 60</span></a> <span class="n">predicates</span> <span class="o">=</span> <span class="nb">list</span><span class="p">(</span>
</span><span id="L-61"><a href="#L-61"><span class="linenos"> 61</span></a> <span class="n">condition</span><span class="o">.</span><span class="n">flatten</span><span class="p">()</span>
</span><span id="L-62"><a href="#L-62"><span class="linenos"> 62</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">condition</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span> <span class="k">if</span> <span class="n">cnf_like</span> <span class="k">else</span> <span class="n">exp</span><span class="o">.</span><span class="n">Or</span><span class="p">)</span>
</span><span id="L-63"><a href="#L-63"><span class="linenos"> 63</span></a> <span class="k">else</span> <span class="p">[</span><span class="n">condition</span><span class="p">]</span>
</span><span id="L-64"><a href="#L-64"><span class="linenos"> 64</span></a> <span class="p">)</span>
</span><span id="L-65"><a href="#L-65"><span class="linenos"> 65</span></a>
</span><span id="L-66"><a href="#L-66"><span class="linenos"> 66</span></a> <span class="k">if</span> <span class="n">cnf_like</span><span class="p">:</span>
</span><span id="L-67"><a href="#L-67"><span class="linenos"> 67</span></a> <span class="n">pushdown_cnf</span><span class="p">(</span><span class="n">predicates</span><span class="p">,</span> <span class="n">sources</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">)</span>
</span><span id="L-68"><a href="#L-68"><span class="linenos"> 68</span></a> <span class="k">else</span><span class="p">:</span>
</span><span id="L-69"><a href="#L-69"><span class="linenos"> 69</span></a> <span class="n">pushdown_dnf</span><span class="p">(</span><span class="n">predicates</span><span class="p">,</span> <span class="n">sources</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">)</span>
</span><span id="L-70"><a href="#L-70"><span class="linenos"> 70</span></a>
</span><span id="L-71"><a href="#L-71"><span class="linenos"> 71</span></a>
</span><span id="L-72"><a href="#L-72"><span class="linenos"> 72</span></a><span class="k">def</span> <span class="nf">pushdown_cnf</span><span class="p">(</span><span class="n">predicates</span><span class="p">,</span> <span class="n">scope</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">):</span>
</span><span id="L-73"><a href="#L-73"><span class="linenos"> 73</span></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="L-74"><a href="#L-74"><span class="linenos"> 74</span></a><span class="sd"> If the predicates are in CNF like form, we can simply replace each block in the parent.</span>
</span><span id="L-75"><a href="#L-75"><span class="linenos"> 75</span></a><span class="sd"> &quot;&quot;&quot;</span>
</span><span id="L-76"><a href="#L-76"><span class="linenos"> 76</span></a> <span class="k">for</span> <span class="n">predicate</span> <span class="ow">in</span> <span class="n">predicates</span><span class="p">:</span>
</span><span id="L-77"><a href="#L-77"><span class="linenos"> 77</span></a> <span class="k">for</span> <span class="n">node</span> <span class="ow">in</span> <span class="n">nodes_for_predicate</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">scope</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">)</span><span class="o">.</span><span class="n">values</span><span class="p">():</span>
</span><span id="L-78"><a href="#L-78"><span class="linenos"> 78</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span>
</span><span id="L-79"><a href="#L-79"><span class="linenos"> 79</span></a> <span class="n">predicate</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
</span><span id="L-80"><a href="#L-80"><span class="linenos"> 80</span></a> <span class="n">node</span><span class="o">.</span><span class="n">on</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span><span id="L-81"><a href="#L-81"><span class="linenos"> 81</span></a> <span class="k">break</span>
</span><span id="L-82"><a href="#L-82"><span class="linenos"> 82</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">):</span>
</span><span id="L-83"><a href="#L-83"><span class="linenos"> 83</span></a> <span class="n">predicate</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
</span><span id="L-84"><a href="#L-84"><span class="linenos"> 84</span></a> <span class="n">inner_predicate</span> <span class="o">=</span> <span class="n">replace_aliases</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">predicate</span><span class="p">)</span>
</span><span id="L-85"><a href="#L-85"><span class="linenos"> 85</span></a> <span class="k">if</span> <span class="n">find_in_scope</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">AggFunc</span><span class="p">):</span>
</span><span id="L-86"><a href="#L-86"><span class="linenos"> 86</span></a> <span class="n">node</span><span class="o">.</span><span class="n">having</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span><span id="L-87"><a href="#L-87"><span class="linenos"> 87</span></a> <span class="k">else</span><span class="p">:</span>
</span><span id="L-88"><a href="#L-88"><span class="linenos"> 88</span></a> <span class="n">node</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span><span id="L-89"><a href="#L-89"><span class="linenos"> 89</span></a>
</span><span id="L-90"><a href="#L-90"><span class="linenos"> 90</span></a>
</span><span id="L-91"><a href="#L-91"><span class="linenos"> 91</span></a><span class="k">def</span> <span class="nf">pushdown_dnf</span><span class="p">(</span><span class="n">predicates</span><span class="p">,</span> <span class="n">scope</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">):</span>
</span><span id="L-92"><a href="#L-92"><span class="linenos"> 92</span></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="L-93"><a href="#L-93"><span class="linenos"> 93</span></a><span class="sd"> If the predicates are in DNF form, we can only push down conditions that are in all blocks.</span>
</span><span id="L-94"><a href="#L-94"><span class="linenos"> 94</span></a><span class="sd"> Additionally, we can&#39;t remove predicates from their original form.</span>
</span><span id="L-95"><a href="#L-95"><span class="linenos"> 95</span></a><span class="sd"> &quot;&quot;&quot;</span>
</span><span id="L-96"><a href="#L-96"><span class="linenos"> 96</span></a> <span class="c1"># find all the tables that can be pushdown too</span>
</span><span id="L-97"><a href="#L-97"><span class="linenos"> 97</span></a> <span class="c1"># these are tables that are referenced in all blocks of a DNF</span>
</span><span id="L-98"><a href="#L-98"><span class="linenos"> 98</span></a> <span class="c1"># (a.x AND b.x) OR (a.y AND c.y)</span>
</span><span id="L-99"><a href="#L-99"><span class="linenos"> 99</span></a> <span class="c1"># only table a can be push down</span>
</span><span id="L-100"><a href="#L-100"><span class="linenos">100</span></a> <span class="n">pushdown_tables</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>
</span><span id="L-101"><a href="#L-101"><span class="linenos">101</span></a>
</span><span id="L-102"><a href="#L-102"><span class="linenos">102</span></a> <span class="k">for</span> <span class="n">a</span> <span class="ow">in</span> <span class="n">predicates</span><span class="p">:</span>
</span><span id="L-103"><a href="#L-103"><span class="linenos">103</span></a> <span class="n">a_tables</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">a</span><span class="p">)</span>
</span><span id="L-60"><a href="#L-60"><span class="linenos"> 60</span></a> <span class="n">condition</span> <span class="o">=</span> <span class="n">condition</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">simplify</span><span class="p">(</span><span class="n">condition</span><span class="p">,</span> <span class="n">dialect</span><span class="o">=</span><span class="n">dialect</span><span class="p">))</span>
</span><span id="L-61"><a href="#L-61"><span class="linenos"> 61</span></a> <span class="n">cnf_like</span> <span class="o">=</span> <span class="n">normalized</span><span class="p">(</span><span class="n">condition</span><span class="p">)</span> <span class="ow">or</span> <span class="ow">not</span> <span class="n">normalized</span><span class="p">(</span><span class="n">condition</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
</span><span id="L-62"><a href="#L-62"><span class="linenos"> 62</span></a>
</span><span id="L-63"><a href="#L-63"><span class="linenos"> 63</span></a> <span class="n">predicates</span> <span class="o">=</span> <span class="nb">list</span><span class="p">(</span>
</span><span id="L-64"><a href="#L-64"><span class="linenos"> 64</span></a> <span class="n">condition</span><span class="o">.</span><span class="n">flatten</span><span class="p">()</span>
</span><span id="L-65"><a href="#L-65"><span class="linenos"> 65</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">condition</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span> <span class="k">if</span> <span class="n">cnf_like</span> <span class="k">else</span> <span class="n">exp</span><span class="o">.</span><span class="n">Or</span><span class="p">)</span>
</span><span id="L-66"><a href="#L-66"><span class="linenos"> 66</span></a> <span class="k">else</span> <span class="p">[</span><span class="n">condition</span><span class="p">]</span>
</span><span id="L-67"><a href="#L-67"><span class="linenos"> 67</span></a> <span class="p">)</span>
</span><span id="L-68"><a href="#L-68"><span class="linenos"> 68</span></a>
</span><span id="L-69"><a href="#L-69"><span class="linenos"> 69</span></a> <span class="k">if</span> <span class="n">cnf_like</span><span class="p">:</span>
</span><span id="L-70"><a href="#L-70"><span class="linenos"> 70</span></a> <span class="n">pushdown_cnf</span><span class="p">(</span><span class="n">predicates</span><span class="p">,</span> <span class="n">sources</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">)</span>
</span><span id="L-71"><a href="#L-71"><span class="linenos"> 71</span></a> <span class="k">else</span><span class="p">:</span>
</span><span id="L-72"><a href="#L-72"><span class="linenos"> 72</span></a> <span class="n">pushdown_dnf</span><span class="p">(</span><span class="n">predicates</span><span class="p">,</span> <span class="n">sources</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">)</span>
</span><span id="L-73"><a href="#L-73"><span class="linenos"> 73</span></a>
</span><span id="L-74"><a href="#L-74"><span class="linenos"> 74</span></a>
</span><span id="L-75"><a href="#L-75"><span class="linenos"> 75</span></a><span class="k">def</span> <span class="nf">pushdown_cnf</span><span class="p">(</span><span class="n">predicates</span><span class="p">,</span> <span class="n">scope</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">):</span>
</span><span id="L-76"><a href="#L-76"><span class="linenos"> 76</span></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="L-77"><a href="#L-77"><span class="linenos"> 77</span></a><span class="sd"> If the predicates are in CNF like form, we can simply replace each block in the parent.</span>
</span><span id="L-78"><a href="#L-78"><span class="linenos"> 78</span></a><span class="sd"> &quot;&quot;&quot;</span>
</span><span id="L-79"><a href="#L-79"><span class="linenos"> 79</span></a> <span class="k">for</span> <span class="n">predicate</span> <span class="ow">in</span> <span class="n">predicates</span><span class="p">:</span>
</span><span id="L-80"><a href="#L-80"><span class="linenos"> 80</span></a> <span class="k">for</span> <span class="n">node</span> <span class="ow">in</span> <span class="n">nodes_for_predicate</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">scope</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">)</span><span class="o">.</span><span class="n">values</span><span class="p">():</span>
</span><span id="L-81"><a href="#L-81"><span class="linenos"> 81</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span>
</span><span id="L-82"><a href="#L-82"><span class="linenos"> 82</span></a> <span class="n">predicate</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
</span><span id="L-83"><a href="#L-83"><span class="linenos"> 83</span></a> <span class="n">node</span><span class="o">.</span><span class="n">on</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span><span id="L-84"><a href="#L-84"><span class="linenos"> 84</span></a> <span class="k">break</span>
</span><span id="L-85"><a href="#L-85"><span class="linenos"> 85</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">):</span>
</span><span id="L-86"><a href="#L-86"><span class="linenos"> 86</span></a> <span class="n">predicate</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
</span><span id="L-87"><a href="#L-87"><span class="linenos"> 87</span></a> <span class="n">inner_predicate</span> <span class="o">=</span> <span class="n">replace_aliases</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">predicate</span><span class="p">)</span>
</span><span id="L-88"><a href="#L-88"><span class="linenos"> 88</span></a> <span class="k">if</span> <span class="n">find_in_scope</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">AggFunc</span><span class="p">):</span>
</span><span id="L-89"><a href="#L-89"><span class="linenos"> 89</span></a> <span class="n">node</span><span class="o">.</span><span class="n">having</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span><span id="L-90"><a href="#L-90"><span class="linenos"> 90</span></a> <span class="k">else</span><span class="p">:</span>
</span><span id="L-91"><a href="#L-91"><span class="linenos"> 91</span></a> <span class="n">node</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span><span id="L-92"><a href="#L-92"><span class="linenos"> 92</span></a>
</span><span id="L-93"><a href="#L-93"><span class="linenos"> 93</span></a>
</span><span id="L-94"><a href="#L-94"><span class="linenos"> 94</span></a><span class="k">def</span> <span class="nf">pushdown_dnf</span><span class="p">(</span><span class="n">predicates</span><span class="p">,</span> <span class="n">scope</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">):</span>
</span><span id="L-95"><a href="#L-95"><span class="linenos"> 95</span></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="L-96"><a href="#L-96"><span class="linenos"> 96</span></a><span class="sd"> If the predicates are in DNF form, we can only push down conditions that are in all blocks.</span>
</span><span id="L-97"><a href="#L-97"><span class="linenos"> 97</span></a><span class="sd"> Additionally, we can&#39;t remove predicates from their original form.</span>
</span><span id="L-98"><a href="#L-98"><span class="linenos"> 98</span></a><span class="sd"> &quot;&quot;&quot;</span>
</span><span id="L-99"><a href="#L-99"><span class="linenos"> 99</span></a> <span class="c1"># find all the tables that can be pushdown too</span>
</span><span id="L-100"><a href="#L-100"><span class="linenos">100</span></a> <span class="c1"># these are tables that are referenced in all blocks of a DNF</span>
</span><span id="L-101"><a href="#L-101"><span class="linenos">101</span></a> <span class="c1"># (a.x AND b.x) OR (a.y AND c.y)</span>
</span><span id="L-102"><a href="#L-102"><span class="linenos">102</span></a> <span class="c1"># only table a can be push down</span>
</span><span id="L-103"><a href="#L-103"><span class="linenos">103</span></a> <span class="n">pushdown_tables</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>
</span><span id="L-104"><a href="#L-104"><span class="linenos">104</span></a>
</span><span id="L-105"><a href="#L-105"><span class="linenos">105</span></a> <span class="k">for</span> <span class="n">b</span> <span class="ow">in</span> <span class="n">predicates</span><span class="p">:</span>
</span><span id="L-106"><a href="#L-106"><span class="linenos">106</span></a> <span class="n">a_tables</span> <span class="o">&amp;=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">b</span><span class="p">)</span>
</span><span id="L-105"><a href="#L-105"><span class="linenos">105</span></a> <span class="k">for</span> <span class="n">a</span> <span class="ow">in</span> <span class="n">predicates</span><span class="p">:</span>
</span><span id="L-106"><a href="#L-106"><span class="linenos">106</span></a> <span class="n">a_tables</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">a</span><span class="p">)</span>
</span><span id="L-107"><a href="#L-107"><span class="linenos">107</span></a>
</span><span id="L-108"><a href="#L-108"><span class="linenos">108</span></a> <span class="n">pushdown_tables</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">a_tables</span><span class="p">)</span>
</span><span id="L-109"><a href="#L-109"><span class="linenos">109</span></a>
</span><span id="L-110"><a href="#L-110"><span class="linenos">110</span></a> <span class="n">conditions</span> <span class="o">=</span> <span class="p">{}</span>
</span><span id="L-111"><a href="#L-111"><span class="linenos">111</span></a>
</span><span id="L-112"><a href="#L-112"><span class="linenos">112</span></a> <span class="c1"># for every pushdown table, find all related conditions in all predicates</span>
</span><span id="L-113"><a href="#L-113"><span class="linenos">113</span></a> <span class="c1"># combine them with ORS</span>
</span><span id="L-114"><a href="#L-114"><span class="linenos">114</span></a> <span class="c1"># (a.x AND and a.y AND b.x) OR (a.z AND c.y) -&gt; (a.x AND a.y) OR (a.z)</span>
</span><span id="L-115"><a href="#L-115"><span class="linenos">115</span></a> <span class="k">for</span> <span class="n">table</span> <span class="ow">in</span> <span class="nb">sorted</span><span class="p">(</span><span class="n">pushdown_tables</span><span class="p">):</span>
</span><span id="L-116"><a href="#L-116"><span class="linenos">116</span></a> <span class="k">for</span> <span class="n">predicate</span> <span class="ow">in</span> <span class="n">predicates</span><span class="p">:</span>
</span><span id="L-117"><a href="#L-117"><span class="linenos">117</span></a> <span class="n">nodes</span> <span class="o">=</span> <span class="n">nodes_for_predicate</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">scope</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">)</span>
</span><span id="L-118"><a href="#L-118"><span class="linenos">118</span></a>
</span><span id="L-119"><a href="#L-119"><span class="linenos">119</span></a> <span class="k">if</span> <span class="n">table</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">nodes</span><span class="p">:</span>
</span><span id="L-120"><a href="#L-120"><span class="linenos">120</span></a> <span class="k">continue</span>
</span><span id="L-121"><a href="#L-121"><span class="linenos">121</span></a>
</span><span id="L-122"><a href="#L-122"><span class="linenos">122</span></a> <span class="n">predicate_condition</span> <span class="o">=</span> <span class="kc">None</span>
</span><span id="L-123"><a href="#L-123"><span class="linenos">123</span></a>
</span><span id="L-124"><a href="#L-124"><span class="linenos">124</span></a> <span class="k">for</span> <span class="n">column</span> <span class="ow">in</span> <span class="n">predicate</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">):</span>
</span><span id="L-125"><a href="#L-125"><span class="linenos">125</span></a> <span class="k">if</span> <span class="n">column</span><span class="o">.</span><span class="n">table</span> <span class="o">==</span> <span class="n">table</span><span class="p">:</span>
</span><span id="L-126"><a href="#L-126"><span class="linenos">126</span></a> <span class="n">condition</span> <span class="o">=</span> <span class="n">column</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Condition</span><span class="p">)</span>
</span><span id="L-127"><a href="#L-127"><span class="linenos">127</span></a> <span class="n">predicate_condition</span> <span class="o">=</span> <span class="p">(</span>
</span><span id="L-128"><a href="#L-128"><span class="linenos">128</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">and_</span><span class="p">(</span><span class="n">predicate_condition</span><span class="p">,</span> <span class="n">condition</span><span class="p">)</span>
</span><span id="L-129"><a href="#L-129"><span class="linenos">129</span></a> <span class="k">if</span> <span class="n">predicate_condition</span>
</span><span id="L-130"><a href="#L-130"><span class="linenos">130</span></a> <span class="k">else</span> <span class="n">condition</span>
</span><span id="L-131"><a href="#L-131"><span class="linenos">131</span></a> <span class="p">)</span>
</span><span id="L-108"><a href="#L-108"><span class="linenos">108</span></a> <span class="k">for</span> <span class="n">b</span> <span class="ow">in</span> <span class="n">predicates</span><span class="p">:</span>
</span><span id="L-109"><a href="#L-109"><span class="linenos">109</span></a> <span class="n">a_tables</span> <span class="o">&amp;=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">b</span><span class="p">)</span>
</span><span id="L-110"><a href="#L-110"><span class="linenos">110</span></a>
</span><span id="L-111"><a href="#L-111"><span class="linenos">111</span></a> <span class="n">pushdown_tables</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">a_tables</span><span class="p">)</span>
</span><span id="L-112"><a href="#L-112"><span class="linenos">112</span></a>
</span><span id="L-113"><a href="#L-113"><span class="linenos">113</span></a> <span class="n">conditions</span> <span class="o">=</span> <span class="p">{}</span>
</span><span id="L-114"><a href="#L-114"><span class="linenos">114</span></a>
</span><span id="L-115"><a href="#L-115"><span class="linenos">115</span></a> <span class="c1"># pushdown all predicates to their respective nodes</span>
</span><span id="L-116"><a href="#L-116"><span class="linenos">116</span></a> <span class="k">for</span> <span class="n">table</span> <span class="ow">in</span> <span class="nb">sorted</span><span class="p">(</span><span class="n">pushdown_tables</span><span class="p">):</span>
</span><span id="L-117"><a href="#L-117"><span class="linenos">117</span></a> <span class="k">for</span> <span class="n">predicate</span> <span class="ow">in</span> <span class="n">predicates</span><span class="p">:</span>
</span><span id="L-118"><a href="#L-118"><span class="linenos">118</span></a> <span class="n">nodes</span> <span class="o">=</span> <span class="n">nodes_for_predicate</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">scope</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">)</span>
</span><span id="L-119"><a href="#L-119"><span class="linenos">119</span></a>
</span><span id="L-120"><a href="#L-120"><span class="linenos">120</span></a> <span class="k">if</span> <span class="n">table</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">nodes</span><span class="p">:</span>
</span><span id="L-121"><a href="#L-121"><span class="linenos">121</span></a> <span class="k">continue</span>
</span><span id="L-122"><a href="#L-122"><span class="linenos">122</span></a>
</span><span id="L-123"><a href="#L-123"><span class="linenos">123</span></a> <span class="n">conditions</span><span class="p">[</span><span class="n">table</span><span class="p">]</span> <span class="o">=</span> <span class="p">(</span>
</span><span id="L-124"><a href="#L-124"><span class="linenos">124</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">or_</span><span class="p">(</span><span class="n">conditions</span><span class="p">[</span><span class="n">table</span><span class="p">],</span> <span class="n">predicate</span><span class="p">)</span> <span class="k">if</span> <span class="n">table</span> <span class="ow">in</span> <span class="n">conditions</span> <span class="k">else</span> <span class="n">predicate</span>
</span><span id="L-125"><a href="#L-125"><span class="linenos">125</span></a> <span class="p">)</span>
</span><span id="L-126"><a href="#L-126"><span class="linenos">126</span></a>
</span><span id="L-127"><a href="#L-127"><span class="linenos">127</span></a> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">node</span> <span class="ow">in</span> <span class="n">nodes</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
</span><span id="L-128"><a href="#L-128"><span class="linenos">128</span></a> <span class="k">if</span> <span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">conditions</span><span class="p">:</span>
</span><span id="L-129"><a href="#L-129"><span class="linenos">129</span></a> <span class="k">continue</span>
</span><span id="L-130"><a href="#L-130"><span class="linenos">130</span></a>
</span><span id="L-131"><a href="#L-131"><span class="linenos">131</span></a> <span class="n">predicate</span> <span class="o">=</span> <span class="n">conditions</span><span class="p">[</span><span class="n">name</span><span class="p">]</span>
</span><span id="L-132"><a href="#L-132"><span class="linenos">132</span></a>
</span><span id="L-133"><a href="#L-133"><span class="linenos">133</span></a> <span class="k">if</span> <span class="n">predicate_condition</span><span class="p">:</span>
</span><span id="L-134"><a href="#L-134"><span class="linenos">134</span></a> <span class="n">conditions</span><span class="p">[</span><span class="n">table</span><span class="p">]</span> <span class="o">=</span> <span class="p">(</span>
</span><span id="L-135"><a href="#L-135"><span class="linenos">135</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">or_</span><span class="p">(</span><span class="n">conditions</span><span class="p">[</span><span class="n">table</span><span class="p">],</span> <span class="n">predicate_condition</span><span class="p">)</span>
</span><span id="L-136"><a href="#L-136"><span class="linenos">136</span></a> <span class="k">if</span> <span class="n">table</span> <span class="ow">in</span> <span class="n">conditions</span>
</span><span id="L-137"><a href="#L-137"><span class="linenos">137</span></a> <span class="k">else</span> <span class="n">predicate_condition</span>
</span><span id="L-138"><a href="#L-138"><span class="linenos">138</span></a> <span class="p">)</span>
</span><span id="L-139"><a href="#L-139"><span class="linenos">139</span></a>
</span><span id="L-140"><a href="#L-140"><span class="linenos">140</span></a> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">node</span> <span class="ow">in</span> <span class="n">nodes</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
</span><span id="L-141"><a href="#L-141"><span class="linenos">141</span></a> <span class="k">if</span> <span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">conditions</span><span class="p">:</span>
</span><span id="L-142"><a href="#L-142"><span class="linenos">142</span></a> <span class="k">continue</span>
</span><span id="L-143"><a href="#L-143"><span class="linenos">143</span></a>
</span><span id="L-144"><a href="#L-144"><span class="linenos">144</span></a> <span class="n">predicate</span> <span class="o">=</span> <span class="n">conditions</span><span class="p">[</span><span class="n">name</span><span class="p">]</span>
</span><span id="L-145"><a href="#L-145"><span class="linenos">145</span></a>
</span><span id="L-146"><a href="#L-146"><span class="linenos">146</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span>
</span><span id="L-147"><a href="#L-147"><span class="linenos">147</span></a> <span class="n">node</span><span class="o">.</span><span class="n">on</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span><span id="L-148"><a href="#L-148"><span class="linenos">148</span></a> <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">):</span>
</span><span id="L-149"><a href="#L-149"><span class="linenos">149</span></a> <span class="n">inner_predicate</span> <span class="o">=</span> <span class="n">replace_aliases</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">predicate</span><span class="p">)</span>
</span><span id="L-150"><a href="#L-150"><span class="linenos">150</span></a> <span class="k">if</span> <span class="n">find_in_scope</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">AggFunc</span><span class="p">):</span>
</span><span id="L-151"><a href="#L-151"><span class="linenos">151</span></a> <span class="n">node</span><span class="o">.</span><span class="n">having</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span><span id="L-152"><a href="#L-152"><span class="linenos">152</span></a> <span class="k">else</span><span class="p">:</span>
</span><span id="L-153"><a href="#L-153"><span class="linenos">153</span></a> <span class="n">node</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span><span id="L-154"><a href="#L-154"><span class="linenos">154</span></a>
</span><span id="L-133"><a href="#L-133"><span class="linenos">133</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span>
</span><span id="L-134"><a href="#L-134"><span class="linenos">134</span></a> <span class="n">node</span><span class="o">.</span><span class="n">on</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span><span id="L-135"><a href="#L-135"><span class="linenos">135</span></a> <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">):</span>
</span><span id="L-136"><a href="#L-136"><span class="linenos">136</span></a> <span class="n">inner_predicate</span> <span class="o">=</span> <span class="n">replace_aliases</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">predicate</span><span class="p">)</span>
</span><span id="L-137"><a href="#L-137"><span class="linenos">137</span></a> <span class="k">if</span> <span class="n">find_in_scope</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">AggFunc</span><span class="p">):</span>
</span><span id="L-138"><a href="#L-138"><span class="linenos">138</span></a> <span class="n">node</span><span class="o">.</span><span class="n">having</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span><span id="L-139"><a href="#L-139"><span class="linenos">139</span></a> <span class="k">else</span><span class="p">:</span>
</span><span id="L-140"><a href="#L-140"><span class="linenos">140</span></a> <span class="n">node</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span><span id="L-141"><a href="#L-141"><span class="linenos">141</span></a>
</span><span id="L-142"><a href="#L-142"><span class="linenos">142</span></a>
</span><span id="L-143"><a href="#L-143"><span class="linenos">143</span></a><span class="k">def</span> <span class="nf">nodes_for_predicate</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">sources</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">):</span>
</span><span id="L-144"><a href="#L-144"><span class="linenos">144</span></a> <span class="n">nodes</span> <span class="o">=</span> <span class="p">{}</span>
</span><span id="L-145"><a href="#L-145"><span class="linenos">145</span></a> <span class="n">tables</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">predicate</span><span class="p">)</span>
</span><span id="L-146"><a href="#L-146"><span class="linenos">146</span></a> <span class="n">where_condition</span> <span class="o">=</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">predicate</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Where</span><span class="p">),</span> <span class="n">exp</span><span class="o">.</span><span class="n">Where</span><span class="p">)</span>
</span><span id="L-147"><a href="#L-147"><span class="linenos">147</span></a>
</span><span id="L-148"><a href="#L-148"><span class="linenos">148</span></a> <span class="k">for</span> <span class="n">table</span> <span class="ow">in</span> <span class="nb">sorted</span><span class="p">(</span><span class="n">tables</span><span class="p">):</span>
</span><span id="L-149"><a href="#L-149"><span class="linenos">149</span></a> <span class="n">node</span><span class="p">,</span> <span class="n">source</span> <span class="o">=</span> <span class="n">sources</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">table</span><span class="p">)</span> <span class="ow">or</span> <span class="p">(</span><span class="kc">None</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
</span><span id="L-150"><a href="#L-150"><span class="linenos">150</span></a>
</span><span id="L-151"><a href="#L-151"><span class="linenos">151</span></a> <span class="c1"># if the predicate is in a where statement we can try to push it down</span>
</span><span id="L-152"><a href="#L-152"><span class="linenos">152</span></a> <span class="c1"># we want to find the root join or from statement</span>
</span><span id="L-153"><a href="#L-153"><span class="linenos">153</span></a> <span class="k">if</span> <span class="n">node</span> <span class="ow">and</span> <span class="n">where_condition</span><span class="p">:</span>
</span><span id="L-154"><a href="#L-154"><span class="linenos">154</span></a> <span class="n">node</span> <span class="o">=</span> <span class="n">node</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">)</span>
</span><span id="L-155"><a href="#L-155"><span class="linenos">155</span></a>
</span><span id="L-156"><a href="#L-156"><span class="linenos">156</span></a><span class="k">def</span> <span class="nf">nodes_for_predicate</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">sources</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">):</span>
</span><span id="L-157"><a href="#L-157"><span class="linenos">157</span></a> <span class="n">nodes</span> <span class="o">=</span> <span class="p">{}</span>
</span><span id="L-158"><a href="#L-158"><span class="linenos">158</span></a> <span class="n">tables</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">predicate</span><span class="p">)</span>
</span><span id="L-159"><a href="#L-159"><span class="linenos">159</span></a> <span class="n">where_condition</span> <span class="o">=</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">predicate</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Where</span><span class="p">),</span> <span class="n">exp</span><span class="o">.</span><span class="n">Where</span><span class="p">)</span>
</span><span id="L-160"><a href="#L-160"><span class="linenos">160</span></a>
</span><span id="L-161"><a href="#L-161"><span class="linenos">161</span></a> <span class="k">for</span> <span class="n">table</span> <span class="ow">in</span> <span class="nb">sorted</span><span class="p">(</span><span class="n">tables</span><span class="p">):</span>
</span><span id="L-162"><a href="#L-162"><span class="linenos">162</span></a> <span class="n">node</span><span class="p">,</span> <span class="n">source</span> <span class="o">=</span> <span class="n">sources</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">table</span><span class="p">)</span> <span class="ow">or</span> <span class="p">(</span><span class="kc">None</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
</span><span id="L-163"><a href="#L-163"><span class="linenos">163</span></a>
</span><span id="L-164"><a href="#L-164"><span class="linenos">164</span></a> <span class="c1"># if the predicate is in a where statement we can try to push it down</span>
</span><span id="L-165"><a href="#L-165"><span class="linenos">165</span></a> <span class="c1"># we want to find the root join or from statement</span>
</span><span id="L-166"><a href="#L-166"><span class="linenos">166</span></a> <span class="k">if</span> <span class="n">node</span> <span class="ow">and</span> <span class="n">where_condition</span><span class="p">:</span>
</span><span id="L-167"><a href="#L-167"><span class="linenos">167</span></a> <span class="n">node</span> <span class="o">=</span> <span class="n">node</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">)</span>
</span><span id="L-168"><a href="#L-168"><span class="linenos">168</span></a>
</span><span id="L-169"><a href="#L-169"><span class="linenos">169</span></a> <span class="c1"># a node can reference a CTE which should be pushed down</span>
</span><span id="L-170"><a href="#L-170"><span class="linenos">170</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">)</span> <span class="ow">and</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Table</span><span class="p">):</span>
</span><span id="L-171"><a href="#L-171"><span class="linenos">171</span></a> <span class="n">with_</span> <span class="o">=</span> <span class="n">source</span><span class="o">.</span><span class="n">parent</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">&quot;with&quot;</span><span class="p">)</span>
</span><span id="L-172"><a href="#L-172"><span class="linenos">172</span></a> <span class="k">if</span> <span class="n">with_</span> <span class="ow">and</span> <span class="n">with_</span><span class="o">.</span><span class="n">recursive</span><span class="p">:</span>
</span><span id="L-173"><a href="#L-173"><span class="linenos">173</span></a> <span class="k">return</span> <span class="p">{}</span>
</span><span id="L-174"><a href="#L-174"><span class="linenos">174</span></a> <span class="n">node</span> <span class="o">=</span> <span class="n">source</span><span class="o">.</span><span class="n">expression</span>
</span><span id="L-175"><a href="#L-175"><span class="linenos">175</span></a>
</span><span id="L-176"><a href="#L-176"><span class="linenos">176</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span>
</span><span id="L-177"><a href="#L-177"><span class="linenos">177</span></a> <span class="k">if</span> <span class="n">node</span><span class="o">.</span><span class="n">side</span> <span class="ow">and</span> <span class="n">node</span><span class="o">.</span><span class="n">side</span> <span class="o">!=</span> <span class="s2">&quot;RIGHT&quot;</span><span class="p">:</span>
</span><span id="L-178"><a href="#L-178"><span class="linenos">178</span></a> <span class="k">return</span> <span class="p">{}</span>
</span><span id="L-179"><a href="#L-179"><span class="linenos">179</span></a> <span class="n">nodes</span><span class="p">[</span><span class="n">table</span><span class="p">]</span> <span class="o">=</span> <span class="n">node</span>
</span><span id="L-180"><a href="#L-180"><span class="linenos">180</span></a> <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">len</span><span class="p">(</span><span class="n">tables</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
</span><span id="L-181"><a href="#L-181"><span class="linenos">181</span></a> <span class="c1"># We can&#39;t push down window expressions</span>
</span><span id="L-182"><a href="#L-182"><span class="linenos">182</span></a> <span class="n">has_window_expression</span> <span class="o">=</span> <span class="nb">any</span><span class="p">(</span>
</span><span id="L-183"><a href="#L-183"><span class="linenos">183</span></a> <span class="n">select</span> <span class="k">for</span> <span class="n">select</span> <span class="ow">in</span> <span class="n">node</span><span class="o">.</span><span class="n">selects</span> <span class="k">if</span> <span class="n">select</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">Window</span><span class="p">)</span>
</span><span id="L-184"><a href="#L-184"><span class="linenos">184</span></a> <span class="p">)</span>
</span><span id="L-185"><a href="#L-185"><span class="linenos">185</span></a> <span class="c1"># we can&#39;t push down predicates to select statements if they are referenced in</span>
</span><span id="L-186"><a href="#L-186"><span class="linenos">186</span></a> <span class="c1"># multiple places.</span>
</span><span id="L-187"><a href="#L-187"><span class="linenos">187</span></a> <span class="k">if</span> <span class="p">(</span>
</span><span id="L-188"><a href="#L-188"><span class="linenos">188</span></a> <span class="ow">not</span> <span class="n">node</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">&quot;group&quot;</span><span class="p">)</span>
</span><span id="L-189"><a href="#L-189"><span class="linenos">189</span></a> <span class="ow">and</span> <span class="n">scope_ref_count</span><span class="p">[</span><span class="nb">id</span><span class="p">(</span><span class="n">source</span><span class="p">)]</span> <span class="o">&lt;</span> <span class="mi">2</span>
</span><span id="L-190"><a href="#L-190"><span class="linenos">190</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="n">has_window_expression</span>
</span><span id="L-191"><a href="#L-191"><span class="linenos">191</span></a> <span class="p">):</span>
</span><span id="L-192"><a href="#L-192"><span class="linenos">192</span></a> <span class="n">nodes</span><span class="p">[</span><span class="n">table</span><span class="p">]</span> <span class="o">=</span> <span class="n">node</span>
</span><span id="L-193"><a href="#L-193"><span class="linenos">193</span></a> <span class="k">return</span> <span class="n">nodes</span>
</span><span id="L-194"><a href="#L-194"><span class="linenos">194</span></a>
</span><span id="L-195"><a href="#L-195"><span class="linenos">195</span></a>
</span><span id="L-196"><a href="#L-196"><span class="linenos">196</span></a><span class="k">def</span> <span class="nf">replace_aliases</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">predicate</span><span class="p">):</span>
</span><span id="L-197"><a href="#L-197"><span class="linenos">197</span></a> <span class="n">aliases</span> <span class="o">=</span> <span class="p">{}</span>
</span><span id="L-198"><a href="#L-198"><span class="linenos">198</span></a>
</span><span id="L-199"><a href="#L-199"><span class="linenos">199</span></a> <span class="k">for</span> <span class="n">select</span> <span class="ow">in</span> <span class="n">source</span><span class="o">.</span><span class="n">selects</span><span class="p">:</span>
</span><span id="L-200"><a href="#L-200"><span class="linenos">200</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>
</span><span id="L-201"><a href="#L-201"><span class="linenos">201</span></a> <span class="n">aliases</span><span class="p">[</span><span class="n">select</span><span class="o">.</span><span class="n">alias</span><span class="p">]</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">this</span>
</span><span id="L-202"><a href="#L-202"><span class="linenos">202</span></a> <span class="k">else</span><span class="p">:</span>
</span><span id="L-203"><a href="#L-203"><span class="linenos">203</span></a> <span class="n">aliases</span><span class="p">[</span><span class="n">select</span><span class="o">.</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">select</span>
</span><span id="L-204"><a href="#L-204"><span class="linenos">204</span></a>
</span><span id="L-205"><a href="#L-205"><span class="linenos">205</span></a> <span class="k">def</span> <span class="nf">_replace_alias</span><span class="p">(</span><span class="n">column</span><span class="p">):</span>
</span><span id="L-206"><a href="#L-206"><span class="linenos">206</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">column</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="ow">and</span> <span class="n">column</span><span class="o">.</span><span class="n">name</span> <span class="ow">in</span> <span class="n">aliases</span><span class="p">:</span>
</span><span id="L-207"><a href="#L-207"><span class="linenos">207</span></a> <span class="k">return</span> <span class="n">aliases</span><span class="p">[</span><span class="n">column</span><span class="o">.</span><span class="n">name</span><span class="p">]</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span>
</span><span id="L-208"><a href="#L-208"><span class="linenos">208</span></a> <span class="k">return</span> <span class="n">column</span>
</span><span id="L-209"><a href="#L-209"><span class="linenos">209</span></a>
</span><span id="L-210"><a href="#L-210"><span class="linenos">210</span></a> <span class="k">return</span> <span class="n">predicate</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span><span class="n">_replace_alias</span><span class="p">)</span>
</span><span id="L-156"><a href="#L-156"><span class="linenos">156</span></a> <span class="c1"># a node can reference a CTE which should be pushed down</span>
</span><span id="L-157"><a href="#L-157"><span class="linenos">157</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">)</span> <span class="ow">and</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Table</span><span class="p">):</span>
</span><span id="L-158"><a href="#L-158"><span class="linenos">158</span></a> <span class="n">with_</span> <span class="o">=</span> <span class="n">source</span><span class="o">.</span><span class="n">parent</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">&quot;with&quot;</span><span class="p">)</span>
</span><span id="L-159"><a href="#L-159"><span class="linenos">159</span></a> <span class="k">if</span> <span class="n">with_</span> <span class="ow">and</span> <span class="n">with_</span><span class="o">.</span><span class="n">recursive</span><span class="p">:</span>
</span><span id="L-160"><a href="#L-160"><span class="linenos">160</span></a> <span class="k">return</span> <span class="p">{}</span>
</span><span id="L-161"><a href="#L-161"><span class="linenos">161</span></a> <span class="n">node</span> <span class="o">=</span> <span class="n">source</span><span class="o">.</span><span class="n">expression</span>
</span><span id="L-162"><a href="#L-162"><span class="linenos">162</span></a>
</span><span id="L-163"><a href="#L-163"><span class="linenos">163</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span>
</span><span id="L-164"><a href="#L-164"><span class="linenos">164</span></a> <span class="k">if</span> <span class="n">node</span><span class="o">.</span><span class="n">side</span> <span class="ow">and</span> <span class="n">node</span><span class="o">.</span><span class="n">side</span> <span class="o">!=</span> <span class="s2">&quot;RIGHT&quot;</span><span class="p">:</span>
</span><span id="L-165"><a href="#L-165"><span class="linenos">165</span></a> <span class="k">return</span> <span class="p">{}</span>
</span><span id="L-166"><a href="#L-166"><span class="linenos">166</span></a> <span class="n">nodes</span><span class="p">[</span><span class="n">table</span><span class="p">]</span> <span class="o">=</span> <span class="n">node</span>
</span><span id="L-167"><a href="#L-167"><span class="linenos">167</span></a> <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">len</span><span class="p">(</span><span class="n">tables</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
</span><span id="L-168"><a href="#L-168"><span class="linenos">168</span></a> <span class="c1"># We can&#39;t push down window expressions</span>
</span><span id="L-169"><a href="#L-169"><span class="linenos">169</span></a> <span class="n">has_window_expression</span> <span class="o">=</span> <span class="nb">any</span><span class="p">(</span>
</span><span id="L-170"><a href="#L-170"><span class="linenos">170</span></a> <span class="n">select</span> <span class="k">for</span> <span class="n">select</span> <span class="ow">in</span> <span class="n">node</span><span class="o">.</span><span class="n">selects</span> <span class="k">if</span> <span class="n">select</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">Window</span><span class="p">)</span>
</span><span id="L-171"><a href="#L-171"><span class="linenos">171</span></a> <span class="p">)</span>
</span><span id="L-172"><a href="#L-172"><span class="linenos">172</span></a> <span class="c1"># we can&#39;t push down predicates to select statements if they are referenced in</span>
</span><span id="L-173"><a href="#L-173"><span class="linenos">173</span></a> <span class="c1"># multiple places.</span>
</span><span id="L-174"><a href="#L-174"><span class="linenos">174</span></a> <span class="k">if</span> <span class="p">(</span>
</span><span id="L-175"><a href="#L-175"><span class="linenos">175</span></a> <span class="ow">not</span> <span class="n">node</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">&quot;group&quot;</span><span class="p">)</span>
</span><span id="L-176"><a href="#L-176"><span class="linenos">176</span></a> <span class="ow">and</span> <span class="n">scope_ref_count</span><span class="p">[</span><span class="nb">id</span><span class="p">(</span><span class="n">source</span><span class="p">)]</span> <span class="o">&lt;</span> <span class="mi">2</span>
</span><span id="L-177"><a href="#L-177"><span class="linenos">177</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="n">has_window_expression</span>
</span><span id="L-178"><a href="#L-178"><span class="linenos">178</span></a> <span class="p">):</span>
</span><span id="L-179"><a href="#L-179"><span class="linenos">179</span></a> <span class="n">nodes</span><span class="p">[</span><span class="n">table</span><span class="p">]</span> <span class="o">=</span> <span class="n">node</span>
</span><span id="L-180"><a href="#L-180"><span class="linenos">180</span></a> <span class="k">return</span> <span class="n">nodes</span>
</span><span id="L-181"><a href="#L-181"><span class="linenos">181</span></a>
</span><span id="L-182"><a href="#L-182"><span class="linenos">182</span></a>
</span><span id="L-183"><a href="#L-183"><span class="linenos">183</span></a><span class="k">def</span> <span class="nf">replace_aliases</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">predicate</span><span class="p">):</span>
</span><span id="L-184"><a href="#L-184"><span class="linenos">184</span></a> <span class="n">aliases</span> <span class="o">=</span> <span class="p">{}</span>
</span><span id="L-185"><a href="#L-185"><span class="linenos">185</span></a>
</span><span id="L-186"><a href="#L-186"><span class="linenos">186</span></a> <span class="k">for</span> <span class="n">select</span> <span class="ow">in</span> <span class="n">source</span><span class="o">.</span><span class="n">selects</span><span class="p">:</span>
</span><span id="L-187"><a href="#L-187"><span class="linenos">187</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>
</span><span id="L-188"><a href="#L-188"><span class="linenos">188</span></a> <span class="n">aliases</span><span class="p">[</span><span class="n">select</span><span class="o">.</span><span class="n">alias</span><span class="p">]</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">this</span>
</span><span id="L-189"><a href="#L-189"><span class="linenos">189</span></a> <span class="k">else</span><span class="p">:</span>
</span><span id="L-190"><a href="#L-190"><span class="linenos">190</span></a> <span class="n">aliases</span><span class="p">[</span><span class="n">select</span><span class="o">.</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">select</span>
</span><span id="L-191"><a href="#L-191"><span class="linenos">191</span></a>
</span><span id="L-192"><a href="#L-192"><span class="linenos">192</span></a> <span class="k">def</span> <span class="nf">_replace_alias</span><span class="p">(</span><span class="n">column</span><span class="p">):</span>
</span><span id="L-193"><a href="#L-193"><span class="linenos">193</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">column</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="ow">and</span> <span class="n">column</span><span class="o">.</span><span class="n">name</span> <span class="ow">in</span> <span class="n">aliases</span><span class="p">:</span>
</span><span id="L-194"><a href="#L-194"><span class="linenos">194</span></a> <span class="k">return</span> <span class="n">aliases</span><span class="p">[</span><span class="n">column</span><span class="o">.</span><span class="n">name</span><span class="p">]</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span>
</span><span id="L-195"><a href="#L-195"><span class="linenos">195</span></a> <span class="k">return</span> <span class="n">column</span>
</span><span id="L-196"><a href="#L-196"><span class="linenos">196</span></a>
</span><span id="L-197"><a href="#L-197"><span class="linenos">197</span></a> <span class="k">return</span> <span class="n">predicate</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span><span class="n">_replace_alias</span><span class="p">)</span>
</span></pre></div>
@ -290,13 +277,13 @@
<div class="attr function">
<span class="def">def</span>
<span class="name">pushdown_predicates</span><span class="signature pdoc-code condensed">(<span class="param"><span class="n">expression</span></span><span class="return-annotation">):</span></span>
<span class="name">pushdown_predicates</span><span class="signature pdoc-code condensed">(<span class="param"><span class="n">expression</span>, </span><span class="param"><span class="n">dialect</span><span class="o">=</span><span class="kc">None</span></span><span class="return-annotation">):</span></span>
<label class="view-source-button" for="pushdown_predicates-view-source"><span>View Source</span></label>
</div>
<a class="headerlink" href="#pushdown_predicates"></a>
<div class="pdoc-code codehilite"><pre><span></span><span id="pushdown_predicates-8"><a href="#pushdown_predicates-8"><span class="linenos"> 8</span></a><span class="k">def</span> <span class="nf">pushdown_predicates</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span>
<div class="pdoc-code codehilite"><pre><span></span><span id="pushdown_predicates-8"><a href="#pushdown_predicates-8"><span class="linenos"> 8</span></a><span class="k">def</span> <span class="nf">pushdown_predicates</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dialect</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
</span><span id="pushdown_predicates-9"><a href="#pushdown_predicates-9"><span class="linenos"> 9</span></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="pushdown_predicates-10"><a href="#pushdown_predicates-10"><span class="linenos">10</span></a><span class="sd"> Rewrite sqlglot AST to pushdown predicates in FROMS and JOINS</span>
</span><span id="pushdown_predicates-11"><a href="#pushdown_predicates-11"><span class="linenos">11</span></a>
@ -328,7 +315,7 @@
</span><span id="pushdown_predicates-37"><a href="#pushdown_predicates-37"><span class="linenos">37</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">parent</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">)</span> <span class="ow">and</span> <span class="n">parent</span><span class="o">.</span><span class="n">side</span> <span class="o">==</span> <span class="s2">&quot;RIGHT&quot;</span><span class="p">:</span>
</span><span id="pushdown_predicates-38"><a href="#pushdown_predicates-38"><span class="linenos">38</span></a> <span class="n">selected_sources</span> <span class="o">=</span> <span class="p">{</span><span class="n">k</span><span class="p">:</span> <span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">source</span><span class="p">)}</span>
</span><span id="pushdown_predicates-39"><a href="#pushdown_predicates-39"><span class="linenos">39</span></a> <span class="k">break</span>
</span><span id="pushdown_predicates-40"><a href="#pushdown_predicates-40"><span class="linenos">40</span></a> <span class="n">pushdown</span><span class="p">(</span><span class="n">where</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="n">selected_sources</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">)</span>
</span><span id="pushdown_predicates-40"><a href="#pushdown_predicates-40"><span class="linenos">40</span></a> <span class="n">pushdown</span><span class="p">(</span><span class="n">where</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="n">selected_sources</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">,</span> <span class="n">dialect</span><span class="p">)</span>
</span><span id="pushdown_predicates-41"><a href="#pushdown_predicates-41"><span class="linenos">41</span></a>
</span><span id="pushdown_predicates-42"><a href="#pushdown_predicates-42"><span class="linenos">42</span></a> <span class="c1"># joins should only pushdown into itself, not to other joins</span>
</span><span id="pushdown_predicates-43"><a href="#pushdown_predicates-43"><span class="linenos">43</span></a> <span class="c1"># so we limit the selected sources to only itself</span>
@ -336,10 +323,13 @@
</span><span id="pushdown_predicates-45"><a href="#pushdown_predicates-45"><span class="linenos">45</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">alias_or_name</span>
</span><span id="pushdown_predicates-46"><a href="#pushdown_predicates-46"><span class="linenos">46</span></a> <span class="k">if</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="p">:</span>
</span><span id="pushdown_predicates-47"><a href="#pushdown_predicates-47"><span class="linenos">47</span></a> <span class="n">pushdown</span><span class="p">(</span>
</span><span id="pushdown_predicates-48"><a href="#pushdown_predicates-48"><span class="linenos">48</span></a> <span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;on&quot;</span><span class="p">),</span> <span class="p">{</span><span class="n">name</span><span class="p">:</span> <span class="n">scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="p">[</span><span class="n">name</span><span class="p">]},</span> <span class="n">scope_ref_count</span>
</span><span id="pushdown_predicates-49"><a href="#pushdown_predicates-49"><span class="linenos">49</span></a> <span class="p">)</span>
</span><span id="pushdown_predicates-50"><a href="#pushdown_predicates-50"><span class="linenos">50</span></a>
</span><span id="pushdown_predicates-51"><a href="#pushdown_predicates-51"><span class="linenos">51</span></a> <span class="k">return</span> <span class="n">expression</span>
</span><span id="pushdown_predicates-48"><a href="#pushdown_predicates-48"><span class="linenos">48</span></a> <span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;on&quot;</span><span class="p">),</span>
</span><span id="pushdown_predicates-49"><a href="#pushdown_predicates-49"><span class="linenos">49</span></a> <span class="p">{</span><span class="n">name</span><span class="p">:</span> <span class="n">scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="p">[</span><span class="n">name</span><span class="p">]},</span>
</span><span id="pushdown_predicates-50"><a href="#pushdown_predicates-50"><span class="linenos">50</span></a> <span class="n">scope_ref_count</span><span class="p">,</span>
</span><span id="pushdown_predicates-51"><a href="#pushdown_predicates-51"><span class="linenos">51</span></a> <span class="n">dialect</span><span class="p">,</span>
</span><span id="pushdown_predicates-52"><a href="#pushdown_predicates-52"><span class="linenos">52</span></a> <span class="p">)</span>
</span><span id="pushdown_predicates-53"><a href="#pushdown_predicates-53"><span class="linenos">53</span></a>
</span><span id="pushdown_predicates-54"><a href="#pushdown_predicates-54"><span class="linenos">54</span></a> <span class="k">return</span> <span class="n">expression</span>
</span></pre></div>
@ -378,29 +368,29 @@
<div class="attr function">
<span class="def">def</span>
<span class="name">pushdown</span><span class="signature pdoc-code condensed">(<span class="param"><span class="n">condition</span>, </span><span class="param"><span class="n">sources</span>, </span><span class="param"><span class="n">scope_ref_count</span></span><span class="return-annotation">):</span></span>
<span class="name">pushdown</span><span class="signature pdoc-code condensed">(<span class="param"><span class="n">condition</span>, </span><span class="param"><span class="n">sources</span>, </span><span class="param"><span class="n">scope_ref_count</span>, </span><span class="param"><span class="n">dialect</span></span><span class="return-annotation">):</span></span>
<label class="view-source-button" for="pushdown-view-source"><span>View Source</span></label>
</div>
<a class="headerlink" href="#pushdown"></a>
<div class="pdoc-code codehilite"><pre><span></span><span id="pushdown-54"><a href="#pushdown-54"><span class="linenos">54</span></a><span class="k">def</span> <span class="nf">pushdown</span><span class="p">(</span><span class="n">condition</span><span class="p">,</span> <span class="n">sources</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">):</span>
</span><span id="pushdown-55"><a href="#pushdown-55"><span class="linenos">55</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">condition</span><span class="p">:</span>
</span><span id="pushdown-56"><a href="#pushdown-56"><span class="linenos">56</span></a> <span class="k">return</span>
</span><span id="pushdown-57"><a href="#pushdown-57"><span class="linenos">57</span></a>
</span><span id="pushdown-58"><a href="#pushdown-58"><span class="linenos">58</span></a> <span class="n">condition</span> <span class="o">=</span> <span class="n">condition</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">simplify</span><span class="p">(</span><span class="n">condition</span><span class="p">))</span>
</span><span id="pushdown-59"><a href="#pushdown-59"><span class="linenos">59</span></a> <span class="n">cnf_like</span> <span class="o">=</span> <span class="n">normalized</span><span class="p">(</span><span class="n">condition</span><span class="p">)</span> <span class="ow">or</span> <span class="ow">not</span> <span class="n">normalized</span><span class="p">(</span><span class="n">condition</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<div class="pdoc-code codehilite"><pre><span></span><span id="pushdown-57"><a href="#pushdown-57"><span class="linenos">57</span></a><span class="k">def</span> <span class="nf">pushdown</span><span class="p">(</span><span class="n">condition</span><span class="p">,</span> <span class="n">sources</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">,</span> <span class="n">dialect</span><span class="p">):</span>
</span><span id="pushdown-58"><a href="#pushdown-58"><span class="linenos">58</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">condition</span><span class="p">:</span>
</span><span id="pushdown-59"><a href="#pushdown-59"><span class="linenos">59</span></a> <span class="k">return</span>
</span><span id="pushdown-60"><a href="#pushdown-60"><span class="linenos">60</span></a>
</span><span id="pushdown-61"><a href="#pushdown-61"><span class="linenos">61</span></a> <span class="n">predicates</span> <span class="o">=</span> <span class="nb">list</span><span class="p">(</span>
</span><span id="pushdown-62"><a href="#pushdown-62"><span class="linenos">62</span></a> <span class="n">condition</span><span class="o">.</span><span class="n">flatten</span><span class="p">()</span>
</span><span id="pushdown-63"><a href="#pushdown-63"><span class="linenos">63</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">condition</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span> <span class="k">if</span> <span class="n">cnf_like</span> <span class="k">else</span> <span class="n">exp</span><span class="o">.</span><span class="n">Or</span><span class="p">)</span>
</span><span id="pushdown-64"><a href="#pushdown-64"><span class="linenos">64</span></a> <span class="k">else</span> <span class="p">[</span><span class="n">condition</span><span class="p">]</span>
</span><span id="pushdown-65"><a href="#pushdown-65"><span class="linenos">65</span></a> <span class="p">)</span>
</span><span id="pushdown-66"><a href="#pushdown-66"><span class="linenos">66</span></a>
</span><span id="pushdown-67"><a href="#pushdown-67"><span class="linenos">67</span></a> <span class="k">if</span> <span class="n">cnf_like</span><span class="p">:</span>
</span><span id="pushdown-68"><a href="#pushdown-68"><span class="linenos">68</span></a> <span class="n">pushdown_cnf</span><span class="p">(</span><span class="n">predicates</span><span class="p">,</span> <span class="n">sources</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">)</span>
</span><span id="pushdown-69"><a href="#pushdown-69"><span class="linenos">69</span></a> <span class="k">else</span><span class="p">:</span>
</span><span id="pushdown-70"><a href="#pushdown-70"><span class="linenos">70</span></a> <span class="n">pushdown_dnf</span><span class="p">(</span><span class="n">predicates</span><span class="p">,</span> <span class="n">sources</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">)</span>
</span><span id="pushdown-61"><a href="#pushdown-61"><span class="linenos">61</span></a> <span class="n">condition</span> <span class="o">=</span> <span class="n">condition</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">simplify</span><span class="p">(</span><span class="n">condition</span><span class="p">,</span> <span class="n">dialect</span><span class="o">=</span><span class="n">dialect</span><span class="p">))</span>
</span><span id="pushdown-62"><a href="#pushdown-62"><span class="linenos">62</span></a> <span class="n">cnf_like</span> <span class="o">=</span> <span class="n">normalized</span><span class="p">(</span><span class="n">condition</span><span class="p">)</span> <span class="ow">or</span> <span class="ow">not</span> <span class="n">normalized</span><span class="p">(</span><span class="n">condition</span><span class="p">,</span> <span class="n">dnf</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
</span><span id="pushdown-63"><a href="#pushdown-63"><span class="linenos">63</span></a>
</span><span id="pushdown-64"><a href="#pushdown-64"><span class="linenos">64</span></a> <span class="n">predicates</span> <span class="o">=</span> <span class="nb">list</span><span class="p">(</span>
</span><span id="pushdown-65"><a href="#pushdown-65"><span class="linenos">65</span></a> <span class="n">condition</span><span class="o">.</span><span class="n">flatten</span><span class="p">()</span>
</span><span id="pushdown-66"><a href="#pushdown-66"><span class="linenos">66</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">condition</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">And</span> <span class="k">if</span> <span class="n">cnf_like</span> <span class="k">else</span> <span class="n">exp</span><span class="o">.</span><span class="n">Or</span><span class="p">)</span>
</span><span id="pushdown-67"><a href="#pushdown-67"><span class="linenos">67</span></a> <span class="k">else</span> <span class="p">[</span><span class="n">condition</span><span class="p">]</span>
</span><span id="pushdown-68"><a href="#pushdown-68"><span class="linenos">68</span></a> <span class="p">)</span>
</span><span id="pushdown-69"><a href="#pushdown-69"><span class="linenos">69</span></a>
</span><span id="pushdown-70"><a href="#pushdown-70"><span class="linenos">70</span></a> <span class="k">if</span> <span class="n">cnf_like</span><span class="p">:</span>
</span><span id="pushdown-71"><a href="#pushdown-71"><span class="linenos">71</span></a> <span class="n">pushdown_cnf</span><span class="p">(</span><span class="n">predicates</span><span class="p">,</span> <span class="n">sources</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">)</span>
</span><span id="pushdown-72"><a href="#pushdown-72"><span class="linenos">72</span></a> <span class="k">else</span><span class="p">:</span>
</span><span id="pushdown-73"><a href="#pushdown-73"><span class="linenos">73</span></a> <span class="n">pushdown_dnf</span><span class="p">(</span><span class="n">predicates</span><span class="p">,</span> <span class="n">sources</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">)</span>
</span></pre></div>
@ -418,23 +408,23 @@
</div>
<a class="headerlink" href="#pushdown_cnf"></a>
<div class="pdoc-code codehilite"><pre><span></span><span id="pushdown_cnf-73"><a href="#pushdown_cnf-73"><span class="linenos">73</span></a><span class="k">def</span> <span class="nf">pushdown_cnf</span><span class="p">(</span><span class="n">predicates</span><span class="p">,</span> <span class="n">scope</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">):</span>
</span><span id="pushdown_cnf-74"><a href="#pushdown_cnf-74"><span class="linenos">74</span></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="pushdown_cnf-75"><a href="#pushdown_cnf-75"><span class="linenos">75</span></a><span class="sd"> If the predicates are in CNF like form, we can simply replace each block in the parent.</span>
</span><span id="pushdown_cnf-76"><a href="#pushdown_cnf-76"><span class="linenos">76</span></a><span class="sd"> &quot;&quot;&quot;</span>
</span><span id="pushdown_cnf-77"><a href="#pushdown_cnf-77"><span class="linenos">77</span></a> <span class="k">for</span> <span class="n">predicate</span> <span class="ow">in</span> <span class="n">predicates</span><span class="p">:</span>
</span><span id="pushdown_cnf-78"><a href="#pushdown_cnf-78"><span class="linenos">78</span></a> <span class="k">for</span> <span class="n">node</span> <span class="ow">in</span> <span class="n">nodes_for_predicate</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">scope</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">)</span><span class="o">.</span><span class="n">values</span><span class="p">():</span>
</span><span id="pushdown_cnf-79"><a href="#pushdown_cnf-79"><span class="linenos">79</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span>
</span><span id="pushdown_cnf-80"><a href="#pushdown_cnf-80"><span class="linenos">80</span></a> <span class="n">predicate</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
</span><span id="pushdown_cnf-81"><a href="#pushdown_cnf-81"><span class="linenos">81</span></a> <span class="n">node</span><span class="o">.</span><span class="n">on</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span><span id="pushdown_cnf-82"><a href="#pushdown_cnf-82"><span class="linenos">82</span></a> <span class="k">break</span>
</span><span id="pushdown_cnf-83"><a href="#pushdown_cnf-83"><span class="linenos">83</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">):</span>
</span><span id="pushdown_cnf-84"><a href="#pushdown_cnf-84"><span class="linenos">84</span></a> <span class="n">predicate</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
</span><span id="pushdown_cnf-85"><a href="#pushdown_cnf-85"><span class="linenos">85</span></a> <span class="n">inner_predicate</span> <span class="o">=</span> <span class="n">replace_aliases</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">predicate</span><span class="p">)</span>
</span><span id="pushdown_cnf-86"><a href="#pushdown_cnf-86"><span class="linenos">86</span></a> <span class="k">if</span> <span class="n">find_in_scope</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">AggFunc</span><span class="p">):</span>
</span><span id="pushdown_cnf-87"><a href="#pushdown_cnf-87"><span class="linenos">87</span></a> <span class="n">node</span><span class="o">.</span><span class="n">having</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span><span id="pushdown_cnf-88"><a href="#pushdown_cnf-88"><span class="linenos">88</span></a> <span class="k">else</span><span class="p">:</span>
</span><span id="pushdown_cnf-89"><a href="#pushdown_cnf-89"><span class="linenos">89</span></a> <span class="n">node</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
<div class="pdoc-code codehilite"><pre><span></span><span id="pushdown_cnf-76"><a href="#pushdown_cnf-76"><span class="linenos">76</span></a><span class="k">def</span> <span class="nf">pushdown_cnf</span><span class="p">(</span><span class="n">predicates</span><span class="p">,</span> <span class="n">scope</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">):</span>
</span><span id="pushdown_cnf-77"><a href="#pushdown_cnf-77"><span class="linenos">77</span></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="pushdown_cnf-78"><a href="#pushdown_cnf-78"><span class="linenos">78</span></a><span class="sd"> If the predicates are in CNF like form, we can simply replace each block in the parent.</span>
</span><span id="pushdown_cnf-79"><a href="#pushdown_cnf-79"><span class="linenos">79</span></a><span class="sd"> &quot;&quot;&quot;</span>
</span><span id="pushdown_cnf-80"><a href="#pushdown_cnf-80"><span class="linenos">80</span></a> <span class="k">for</span> <span class="n">predicate</span> <span class="ow">in</span> <span class="n">predicates</span><span class="p">:</span>
</span><span id="pushdown_cnf-81"><a href="#pushdown_cnf-81"><span class="linenos">81</span></a> <span class="k">for</span> <span class="n">node</span> <span class="ow">in</span> <span class="n">nodes_for_predicate</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">scope</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">)</span><span class="o">.</span><span class="n">values</span><span class="p">():</span>
</span><span id="pushdown_cnf-82"><a href="#pushdown_cnf-82"><span class="linenos">82</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span>
</span><span id="pushdown_cnf-83"><a href="#pushdown_cnf-83"><span class="linenos">83</span></a> <span class="n">predicate</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
</span><span id="pushdown_cnf-84"><a href="#pushdown_cnf-84"><span class="linenos">84</span></a> <span class="n">node</span><span class="o">.</span><span class="n">on</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span><span id="pushdown_cnf-85"><a href="#pushdown_cnf-85"><span class="linenos">85</span></a> <span class="k">break</span>
</span><span id="pushdown_cnf-86"><a href="#pushdown_cnf-86"><span class="linenos">86</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">):</span>
</span><span id="pushdown_cnf-87"><a href="#pushdown_cnf-87"><span class="linenos">87</span></a> <span class="n">predicate</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span>
</span><span id="pushdown_cnf-88"><a href="#pushdown_cnf-88"><span class="linenos">88</span></a> <span class="n">inner_predicate</span> <span class="o">=</span> <span class="n">replace_aliases</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">predicate</span><span class="p">)</span>
</span><span id="pushdown_cnf-89"><a href="#pushdown_cnf-89"><span class="linenos">89</span></a> <span class="k">if</span> <span class="n">find_in_scope</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">AggFunc</span><span class="p">):</span>
</span><span id="pushdown_cnf-90"><a href="#pushdown_cnf-90"><span class="linenos">90</span></a> <span class="n">node</span><span class="o">.</span><span class="n">having</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span><span id="pushdown_cnf-91"><a href="#pushdown_cnf-91"><span class="linenos">91</span></a> <span class="k">else</span><span class="p">:</span>
</span><span id="pushdown_cnf-92"><a href="#pushdown_cnf-92"><span class="linenos">92</span></a> <span class="n">node</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span></pre></div>
@ -454,69 +444,53 @@
</div>
<a class="headerlink" href="#pushdown_dnf"></a>
<div class="pdoc-code codehilite"><pre><span></span><span id="pushdown_dnf-92"><a href="#pushdown_dnf-92"><span class="linenos"> 92</span></a><span class="k">def</span> <span class="nf">pushdown_dnf</span><span class="p">(</span><span class="n">predicates</span><span class="p">,</span> <span class="n">scope</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">):</span>
</span><span id="pushdown_dnf-93"><a href="#pushdown_dnf-93"><span class="linenos"> 93</span></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="pushdown_dnf-94"><a href="#pushdown_dnf-94"><span class="linenos"> 94</span></a><span class="sd"> If the predicates are in DNF form, we can only push down conditions that are in all blocks.</span>
</span><span id="pushdown_dnf-95"><a href="#pushdown_dnf-95"><span class="linenos"> 95</span></a><span class="sd"> Additionally, we can&#39;t remove predicates from their original form.</span>
</span><span id="pushdown_dnf-96"><a href="#pushdown_dnf-96"><span class="linenos"> 96</span></a><span class="sd"> &quot;&quot;&quot;</span>
</span><span id="pushdown_dnf-97"><a href="#pushdown_dnf-97"><span class="linenos"> 97</span></a> <span class="c1"># find all the tables that can be pushdown too</span>
</span><span id="pushdown_dnf-98"><a href="#pushdown_dnf-98"><span class="linenos"> 98</span></a> <span class="c1"># these are tables that are referenced in all blocks of a DNF</span>
</span><span id="pushdown_dnf-99"><a href="#pushdown_dnf-99"><span class="linenos"> 99</span></a> <span class="c1"># (a.x AND b.x) OR (a.y AND c.y)</span>
</span><span id="pushdown_dnf-100"><a href="#pushdown_dnf-100"><span class="linenos">100</span></a> <span class="c1"># only table a can be push down</span>
</span><span id="pushdown_dnf-101"><a href="#pushdown_dnf-101"><span class="linenos">101</span></a> <span class="n">pushdown_tables</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>
</span><span id="pushdown_dnf-102"><a href="#pushdown_dnf-102"><span class="linenos">102</span></a>
</span><span id="pushdown_dnf-103"><a href="#pushdown_dnf-103"><span class="linenos">103</span></a> <span class="k">for</span> <span class="n">a</span> <span class="ow">in</span> <span class="n">predicates</span><span class="p">:</span>
</span><span id="pushdown_dnf-104"><a href="#pushdown_dnf-104"><span class="linenos">104</span></a> <span class="n">a_tables</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">a</span><span class="p">)</span>
<div class="pdoc-code codehilite"><pre><span></span><span id="pushdown_dnf-95"><a href="#pushdown_dnf-95"><span class="linenos"> 95</span></a><span class="k">def</span> <span class="nf">pushdown_dnf</span><span class="p">(</span><span class="n">predicates</span><span class="p">,</span> <span class="n">scope</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">):</span>
</span><span id="pushdown_dnf-96"><a href="#pushdown_dnf-96"><span class="linenos"> 96</span></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="pushdown_dnf-97"><a href="#pushdown_dnf-97"><span class="linenos"> 97</span></a><span class="sd"> If the predicates are in DNF form, we can only push down conditions that are in all blocks.</span>
</span><span id="pushdown_dnf-98"><a href="#pushdown_dnf-98"><span class="linenos"> 98</span></a><span class="sd"> Additionally, we can&#39;t remove predicates from their original form.</span>
</span><span id="pushdown_dnf-99"><a href="#pushdown_dnf-99"><span class="linenos"> 99</span></a><span class="sd"> &quot;&quot;&quot;</span>
</span><span id="pushdown_dnf-100"><a href="#pushdown_dnf-100"><span class="linenos">100</span></a> <span class="c1"># find all the tables that can be pushdown too</span>
</span><span id="pushdown_dnf-101"><a href="#pushdown_dnf-101"><span class="linenos">101</span></a> <span class="c1"># these are tables that are referenced in all blocks of a DNF</span>
</span><span id="pushdown_dnf-102"><a href="#pushdown_dnf-102"><span class="linenos">102</span></a> <span class="c1"># (a.x AND b.x) OR (a.y AND c.y)</span>
</span><span id="pushdown_dnf-103"><a href="#pushdown_dnf-103"><span class="linenos">103</span></a> <span class="c1"># only table a can be push down</span>
</span><span id="pushdown_dnf-104"><a href="#pushdown_dnf-104"><span class="linenos">104</span></a> <span class="n">pushdown_tables</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>
</span><span id="pushdown_dnf-105"><a href="#pushdown_dnf-105"><span class="linenos">105</span></a>
</span><span id="pushdown_dnf-106"><a href="#pushdown_dnf-106"><span class="linenos">106</span></a> <span class="k">for</span> <span class="n">b</span> <span class="ow">in</span> <span class="n">predicates</span><span class="p">:</span>
</span><span id="pushdown_dnf-107"><a href="#pushdown_dnf-107"><span class="linenos">107</span></a> <span class="n">a_tables</span> <span class="o">&amp;=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">b</span><span class="p">)</span>
</span><span id="pushdown_dnf-106"><a href="#pushdown_dnf-106"><span class="linenos">106</span></a> <span class="k">for</span> <span class="n">a</span> <span class="ow">in</span> <span class="n">predicates</span><span class="p">:</span>
</span><span id="pushdown_dnf-107"><a href="#pushdown_dnf-107"><span class="linenos">107</span></a> <span class="n">a_tables</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">a</span><span class="p">)</span>
</span><span id="pushdown_dnf-108"><a href="#pushdown_dnf-108"><span class="linenos">108</span></a>
</span><span id="pushdown_dnf-109"><a href="#pushdown_dnf-109"><span class="linenos">109</span></a> <span class="n">pushdown_tables</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">a_tables</span><span class="p">)</span>
</span><span id="pushdown_dnf-110"><a href="#pushdown_dnf-110"><span class="linenos">110</span></a>
</span><span id="pushdown_dnf-111"><a href="#pushdown_dnf-111"><span class="linenos">111</span></a> <span class="n">conditions</span> <span class="o">=</span> <span class="p">{}</span>
</span><span id="pushdown_dnf-112"><a href="#pushdown_dnf-112"><span class="linenos">112</span></a>
</span><span id="pushdown_dnf-113"><a href="#pushdown_dnf-113"><span class="linenos">113</span></a> <span class="c1"># for every pushdown table, find all related conditions in all predicates</span>
</span><span id="pushdown_dnf-114"><a href="#pushdown_dnf-114"><span class="linenos">114</span></a> <span class="c1"># combine them with ORS</span>
</span><span id="pushdown_dnf-115"><a href="#pushdown_dnf-115"><span class="linenos">115</span></a> <span class="c1"># (a.x AND and a.y AND b.x) OR (a.z AND c.y) -&gt; (a.x AND a.y) OR (a.z)</span>
</span><span id="pushdown_dnf-116"><a href="#pushdown_dnf-116"><span class="linenos">116</span></a> <span class="k">for</span> <span class="n">table</span> <span class="ow">in</span> <span class="nb">sorted</span><span class="p">(</span><span class="n">pushdown_tables</span><span class="p">):</span>
</span><span id="pushdown_dnf-117"><a href="#pushdown_dnf-117"><span class="linenos">117</span></a> <span class="k">for</span> <span class="n">predicate</span> <span class="ow">in</span> <span class="n">predicates</span><span class="p">:</span>
</span><span id="pushdown_dnf-118"><a href="#pushdown_dnf-118"><span class="linenos">118</span></a> <span class="n">nodes</span> <span class="o">=</span> <span class="n">nodes_for_predicate</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">scope</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">)</span>
</span><span id="pushdown_dnf-119"><a href="#pushdown_dnf-119"><span class="linenos">119</span></a>
</span><span id="pushdown_dnf-120"><a href="#pushdown_dnf-120"><span class="linenos">120</span></a> <span class="k">if</span> <span class="n">table</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">nodes</span><span class="p">:</span>
</span><span id="pushdown_dnf-121"><a href="#pushdown_dnf-121"><span class="linenos">121</span></a> <span class="k">continue</span>
</span><span id="pushdown_dnf-122"><a href="#pushdown_dnf-122"><span class="linenos">122</span></a>
</span><span id="pushdown_dnf-123"><a href="#pushdown_dnf-123"><span class="linenos">123</span></a> <span class="n">predicate_condition</span> <span class="o">=</span> <span class="kc">None</span>
</span><span id="pushdown_dnf-124"><a href="#pushdown_dnf-124"><span class="linenos">124</span></a>
</span><span id="pushdown_dnf-125"><a href="#pushdown_dnf-125"><span class="linenos">125</span></a> <span class="k">for</span> <span class="n">column</span> <span class="ow">in</span> <span class="n">predicate</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">):</span>
</span><span id="pushdown_dnf-126"><a href="#pushdown_dnf-126"><span class="linenos">126</span></a> <span class="k">if</span> <span class="n">column</span><span class="o">.</span><span class="n">table</span> <span class="o">==</span> <span class="n">table</span><span class="p">:</span>
</span><span id="pushdown_dnf-127"><a href="#pushdown_dnf-127"><span class="linenos">127</span></a> <span class="n">condition</span> <span class="o">=</span> <span class="n">column</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Condition</span><span class="p">)</span>
</span><span id="pushdown_dnf-128"><a href="#pushdown_dnf-128"><span class="linenos">128</span></a> <span class="n">predicate_condition</span> <span class="o">=</span> <span class="p">(</span>
</span><span id="pushdown_dnf-129"><a href="#pushdown_dnf-129"><span class="linenos">129</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">and_</span><span class="p">(</span><span class="n">predicate_condition</span><span class="p">,</span> <span class="n">condition</span><span class="p">)</span>
</span><span id="pushdown_dnf-130"><a href="#pushdown_dnf-130"><span class="linenos">130</span></a> <span class="k">if</span> <span class="n">predicate_condition</span>
</span><span id="pushdown_dnf-131"><a href="#pushdown_dnf-131"><span class="linenos">131</span></a> <span class="k">else</span> <span class="n">condition</span>
</span><span id="pushdown_dnf-132"><a href="#pushdown_dnf-132"><span class="linenos">132</span></a> <span class="p">)</span>
</span><span id="pushdown_dnf-109"><a href="#pushdown_dnf-109"><span class="linenos">109</span></a> <span class="k">for</span> <span class="n">b</span> <span class="ow">in</span> <span class="n">predicates</span><span class="p">:</span>
</span><span id="pushdown_dnf-110"><a href="#pushdown_dnf-110"><span class="linenos">110</span></a> <span class="n">a_tables</span> <span class="o">&amp;=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">b</span><span class="p">)</span>
</span><span id="pushdown_dnf-111"><a href="#pushdown_dnf-111"><span class="linenos">111</span></a>
</span><span id="pushdown_dnf-112"><a href="#pushdown_dnf-112"><span class="linenos">112</span></a> <span class="n">pushdown_tables</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">a_tables</span><span class="p">)</span>
</span><span id="pushdown_dnf-113"><a href="#pushdown_dnf-113"><span class="linenos">113</span></a>
</span><span id="pushdown_dnf-114"><a href="#pushdown_dnf-114"><span class="linenos">114</span></a> <span class="n">conditions</span> <span class="o">=</span> <span class="p">{}</span>
</span><span id="pushdown_dnf-115"><a href="#pushdown_dnf-115"><span class="linenos">115</span></a>
</span><span id="pushdown_dnf-116"><a href="#pushdown_dnf-116"><span class="linenos">116</span></a> <span class="c1"># pushdown all predicates to their respective nodes</span>
</span><span id="pushdown_dnf-117"><a href="#pushdown_dnf-117"><span class="linenos">117</span></a> <span class="k">for</span> <span class="n">table</span> <span class="ow">in</span> <span class="nb">sorted</span><span class="p">(</span><span class="n">pushdown_tables</span><span class="p">):</span>
</span><span id="pushdown_dnf-118"><a href="#pushdown_dnf-118"><span class="linenos">118</span></a> <span class="k">for</span> <span class="n">predicate</span> <span class="ow">in</span> <span class="n">predicates</span><span class="p">:</span>
</span><span id="pushdown_dnf-119"><a href="#pushdown_dnf-119"><span class="linenos">119</span></a> <span class="n">nodes</span> <span class="o">=</span> <span class="n">nodes_for_predicate</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">scope</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">)</span>
</span><span id="pushdown_dnf-120"><a href="#pushdown_dnf-120"><span class="linenos">120</span></a>
</span><span id="pushdown_dnf-121"><a href="#pushdown_dnf-121"><span class="linenos">121</span></a> <span class="k">if</span> <span class="n">table</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">nodes</span><span class="p">:</span>
</span><span id="pushdown_dnf-122"><a href="#pushdown_dnf-122"><span class="linenos">122</span></a> <span class="k">continue</span>
</span><span id="pushdown_dnf-123"><a href="#pushdown_dnf-123"><span class="linenos">123</span></a>
</span><span id="pushdown_dnf-124"><a href="#pushdown_dnf-124"><span class="linenos">124</span></a> <span class="n">conditions</span><span class="p">[</span><span class="n">table</span><span class="p">]</span> <span class="o">=</span> <span class="p">(</span>
</span><span id="pushdown_dnf-125"><a href="#pushdown_dnf-125"><span class="linenos">125</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">or_</span><span class="p">(</span><span class="n">conditions</span><span class="p">[</span><span class="n">table</span><span class="p">],</span> <span class="n">predicate</span><span class="p">)</span> <span class="k">if</span> <span class="n">table</span> <span class="ow">in</span> <span class="n">conditions</span> <span class="k">else</span> <span class="n">predicate</span>
</span><span id="pushdown_dnf-126"><a href="#pushdown_dnf-126"><span class="linenos">126</span></a> <span class="p">)</span>
</span><span id="pushdown_dnf-127"><a href="#pushdown_dnf-127"><span class="linenos">127</span></a>
</span><span id="pushdown_dnf-128"><a href="#pushdown_dnf-128"><span class="linenos">128</span></a> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">node</span> <span class="ow">in</span> <span class="n">nodes</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
</span><span id="pushdown_dnf-129"><a href="#pushdown_dnf-129"><span class="linenos">129</span></a> <span class="k">if</span> <span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">conditions</span><span class="p">:</span>
</span><span id="pushdown_dnf-130"><a href="#pushdown_dnf-130"><span class="linenos">130</span></a> <span class="k">continue</span>
</span><span id="pushdown_dnf-131"><a href="#pushdown_dnf-131"><span class="linenos">131</span></a>
</span><span id="pushdown_dnf-132"><a href="#pushdown_dnf-132"><span class="linenos">132</span></a> <span class="n">predicate</span> <span class="o">=</span> <span class="n">conditions</span><span class="p">[</span><span class="n">name</span><span class="p">]</span>
</span><span id="pushdown_dnf-133"><a href="#pushdown_dnf-133"><span class="linenos">133</span></a>
</span><span id="pushdown_dnf-134"><a href="#pushdown_dnf-134"><span class="linenos">134</span></a> <span class="k">if</span> <span class="n">predicate_condition</span><span class="p">:</span>
</span><span id="pushdown_dnf-135"><a href="#pushdown_dnf-135"><span class="linenos">135</span></a> <span class="n">conditions</span><span class="p">[</span><span class="n">table</span><span class="p">]</span> <span class="o">=</span> <span class="p">(</span>
</span><span id="pushdown_dnf-136"><a href="#pushdown_dnf-136"><span class="linenos">136</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">or_</span><span class="p">(</span><span class="n">conditions</span><span class="p">[</span><span class="n">table</span><span class="p">],</span> <span class="n">predicate_condition</span><span class="p">)</span>
</span><span id="pushdown_dnf-137"><a href="#pushdown_dnf-137"><span class="linenos">137</span></a> <span class="k">if</span> <span class="n">table</span> <span class="ow">in</span> <span class="n">conditions</span>
</span><span id="pushdown_dnf-138"><a href="#pushdown_dnf-138"><span class="linenos">138</span></a> <span class="k">else</span> <span class="n">predicate_condition</span>
</span><span id="pushdown_dnf-139"><a href="#pushdown_dnf-139"><span class="linenos">139</span></a> <span class="p">)</span>
</span><span id="pushdown_dnf-140"><a href="#pushdown_dnf-140"><span class="linenos">140</span></a>
</span><span id="pushdown_dnf-141"><a href="#pushdown_dnf-141"><span class="linenos">141</span></a> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">node</span> <span class="ow">in</span> <span class="n">nodes</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
</span><span id="pushdown_dnf-142"><a href="#pushdown_dnf-142"><span class="linenos">142</span></a> <span class="k">if</span> <span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">conditions</span><span class="p">:</span>
</span><span id="pushdown_dnf-143"><a href="#pushdown_dnf-143"><span class="linenos">143</span></a> <span class="k">continue</span>
</span><span id="pushdown_dnf-144"><a href="#pushdown_dnf-144"><span class="linenos">144</span></a>
</span><span id="pushdown_dnf-145"><a href="#pushdown_dnf-145"><span class="linenos">145</span></a> <span class="n">predicate</span> <span class="o">=</span> <span class="n">conditions</span><span class="p">[</span><span class="n">name</span><span class="p">]</span>
</span><span id="pushdown_dnf-146"><a href="#pushdown_dnf-146"><span class="linenos">146</span></a>
</span><span id="pushdown_dnf-147"><a href="#pushdown_dnf-147"><span class="linenos">147</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span>
</span><span id="pushdown_dnf-148"><a href="#pushdown_dnf-148"><span class="linenos">148</span></a> <span class="n">node</span><span class="o">.</span><span class="n">on</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span><span id="pushdown_dnf-149"><a href="#pushdown_dnf-149"><span class="linenos">149</span></a> <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">):</span>
</span><span id="pushdown_dnf-150"><a href="#pushdown_dnf-150"><span class="linenos">150</span></a> <span class="n">inner_predicate</span> <span class="o">=</span> <span class="n">replace_aliases</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">predicate</span><span class="p">)</span>
</span><span id="pushdown_dnf-151"><a href="#pushdown_dnf-151"><span class="linenos">151</span></a> <span class="k">if</span> <span class="n">find_in_scope</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">AggFunc</span><span class="p">):</span>
</span><span id="pushdown_dnf-152"><a href="#pushdown_dnf-152"><span class="linenos">152</span></a> <span class="n">node</span><span class="o">.</span><span class="n">having</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span><span id="pushdown_dnf-153"><a href="#pushdown_dnf-153"><span class="linenos">153</span></a> <span class="k">else</span><span class="p">:</span>
</span><span id="pushdown_dnf-154"><a href="#pushdown_dnf-154"><span class="linenos">154</span></a> <span class="n">node</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span><span id="pushdown_dnf-134"><a href="#pushdown_dnf-134"><span class="linenos">134</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span>
</span><span id="pushdown_dnf-135"><a href="#pushdown_dnf-135"><span class="linenos">135</span></a> <span class="n">node</span><span class="o">.</span><span class="n">on</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span><span id="pushdown_dnf-136"><a href="#pushdown_dnf-136"><span class="linenos">136</span></a> <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">):</span>
</span><span id="pushdown_dnf-137"><a href="#pushdown_dnf-137"><span class="linenos">137</span></a> <span class="n">inner_predicate</span> <span class="o">=</span> <span class="n">replace_aliases</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">predicate</span><span class="p">)</span>
</span><span id="pushdown_dnf-138"><a href="#pushdown_dnf-138"><span class="linenos">138</span></a> <span class="k">if</span> <span class="n">find_in_scope</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">AggFunc</span><span class="p">):</span>
</span><span id="pushdown_dnf-139"><a href="#pushdown_dnf-139"><span class="linenos">139</span></a> <span class="n">node</span><span class="o">.</span><span class="n">having</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span><span id="pushdown_dnf-140"><a href="#pushdown_dnf-140"><span class="linenos">140</span></a> <span class="k">else</span><span class="p">:</span>
</span><span id="pushdown_dnf-141"><a href="#pushdown_dnf-141"><span class="linenos">141</span></a> <span class="n">node</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">inner_predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
</span></pre></div>
@ -537,44 +511,44 @@ Additionally, we can't remove predicates from their original form.</p>
</div>
<a class="headerlink" href="#nodes_for_predicate"></a>
<div class="pdoc-code codehilite"><pre><span></span><span id="nodes_for_predicate-157"><a href="#nodes_for_predicate-157"><span class="linenos">157</span></a><span class="k">def</span> <span class="nf">nodes_for_predicate</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">sources</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">):</span>
</span><span id="nodes_for_predicate-158"><a href="#nodes_for_predicate-158"><span class="linenos">158</span></a> <span class="n">nodes</span> <span class="o">=</span> <span class="p">{}</span>
</span><span id="nodes_for_predicate-159"><a href="#nodes_for_predicate-159"><span class="linenos">159</span></a> <span class="n">tables</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">predicate</span><span class="p">)</span>
</span><span id="nodes_for_predicate-160"><a href="#nodes_for_predicate-160"><span class="linenos">160</span></a> <span class="n">where_condition</span> <span class="o">=</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">predicate</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Where</span><span class="p">),</span> <span class="n">exp</span><span class="o">.</span><span class="n">Where</span><span class="p">)</span>
</span><span id="nodes_for_predicate-161"><a href="#nodes_for_predicate-161"><span class="linenos">161</span></a>
</span><span id="nodes_for_predicate-162"><a href="#nodes_for_predicate-162"><span class="linenos">162</span></a> <span class="k">for</span> <span class="n">table</span> <span class="ow">in</span> <span class="nb">sorted</span><span class="p">(</span><span class="n">tables</span><span class="p">):</span>
</span><span id="nodes_for_predicate-163"><a href="#nodes_for_predicate-163"><span class="linenos">163</span></a> <span class="n">node</span><span class="p">,</span> <span class="n">source</span> <span class="o">=</span> <span class="n">sources</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">table</span><span class="p">)</span> <span class="ow">or</span> <span class="p">(</span><span class="kc">None</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
</span><span id="nodes_for_predicate-164"><a href="#nodes_for_predicate-164"><span class="linenos">164</span></a>
</span><span id="nodes_for_predicate-165"><a href="#nodes_for_predicate-165"><span class="linenos">165</span></a> <span class="c1"># if the predicate is in a where statement we can try to push it down</span>
</span><span id="nodes_for_predicate-166"><a href="#nodes_for_predicate-166"><span class="linenos">166</span></a> <span class="c1"># we want to find the root join or from statement</span>
</span><span id="nodes_for_predicate-167"><a href="#nodes_for_predicate-167"><span class="linenos">167</span></a> <span class="k">if</span> <span class="n">node</span> <span class="ow">and</span> <span class="n">where_condition</span><span class="p">:</span>
</span><span id="nodes_for_predicate-168"><a href="#nodes_for_predicate-168"><span class="linenos">168</span></a> <span class="n">node</span> <span class="o">=</span> <span class="n">node</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">)</span>
</span><span id="nodes_for_predicate-169"><a href="#nodes_for_predicate-169"><span class="linenos">169</span></a>
</span><span id="nodes_for_predicate-170"><a href="#nodes_for_predicate-170"><span class="linenos">170</span></a> <span class="c1"># a node can reference a CTE which should be pushed down</span>
</span><span id="nodes_for_predicate-171"><a href="#nodes_for_predicate-171"><span class="linenos">171</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">)</span> <span class="ow">and</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Table</span><span class="p">):</span>
</span><span id="nodes_for_predicate-172"><a href="#nodes_for_predicate-172"><span class="linenos">172</span></a> <span class="n">with_</span> <span class="o">=</span> <span class="n">source</span><span class="o">.</span><span class="n">parent</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">&quot;with&quot;</span><span class="p">)</span>
</span><span id="nodes_for_predicate-173"><a href="#nodes_for_predicate-173"><span class="linenos">173</span></a> <span class="k">if</span> <span class="n">with_</span> <span class="ow">and</span> <span class="n">with_</span><span class="o">.</span><span class="n">recursive</span><span class="p">:</span>
</span><span id="nodes_for_predicate-174"><a href="#nodes_for_predicate-174"><span class="linenos">174</span></a> <span class="k">return</span> <span class="p">{}</span>
</span><span id="nodes_for_predicate-175"><a href="#nodes_for_predicate-175"><span class="linenos">175</span></a> <span class="n">node</span> <span class="o">=</span> <span class="n">source</span><span class="o">.</span><span class="n">expression</span>
</span><span id="nodes_for_predicate-176"><a href="#nodes_for_predicate-176"><span class="linenos">176</span></a>
</span><span id="nodes_for_predicate-177"><a href="#nodes_for_predicate-177"><span class="linenos">177</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span>
</span><span id="nodes_for_predicate-178"><a href="#nodes_for_predicate-178"><span class="linenos">178</span></a> <span class="k">if</span> <span class="n">node</span><span class="o">.</span><span class="n">side</span> <span class="ow">and</span> <span class="n">node</span><span class="o">.</span><span class="n">side</span> <span class="o">!=</span> <span class="s2">&quot;RIGHT&quot;</span><span class="p">:</span>
</span><span id="nodes_for_predicate-179"><a href="#nodes_for_predicate-179"><span class="linenos">179</span></a> <span class="k">return</span> <span class="p">{}</span>
</span><span id="nodes_for_predicate-180"><a href="#nodes_for_predicate-180"><span class="linenos">180</span></a> <span class="n">nodes</span><span class="p">[</span><span class="n">table</span><span class="p">]</span> <span class="o">=</span> <span class="n">node</span>
</span><span id="nodes_for_predicate-181"><a href="#nodes_for_predicate-181"><span class="linenos">181</span></a> <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">len</span><span class="p">(</span><span class="n">tables</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
</span><span id="nodes_for_predicate-182"><a href="#nodes_for_predicate-182"><span class="linenos">182</span></a> <span class="c1"># We can&#39;t push down window expressions</span>
</span><span id="nodes_for_predicate-183"><a href="#nodes_for_predicate-183"><span class="linenos">183</span></a> <span class="n">has_window_expression</span> <span class="o">=</span> <span class="nb">any</span><span class="p">(</span>
</span><span id="nodes_for_predicate-184"><a href="#nodes_for_predicate-184"><span class="linenos">184</span></a> <span class="n">select</span> <span class="k">for</span> <span class="n">select</span> <span class="ow">in</span> <span class="n">node</span><span class="o">.</span><span class="n">selects</span> <span class="k">if</span> <span class="n">select</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">Window</span><span class="p">)</span>
</span><span id="nodes_for_predicate-185"><a href="#nodes_for_predicate-185"><span class="linenos">185</span></a> <span class="p">)</span>
</span><span id="nodes_for_predicate-186"><a href="#nodes_for_predicate-186"><span class="linenos">186</span></a> <span class="c1"># we can&#39;t push down predicates to select statements if they are referenced in</span>
</span><span id="nodes_for_predicate-187"><a href="#nodes_for_predicate-187"><span class="linenos">187</span></a> <span class="c1"># multiple places.</span>
</span><span id="nodes_for_predicate-188"><a href="#nodes_for_predicate-188"><span class="linenos">188</span></a> <span class="k">if</span> <span class="p">(</span>
</span><span id="nodes_for_predicate-189"><a href="#nodes_for_predicate-189"><span class="linenos">189</span></a> <span class="ow">not</span> <span class="n">node</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">&quot;group&quot;</span><span class="p">)</span>
</span><span id="nodes_for_predicate-190"><a href="#nodes_for_predicate-190"><span class="linenos">190</span></a> <span class="ow">and</span> <span class="n">scope_ref_count</span><span class="p">[</span><span class="nb">id</span><span class="p">(</span><span class="n">source</span><span class="p">)]</span> <span class="o">&lt;</span> <span class="mi">2</span>
</span><span id="nodes_for_predicate-191"><a href="#nodes_for_predicate-191"><span class="linenos">191</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="n">has_window_expression</span>
</span><span id="nodes_for_predicate-192"><a href="#nodes_for_predicate-192"><span class="linenos">192</span></a> <span class="p">):</span>
</span><span id="nodes_for_predicate-193"><a href="#nodes_for_predicate-193"><span class="linenos">193</span></a> <span class="n">nodes</span><span class="p">[</span><span class="n">table</span><span class="p">]</span> <span class="o">=</span> <span class="n">node</span>
</span><span id="nodes_for_predicate-194"><a href="#nodes_for_predicate-194"><span class="linenos">194</span></a> <span class="k">return</span> <span class="n">nodes</span>
<div class="pdoc-code codehilite"><pre><span></span><span id="nodes_for_predicate-144"><a href="#nodes_for_predicate-144"><span class="linenos">144</span></a><span class="k">def</span> <span class="nf">nodes_for_predicate</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">sources</span><span class="p">,</span> <span class="n">scope_ref_count</span><span class="p">):</span>
</span><span id="nodes_for_predicate-145"><a href="#nodes_for_predicate-145"><span class="linenos">145</span></a> <span class="n">nodes</span> <span class="o">=</span> <span class="p">{}</span>
</span><span id="nodes_for_predicate-146"><a href="#nodes_for_predicate-146"><span class="linenos">146</span></a> <span class="n">tables</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">predicate</span><span class="p">)</span>
</span><span id="nodes_for_predicate-147"><a href="#nodes_for_predicate-147"><span class="linenos">147</span></a> <span class="n">where_condition</span> <span class="o">=</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">predicate</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Where</span><span class="p">),</span> <span class="n">exp</span><span class="o">.</span><span class="n">Where</span><span class="p">)</span>
</span><span id="nodes_for_predicate-148"><a href="#nodes_for_predicate-148"><span class="linenos">148</span></a>
</span><span id="nodes_for_predicate-149"><a href="#nodes_for_predicate-149"><span class="linenos">149</span></a> <span class="k">for</span> <span class="n">table</span> <span class="ow">in</span> <span class="nb">sorted</span><span class="p">(</span><span class="n">tables</span><span class="p">):</span>
</span><span id="nodes_for_predicate-150"><a href="#nodes_for_predicate-150"><span class="linenos">150</span></a> <span class="n">node</span><span class="p">,</span> <span class="n">source</span> <span class="o">=</span> <span class="n">sources</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">table</span><span class="p">)</span> <span class="ow">or</span> <span class="p">(</span><span class="kc">None</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
</span><span id="nodes_for_predicate-151"><a href="#nodes_for_predicate-151"><span class="linenos">151</span></a>
</span><span id="nodes_for_predicate-152"><a href="#nodes_for_predicate-152"><span class="linenos">152</span></a> <span class="c1"># if the predicate is in a where statement we can try to push it down</span>
</span><span id="nodes_for_predicate-153"><a href="#nodes_for_predicate-153"><span class="linenos">153</span></a> <span class="c1"># we want to find the root join or from statement</span>
</span><span id="nodes_for_predicate-154"><a href="#nodes_for_predicate-154"><span class="linenos">154</span></a> <span class="k">if</span> <span class="n">node</span> <span class="ow">and</span> <span class="n">where_condition</span><span class="p">:</span>
</span><span id="nodes_for_predicate-155"><a href="#nodes_for_predicate-155"><span class="linenos">155</span></a> <span class="n">node</span> <span class="o">=</span> <span class="n">node</span><span class="o">.</span><span class="n">find_ancestor</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">)</span>
</span><span id="nodes_for_predicate-156"><a href="#nodes_for_predicate-156"><span class="linenos">156</span></a>
</span><span id="nodes_for_predicate-157"><a href="#nodes_for_predicate-157"><span class="linenos">157</span></a> <span class="c1"># a node can reference a CTE which should be pushed down</span>
</span><span id="nodes_for_predicate-158"><a href="#nodes_for_predicate-158"><span class="linenos">158</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">)</span> <span class="ow">and</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Table</span><span class="p">):</span>
</span><span id="nodes_for_predicate-159"><a href="#nodes_for_predicate-159"><span class="linenos">159</span></a> <span class="n">with_</span> <span class="o">=</span> <span class="n">source</span><span class="o">.</span><span class="n">parent</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">&quot;with&quot;</span><span class="p">)</span>
</span><span id="nodes_for_predicate-160"><a href="#nodes_for_predicate-160"><span class="linenos">160</span></a> <span class="k">if</span> <span class="n">with_</span> <span class="ow">and</span> <span class="n">with_</span><span class="o">.</span><span class="n">recursive</span><span class="p">:</span>
</span><span id="nodes_for_predicate-161"><a href="#nodes_for_predicate-161"><span class="linenos">161</span></a> <span class="k">return</span> <span class="p">{}</span>
</span><span id="nodes_for_predicate-162"><a href="#nodes_for_predicate-162"><span class="linenos">162</span></a> <span class="n">node</span> <span class="o">=</span> <span class="n">source</span><span class="o">.</span><span class="n">expression</span>
</span><span id="nodes_for_predicate-163"><a href="#nodes_for_predicate-163"><span class="linenos">163</span></a>
</span><span id="nodes_for_predicate-164"><a href="#nodes_for_predicate-164"><span class="linenos">164</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span>
</span><span id="nodes_for_predicate-165"><a href="#nodes_for_predicate-165"><span class="linenos">165</span></a> <span class="k">if</span> <span class="n">node</span><span class="o">.</span><span class="n">side</span> <span class="ow">and</span> <span class="n">node</span><span class="o">.</span><span class="n">side</span> <span class="o">!=</span> <span class="s2">&quot;RIGHT&quot;</span><span class="p">:</span>
</span><span id="nodes_for_predicate-166"><a href="#nodes_for_predicate-166"><span class="linenos">166</span></a> <span class="k">return</span> <span class="p">{}</span>
</span><span id="nodes_for_predicate-167"><a href="#nodes_for_predicate-167"><span class="linenos">167</span></a> <span class="n">nodes</span><span class="p">[</span><span class="n">table</span><span class="p">]</span> <span class="o">=</span> <span class="n">node</span>
</span><span id="nodes_for_predicate-168"><a href="#nodes_for_predicate-168"><span class="linenos">168</span></a> <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">len</span><span class="p">(</span><span class="n">tables</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
</span><span id="nodes_for_predicate-169"><a href="#nodes_for_predicate-169"><span class="linenos">169</span></a> <span class="c1"># We can&#39;t push down window expressions</span>
</span><span id="nodes_for_predicate-170"><a href="#nodes_for_predicate-170"><span class="linenos">170</span></a> <span class="n">has_window_expression</span> <span class="o">=</span> <span class="nb">any</span><span class="p">(</span>
</span><span id="nodes_for_predicate-171"><a href="#nodes_for_predicate-171"><span class="linenos">171</span></a> <span class="n">select</span> <span class="k">for</span> <span class="n">select</span> <span class="ow">in</span> <span class="n">node</span><span class="o">.</span><span class="n">selects</span> <span class="k">if</span> <span class="n">select</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">Window</span><span class="p">)</span>
</span><span id="nodes_for_predicate-172"><a href="#nodes_for_predicate-172"><span class="linenos">172</span></a> <span class="p">)</span>
</span><span id="nodes_for_predicate-173"><a href="#nodes_for_predicate-173"><span class="linenos">173</span></a> <span class="c1"># we can&#39;t push down predicates to select statements if they are referenced in</span>
</span><span id="nodes_for_predicate-174"><a href="#nodes_for_predicate-174"><span class="linenos">174</span></a> <span class="c1"># multiple places.</span>
</span><span id="nodes_for_predicate-175"><a href="#nodes_for_predicate-175"><span class="linenos">175</span></a> <span class="k">if</span> <span class="p">(</span>
</span><span id="nodes_for_predicate-176"><a href="#nodes_for_predicate-176"><span class="linenos">176</span></a> <span class="ow">not</span> <span class="n">node</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">&quot;group&quot;</span><span class="p">)</span>
</span><span id="nodes_for_predicate-177"><a href="#nodes_for_predicate-177"><span class="linenos">177</span></a> <span class="ow">and</span> <span class="n">scope_ref_count</span><span class="p">[</span><span class="nb">id</span><span class="p">(</span><span class="n">source</span><span class="p">)]</span> <span class="o">&lt;</span> <span class="mi">2</span>
</span><span id="nodes_for_predicate-178"><a href="#nodes_for_predicate-178"><span class="linenos">178</span></a> <span class="ow">and</span> <span class="ow">not</span> <span class="n">has_window_expression</span>
</span><span id="nodes_for_predicate-179"><a href="#nodes_for_predicate-179"><span class="linenos">179</span></a> <span class="p">):</span>
</span><span id="nodes_for_predicate-180"><a href="#nodes_for_predicate-180"><span class="linenos">180</span></a> <span class="n">nodes</span><span class="p">[</span><span class="n">table</span><span class="p">]</span> <span class="o">=</span> <span class="n">node</span>
</span><span id="nodes_for_predicate-181"><a href="#nodes_for_predicate-181"><span class="linenos">181</span></a> <span class="k">return</span> <span class="n">nodes</span>
</span></pre></div>
@ -592,21 +566,21 @@ Additionally, we can't remove predicates from their original form.</p>
</div>
<a class="headerlink" href="#replace_aliases"></a>
<div class="pdoc-code codehilite"><pre><span></span><span id="replace_aliases-197"><a href="#replace_aliases-197"><span class="linenos">197</span></a><span class="k">def</span> <span class="nf">replace_aliases</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">predicate</span><span class="p">):</span>
</span><span id="replace_aliases-198"><a href="#replace_aliases-198"><span class="linenos">198</span></a> <span class="n">aliases</span> <span class="o">=</span> <span class="p">{}</span>
</span><span id="replace_aliases-199"><a href="#replace_aliases-199"><span class="linenos">199</span></a>
</span><span id="replace_aliases-200"><a href="#replace_aliases-200"><span class="linenos">200</span></a> <span class="k">for</span> <span class="n">select</span> <span class="ow">in</span> <span class="n">source</span><span class="o">.</span><span class="n">selects</span><span class="p">:</span>
</span><span id="replace_aliases-201"><a href="#replace_aliases-201"><span class="linenos">201</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>
</span><span id="replace_aliases-202"><a href="#replace_aliases-202"><span class="linenos">202</span></a> <span class="n">aliases</span><span class="p">[</span><span class="n">select</span><span class="o">.</span><span class="n">alias</span><span class="p">]</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">this</span>
</span><span id="replace_aliases-203"><a href="#replace_aliases-203"><span class="linenos">203</span></a> <span class="k">else</span><span class="p">:</span>
</span><span id="replace_aliases-204"><a href="#replace_aliases-204"><span class="linenos">204</span></a> <span class="n">aliases</span><span class="p">[</span><span class="n">select</span><span class="o">.</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">select</span>
</span><span id="replace_aliases-205"><a href="#replace_aliases-205"><span class="linenos">205</span></a>
</span><span id="replace_aliases-206"><a href="#replace_aliases-206"><span class="linenos">206</span></a> <span class="k">def</span> <span class="nf">_replace_alias</span><span class="p">(</span><span class="n">column</span><span class="p">):</span>
</span><span id="replace_aliases-207"><a href="#replace_aliases-207"><span class="linenos">207</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">column</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="ow">and</span> <span class="n">column</span><span class="o">.</span><span class="n">name</span> <span class="ow">in</span> <span class="n">aliases</span><span class="p">:</span>
</span><span id="replace_aliases-208"><a href="#replace_aliases-208"><span class="linenos">208</span></a> <span class="k">return</span> <span class="n">aliases</span><span class="p">[</span><span class="n">column</span><span class="o">.</span><span class="n">name</span><span class="p">]</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span>
</span><span id="replace_aliases-209"><a href="#replace_aliases-209"><span class="linenos">209</span></a> <span class="k">return</span> <span class="n">column</span>
</span><span id="replace_aliases-210"><a href="#replace_aliases-210"><span class="linenos">210</span></a>
</span><span id="replace_aliases-211"><a href="#replace_aliases-211"><span class="linenos">211</span></a> <span class="k">return</span> <span class="n">predicate</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span><span class="n">_replace_alias</span><span class="p">)</span>
<div class="pdoc-code codehilite"><pre><span></span><span id="replace_aliases-184"><a href="#replace_aliases-184"><span class="linenos">184</span></a><span class="k">def</span> <span class="nf">replace_aliases</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">predicate</span><span class="p">):</span>
</span><span id="replace_aliases-185"><a href="#replace_aliases-185"><span class="linenos">185</span></a> <span class="n">aliases</span> <span class="o">=</span> <span class="p">{}</span>
</span><span id="replace_aliases-186"><a href="#replace_aliases-186"><span class="linenos">186</span></a>
</span><span id="replace_aliases-187"><a href="#replace_aliases-187"><span class="linenos">187</span></a> <span class="k">for</span> <span class="n">select</span> <span class="ow">in</span> <span class="n">source</span><span class="o">.</span><span class="n">selects</span><span class="p">:</span>
</span><span id="replace_aliases-188"><a href="#replace_aliases-188"><span class="linenos">188</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>
</span><span id="replace_aliases-189"><a href="#replace_aliases-189"><span class="linenos">189</span></a> <span class="n">aliases</span><span class="p">[</span><span class="n">select</span><span class="o">.</span><span class="n">alias</span><span class="p">]</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">this</span>
</span><span id="replace_aliases-190"><a href="#replace_aliases-190"><span class="linenos">190</span></a> <span class="k">else</span><span class="p">:</span>
</span><span id="replace_aliases-191"><a href="#replace_aliases-191"><span class="linenos">191</span></a> <span class="n">aliases</span><span class="p">[</span><span class="n">select</span><span class="o">.</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">select</span>
</span><span id="replace_aliases-192"><a href="#replace_aliases-192"><span class="linenos">192</span></a>
</span><span id="replace_aliases-193"><a href="#replace_aliases-193"><span class="linenos">193</span></a> <span class="k">def</span> <span class="nf">_replace_alias</span><span class="p">(</span><span class="n">column</span><span class="p">):</span>
</span><span id="replace_aliases-194"><a href="#replace_aliases-194"><span class="linenos">194</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">column</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="ow">and</span> <span class="n">column</span><span class="o">.</span><span class="n">name</span> <span class="ow">in</span> <span class="n">aliases</span><span class="p">:</span>
</span><span id="replace_aliases-195"><a href="#replace_aliases-195"><span class="linenos">195</span></a> <span class="k">return</span> <span class="n">aliases</span><span class="p">[</span><span class="n">column</span><span class="o">.</span><span class="n">name</span><span class="p">]</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span>
</span><span id="replace_aliases-196"><a href="#replace_aliases-196"><span class="linenos">196</span></a> <span class="k">return</span> <span class="n">column</span>
</span><span id="replace_aliases-197"><a href="#replace_aliases-197"><span class="linenos">197</span></a>
</span><span id="replace_aliases-198"><a href="#replace_aliases-198"><span class="linenos">198</span></a> <span class="k">return</span> <span class="n">predicate</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span><span class="n">_replace_alias</span><span class="p">)</span>
</span></pre></div>

2
docs/sqlglot/optimizer/pushdown_projections.html
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286
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@ -61,81 +61,93 @@
</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>
</span><span id="L-4"><a href="#L-4"><span class="linenos"> 4</span></a>
</span><span id="L-5"><a href="#L-5"><span class="linenos"> 5</span></a><span class="kn">from</span> <span class="nn">sqlglot</span> <span class="kn">import</span> <span class="n">exp</span>
</span><span id="L-6"><a href="#L-6"><span class="linenos"> 6</span></a><span class="kn">from</span> <span class="nn">sqlglot.dialects.dialect</span> <span class="kn">import</span> <span class="n">DialectType</span>
</span><span id="L-6"><a href="#L-6"><span class="linenos"> 6</span></a><span class="kn">from</span> <span class="nn">sqlglot.dialects.dialect</span> <span class="kn">import</span> <span class="n">Dialect</span><span class="p">,</span> <span class="n">DialectType</span>
</span><span id="L-7"><a href="#L-7"><span class="linenos"> 7</span></a><span class="kn">from</span> <span class="nn">sqlglot.optimizer.isolate_table_selects</span> <span class="kn">import</span> <span class="n">isolate_table_selects</span>
</span><span id="L-8"><a href="#L-8"><span class="linenos"> 8</span></a><span class="kn">from</span> <span class="nn">sqlglot.optimizer.normalize_identifiers</span> <span class="kn">import</span> <span class="n">normalize_identifiers</span>
</span><span id="L-9"><a href="#L-9"><span class="linenos"> 9</span></a><span class="kn">from</span> <span class="nn">sqlglot.optimizer.qualify_columns</span> <span class="kn">import</span> <span class="p">(</span>
</span><span id="L-10"><a href="#L-10"><span class="linenos">10</span></a> <span class="n">qualify_columns</span> <span class="k">as</span> <span class="n">qualify_columns_func</span><span class="p">,</span>
</span><span id="L-11"><a href="#L-11"><span class="linenos">11</span></a> <span class="n">quote_identifiers</span> <span class="k">as</span> <span class="n">quote_identifiers_func</span><span class="p">,</span>
</span><span id="L-12"><a href="#L-12"><span class="linenos">12</span></a> <span class="n">validate_qualify_columns</span> <span class="k">as</span> <span class="n">validate_qualify_columns_func</span><span class="p">,</span>
</span><span id="L-13"><a href="#L-13"><span class="linenos">13</span></a><span class="p">)</span>
</span><span id="L-14"><a href="#L-14"><span class="linenos">14</span></a><span class="kn">from</span> <span class="nn">sqlglot.optimizer.qualify_tables</span> <span class="kn">import</span> <span class="n">qualify_tables</span>
</span><span id="L-15"><a href="#L-15"><span class="linenos">15</span></a><span class="kn">from</span> <span class="nn">sqlglot.schema</span> <span class="kn">import</span> <span class="n">Schema</span><span class="p">,</span> <span class="n">ensure_schema</span>
</span><span id="L-16"><a href="#L-16"><span class="linenos">16</span></a>
</span><span id="L-10"><a href="#L-10"><span class="linenos">10</span></a> <span class="n">pushdown_cte_alias_columns</span> <span class="k">as</span> <span class="n">pushdown_cte_alias_columns_func</span><span class="p">,</span>
</span><span id="L-11"><a href="#L-11"><span class="linenos">11</span></a> <span class="n">qualify_columns</span> <span class="k">as</span> <span class="n">qualify_columns_func</span><span class="p">,</span>
</span><span id="L-12"><a href="#L-12"><span class="linenos">12</span></a> <span class="n">quote_identifiers</span> <span class="k">as</span> <span class="n">quote_identifiers_func</span><span class="p">,</span>
</span><span id="L-13"><a href="#L-13"><span class="linenos">13</span></a> <span class="n">validate_qualify_columns</span> <span class="k">as</span> <span class="n">validate_qualify_columns_func</span><span class="p">,</span>
</span><span id="L-14"><a href="#L-14"><span class="linenos">14</span></a><span class="p">)</span>
</span><span id="L-15"><a href="#L-15"><span class="linenos">15</span></a><span class="kn">from</span> <span class="nn">sqlglot.optimizer.qualify_tables</span> <span class="kn">import</span> <span class="n">qualify_tables</span>
</span><span id="L-16"><a href="#L-16"><span class="linenos">16</span></a><span class="kn">from</span> <span class="nn">sqlglot.schema</span> <span class="kn">import</span> <span class="n">Schema</span><span class="p">,</span> <span class="n">ensure_schema</span>
</span><span id="L-17"><a href="#L-17"><span class="linenos">17</span></a>
</span><span id="L-18"><a href="#L-18"><span class="linenos">18</span></a><span class="k">def</span> <span class="nf">qualify</span><span class="p">(</span>
</span><span id="L-19"><a href="#L-19"><span class="linenos">19</span></a> <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><span id="L-20"><a href="#L-20"><span class="linenos">20</span></a> <span class="n">dialect</span><span class="p">:</span> <span class="n">DialectType</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
</span><span id="L-21"><a href="#L-21"><span class="linenos">21</span></a> <span class="n">db</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
</span><span id="L-22"><a href="#L-22"><span class="linenos">22</span></a> <span class="n">catalog</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
</span><span id="L-23"><a href="#L-23"><span class="linenos">23</span></a> <span class="n">schema</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">dict</span> <span class="o">|</span> <span class="n">Schema</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
</span><span id="L-24"><a href="#L-24"><span class="linenos">24</span></a> <span class="n">expand_alias_refs</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
</span><span id="L-25"><a href="#L-25"><span class="linenos">25</span></a> <span class="n">infer_schema</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">bool</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
</span><span id="L-26"><a href="#L-26"><span class="linenos">26</span></a> <span class="n">isolate_tables</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">False</span><span class="p">,</span>
</span><span id="L-27"><a href="#L-27"><span class="linenos">27</span></a> <span class="n">qualify_columns</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
</span><span id="L-28"><a href="#L-28"><span class="linenos">28</span></a> <span class="n">validate_qualify_columns</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
</span><span id="L-29"><a href="#L-29"><span class="linenos">29</span></a> <span class="n">quote_identifiers</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
</span><span id="L-30"><a href="#L-30"><span class="linenos">30</span></a> <span class="n">identify</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
</span><span id="L-31"><a href="#L-31"><span class="linenos">31</span></a><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span>
</span><span id="L-32"><a href="#L-32"><span class="linenos">32</span></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="L-33"><a href="#L-33"><span class="linenos">33</span></a><span class="sd"> Rewrite sqlglot AST to have normalized and qualified tables and columns.</span>
</span><span id="L-34"><a href="#L-34"><span class="linenos">34</span></a>
</span><span id="L-35"><a href="#L-35"><span class="linenos">35</span></a><span class="sd"> This step is necessary for all further SQLGlot optimizations.</span>
</span><span id="L-18"><a href="#L-18"><span class="linenos">18</span></a>
</span><span id="L-19"><a href="#L-19"><span class="linenos">19</span></a><span class="k">def</span> <span class="nf">qualify</span><span class="p">(</span>
</span><span id="L-20"><a href="#L-20"><span class="linenos">20</span></a> <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><span id="L-21"><a href="#L-21"><span class="linenos">21</span></a> <span class="n">dialect</span><span class="p">:</span> <span class="n">DialectType</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
</span><span id="L-22"><a href="#L-22"><span class="linenos">22</span></a> <span class="n">db</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
</span><span id="L-23"><a href="#L-23"><span class="linenos">23</span></a> <span class="n">catalog</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
</span><span id="L-24"><a href="#L-24"><span class="linenos">24</span></a> <span class="n">schema</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">dict</span> <span class="o">|</span> <span class="n">Schema</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
</span><span id="L-25"><a href="#L-25"><span class="linenos">25</span></a> <span class="n">expand_alias_refs</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
</span><span id="L-26"><a href="#L-26"><span class="linenos">26</span></a> <span class="n">expand_stars</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
</span><span id="L-27"><a href="#L-27"><span class="linenos">27</span></a> <span class="n">infer_schema</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">bool</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
</span><span id="L-28"><a href="#L-28"><span class="linenos">28</span></a> <span class="n">isolate_tables</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">False</span><span class="p">,</span>
</span><span id="L-29"><a href="#L-29"><span class="linenos">29</span></a> <span class="n">qualify_columns</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
</span><span id="L-30"><a href="#L-30"><span class="linenos">30</span></a> <span class="n">validate_qualify_columns</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
</span><span id="L-31"><a href="#L-31"><span class="linenos">31</span></a> <span class="n">quote_identifiers</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
</span><span id="L-32"><a href="#L-32"><span class="linenos">32</span></a> <span class="n">identify</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
</span><span id="L-33"><a href="#L-33"><span class="linenos">33</span></a><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span>
</span><span id="L-34"><a href="#L-34"><span class="linenos">34</span></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="L-35"><a href="#L-35"><span class="linenos">35</span></a><span class="sd"> Rewrite sqlglot AST to have normalized and qualified tables and columns.</span>
</span><span id="L-36"><a href="#L-36"><span class="linenos">36</span></a>
</span><span id="L-37"><a href="#L-37"><span class="linenos">37</span></a><span class="sd"> Example:</span>
</span><span id="L-38"><a href="#L-38"><span class="linenos">38</span></a><span class="sd"> &gt;&gt;&gt; import sqlglot</span>
</span><span id="L-39"><a href="#L-39"><span class="linenos">39</span></a><span class="sd"> &gt;&gt;&gt; schema = {&quot;tbl&quot;: {&quot;col&quot;: &quot;INT&quot;}}</span>
</span><span id="L-40"><a href="#L-40"><span class="linenos">40</span></a><span class="sd"> &gt;&gt;&gt; expression = sqlglot.parse_one(&quot;SELECT col FROM tbl&quot;)</span>
</span><span id="L-41"><a href="#L-41"><span class="linenos">41</span></a><span class="sd"> &gt;&gt;&gt; qualify(expression, schema=schema).sql()</span>
</span><span id="L-42"><a href="#L-42"><span class="linenos">42</span></a><span class="sd"> &#39;SELECT &quot;tbl&quot;.&quot;col&quot; AS &quot;col&quot; FROM &quot;tbl&quot; AS &quot;tbl&quot;&#39;</span>
</span><span id="L-43"><a href="#L-43"><span class="linenos">43</span></a>
</span><span id="L-44"><a href="#L-44"><span class="linenos">44</span></a><span class="sd"> Args:</span>
</span><span id="L-45"><a href="#L-45"><span class="linenos">45</span></a><span class="sd"> expression: Expression to qualify.</span>
</span><span id="L-46"><a href="#L-46"><span class="linenos">46</span></a><span class="sd"> db: Default database name for tables.</span>
</span><span id="L-47"><a href="#L-47"><span class="linenos">47</span></a><span class="sd"> catalog: Default catalog name for tables.</span>
</span><span id="L-48"><a href="#L-48"><span class="linenos">48</span></a><span class="sd"> schema: Schema to infer column names and types.</span>
</span><span id="L-49"><a href="#L-49"><span class="linenos">49</span></a><span class="sd"> expand_alias_refs: Whether or not to expand references to aliases.</span>
</span><span id="L-50"><a href="#L-50"><span class="linenos">50</span></a><span class="sd"> infer_schema: Whether or not to infer the schema if missing.</span>
</span><span id="L-51"><a href="#L-51"><span class="linenos">51</span></a><span class="sd"> isolate_tables: Whether or not to isolate table selects.</span>
</span><span id="L-52"><a href="#L-52"><span class="linenos">52</span></a><span class="sd"> qualify_columns: Whether or not to qualify columns.</span>
</span><span id="L-53"><a href="#L-53"><span class="linenos">53</span></a><span class="sd"> validate_qualify_columns: Whether or not to validate columns.</span>
</span><span id="L-54"><a href="#L-54"><span class="linenos">54</span></a><span class="sd"> quote_identifiers: Whether or not to run the quote_identifiers step.</span>
</span><span id="L-55"><a href="#L-55"><span class="linenos">55</span></a><span class="sd"> This step is necessary to ensure correctness for case sensitive queries.</span>
</span><span id="L-56"><a href="#L-56"><span class="linenos">56</span></a><span class="sd"> But this flag is provided in case this step is performed at a later time.</span>
</span><span id="L-57"><a href="#L-57"><span class="linenos">57</span></a><span class="sd"> identify: If True, quote all identifiers, else only necessary ones.</span>
</span><span id="L-58"><a href="#L-58"><span class="linenos">58</span></a>
</span><span id="L-59"><a href="#L-59"><span class="linenos">59</span></a><span class="sd"> Returns:</span>
</span><span id="L-60"><a href="#L-60"><span class="linenos">60</span></a><span class="sd"> The qualified expression.</span>
</span><span id="L-61"><a href="#L-61"><span class="linenos">61</span></a><span class="sd"> &quot;&quot;&quot;</span>
</span><span id="L-62"><a href="#L-62"><span class="linenos">62</span></a> <span class="n">schema</span> <span class="o">=</span> <span class="n">ensure_schema</span><span class="p">(</span><span class="n">schema</span><span class="p">,</span> <span class="n">dialect</span><span class="o">=</span><span class="n">dialect</span><span class="p">)</span>
</span><span id="L-63"><a href="#L-63"><span class="linenos">63</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">normalize_identifiers</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dialect</span><span class="o">=</span><span class="n">dialect</span><span class="p">)</span>
</span><span id="L-64"><a href="#L-64"><span class="linenos">64</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">qualify_tables</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">db</span><span class="o">=</span><span class="n">db</span><span class="p">,</span> <span class="n">catalog</span><span class="o">=</span><span class="n">catalog</span><span class="p">,</span> <span class="n">schema</span><span class="o">=</span><span class="n">schema</span><span class="p">)</span>
</span><span id="L-65"><a href="#L-65"><span class="linenos">65</span></a>
</span><span id="L-66"><a href="#L-66"><span class="linenos">66</span></a> <span class="k">if</span> <span class="n">isolate_tables</span><span class="p">:</span>
</span><span id="L-67"><a href="#L-67"><span class="linenos">67</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">isolate_table_selects</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">schema</span><span class="o">=</span><span class="n">schema</span><span class="p">)</span>
</span><span id="L-68"><a href="#L-68"><span class="linenos">68</span></a>
</span><span id="L-69"><a href="#L-69"><span class="linenos">69</span></a> <span class="k">if</span> <span class="n">qualify_columns</span><span class="p">:</span>
</span><span id="L-70"><a href="#L-70"><span class="linenos">70</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">qualify_columns_func</span><span class="p">(</span>
</span><span id="L-71"><a href="#L-71"><span class="linenos">71</span></a> <span class="n">expression</span><span class="p">,</span> <span class="n">schema</span><span class="p">,</span> <span class="n">expand_alias_refs</span><span class="o">=</span><span class="n">expand_alias_refs</span><span class="p">,</span> <span class="n">infer_schema</span><span class="o">=</span><span class="n">infer_schema</span>
</span><span id="L-72"><a href="#L-72"><span class="linenos">72</span></a> <span class="p">)</span>
</span><span id="L-37"><a href="#L-37"><span class="linenos">37</span></a><span class="sd"> This step is necessary for all further SQLGlot optimizations.</span>
</span><span id="L-38"><a href="#L-38"><span class="linenos">38</span></a>
</span><span id="L-39"><a href="#L-39"><span class="linenos">39</span></a><span class="sd"> Example:</span>
</span><span id="L-40"><a href="#L-40"><span class="linenos">40</span></a><span class="sd"> &gt;&gt;&gt; import sqlglot</span>
</span><span id="L-41"><a href="#L-41"><span class="linenos">41</span></a><span class="sd"> &gt;&gt;&gt; schema = {&quot;tbl&quot;: {&quot;col&quot;: &quot;INT&quot;}}</span>
</span><span id="L-42"><a href="#L-42"><span class="linenos">42</span></a><span class="sd"> &gt;&gt;&gt; expression = sqlglot.parse_one(&quot;SELECT col FROM tbl&quot;)</span>
</span><span id="L-43"><a href="#L-43"><span class="linenos">43</span></a><span class="sd"> &gt;&gt;&gt; qualify(expression, schema=schema).sql()</span>
</span><span id="L-44"><a href="#L-44"><span class="linenos">44</span></a><span class="sd"> &#39;SELECT &quot;tbl&quot;.&quot;col&quot; AS &quot;col&quot; FROM &quot;tbl&quot; AS &quot;tbl&quot;&#39;</span>
</span><span id="L-45"><a href="#L-45"><span class="linenos">45</span></a>
</span><span id="L-46"><a href="#L-46"><span class="linenos">46</span></a><span class="sd"> Args:</span>
</span><span id="L-47"><a href="#L-47"><span class="linenos">47</span></a><span class="sd"> expression: Expression to qualify.</span>
</span><span id="L-48"><a href="#L-48"><span class="linenos">48</span></a><span class="sd"> db: Default database name for tables.</span>
</span><span id="L-49"><a href="#L-49"><span class="linenos">49</span></a><span class="sd"> catalog: Default catalog name for tables.</span>
</span><span id="L-50"><a href="#L-50"><span class="linenos">50</span></a><span class="sd"> schema: Schema to infer column names and types.</span>
</span><span id="L-51"><a href="#L-51"><span class="linenos">51</span></a><span class="sd"> expand_alias_refs: Whether or not to expand references to aliases.</span>
</span><span id="L-52"><a href="#L-52"><span class="linenos">52</span></a><span class="sd"> expand_stars: Whether or not to expand star queries. This is a necessary step</span>
</span><span id="L-53"><a href="#L-53"><span class="linenos">53</span></a><span class="sd"> for most of the optimizer&#39;s rules to work; do not set to False unless you</span>
</span><span id="L-54"><a href="#L-54"><span class="linenos">54</span></a><span class="sd"> know what you&#39;re doing!</span>
</span><span id="L-55"><a href="#L-55"><span class="linenos">55</span></a><span class="sd"> infer_schema: Whether or not to infer the schema if missing.</span>
</span><span id="L-56"><a href="#L-56"><span class="linenos">56</span></a><span class="sd"> isolate_tables: Whether or not to isolate table selects.</span>
</span><span id="L-57"><a href="#L-57"><span class="linenos">57</span></a><span class="sd"> qualify_columns: Whether or not to qualify columns.</span>
</span><span id="L-58"><a href="#L-58"><span class="linenos">58</span></a><span class="sd"> validate_qualify_columns: Whether or not to validate columns.</span>
</span><span id="L-59"><a href="#L-59"><span class="linenos">59</span></a><span class="sd"> quote_identifiers: Whether or not to run the quote_identifiers step.</span>
</span><span id="L-60"><a href="#L-60"><span class="linenos">60</span></a><span class="sd"> This step is necessary to ensure correctness for case sensitive queries.</span>
</span><span id="L-61"><a href="#L-61"><span class="linenos">61</span></a><span class="sd"> But this flag is provided in case this step is performed at a later time.</span>
</span><span id="L-62"><a href="#L-62"><span class="linenos">62</span></a><span class="sd"> identify: If True, quote all identifiers, else only necessary ones.</span>
</span><span id="L-63"><a href="#L-63"><span class="linenos">63</span></a>
</span><span id="L-64"><a href="#L-64"><span class="linenos">64</span></a><span class="sd"> Returns:</span>
</span><span id="L-65"><a href="#L-65"><span class="linenos">65</span></a><span class="sd"> The qualified expression.</span>
</span><span id="L-66"><a href="#L-66"><span class="linenos">66</span></a><span class="sd"> &quot;&quot;&quot;</span>
</span><span id="L-67"><a href="#L-67"><span class="linenos">67</span></a> <span class="n">schema</span> <span class="o">=</span> <span class="n">ensure_schema</span><span class="p">(</span><span class="n">schema</span><span class="p">,</span> <span class="n">dialect</span><span class="o">=</span><span class="n">dialect</span><span class="p">)</span>
</span><span id="L-68"><a href="#L-68"><span class="linenos">68</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">normalize_identifiers</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dialect</span><span class="o">=</span><span class="n">dialect</span><span class="p">)</span>
</span><span id="L-69"><a href="#L-69"><span class="linenos">69</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">qualify_tables</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">db</span><span class="o">=</span><span class="n">db</span><span class="p">,</span> <span class="n">catalog</span><span class="o">=</span><span class="n">catalog</span><span class="p">,</span> <span class="n">schema</span><span class="o">=</span><span class="n">schema</span><span class="p">)</span>
</span><span id="L-70"><a href="#L-70"><span class="linenos">70</span></a>
</span><span id="L-71"><a href="#L-71"><span class="linenos">71</span></a> <span class="k">if</span> <span class="n">isolate_tables</span><span class="p">:</span>
</span><span id="L-72"><a href="#L-72"><span class="linenos">72</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">isolate_table_selects</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">schema</span><span class="o">=</span><span class="n">schema</span><span class="p">)</span>
</span><span id="L-73"><a href="#L-73"><span class="linenos">73</span></a>
</span><span id="L-74"><a href="#L-74"><span class="linenos">74</span></a> <span class="k">if</span> <span class="n">quote_identifiers</span><span class="p">:</span>
</span><span id="L-75"><a href="#L-75"><span class="linenos">75</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">quote_identifiers_func</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dialect</span><span class="o">=</span><span class="n">dialect</span><span class="p">,</span> <span class="n">identify</span><span class="o">=</span><span class="n">identify</span><span class="p">)</span>
</span><span id="L-74"><a href="#L-74"><span class="linenos">74</span></a> <span class="k">if</span> <span class="n">Dialect</span><span class="o">.</span><span class="n">get_or_raise</span><span class="p">(</span><span class="n">dialect</span><span class="p">)</span><span class="o">.</span><span class="n">PREFER_CTE_ALIAS_COLUMN</span><span class="p">:</span>
</span><span id="L-75"><a href="#L-75"><span class="linenos">75</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">pushdown_cte_alias_columns_func</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
</span><span id="L-76"><a href="#L-76"><span class="linenos">76</span></a>
</span><span id="L-77"><a href="#L-77"><span class="linenos">77</span></a> <span class="k">if</span> <span class="n">validate_qualify_columns</span><span class="p">:</span>
</span><span id="L-78"><a href="#L-78"><span class="linenos">78</span></a> <span class="n">validate_qualify_columns_func</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
</span><span id="L-79"><a href="#L-79"><span class="linenos">79</span></a>
</span><span id="L-80"><a href="#L-80"><span class="linenos">80</span></a> <span class="k">return</span> <span class="n">expression</span>
</span><span id="L-77"><a href="#L-77"><span class="linenos">77</span></a> <span class="k">if</span> <span class="n">qualify_columns</span><span class="p">:</span>
</span><span id="L-78"><a href="#L-78"><span class="linenos">78</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">qualify_columns_func</span><span class="p">(</span>
</span><span id="L-79"><a href="#L-79"><span class="linenos">79</span></a> <span class="n">expression</span><span class="p">,</span>
</span><span id="L-80"><a href="#L-80"><span class="linenos">80</span></a> <span class="n">schema</span><span class="p">,</span>
</span><span id="L-81"><a href="#L-81"><span class="linenos">81</span></a> <span class="n">expand_alias_refs</span><span class="o">=</span><span class="n">expand_alias_refs</span><span class="p">,</span>
</span><span id="L-82"><a href="#L-82"><span class="linenos">82</span></a> <span class="n">expand_stars</span><span class="o">=</span><span class="n">expand_stars</span><span class="p">,</span>
</span><span id="L-83"><a href="#L-83"><span class="linenos">83</span></a> <span class="n">infer_schema</span><span class="o">=</span><span class="n">infer_schema</span><span class="p">,</span>
</span><span id="L-84"><a href="#L-84"><span class="linenos">84</span></a> <span class="p">)</span>
</span><span id="L-85"><a href="#L-85"><span class="linenos">85</span></a>
</span><span id="L-86"><a href="#L-86"><span class="linenos">86</span></a> <span class="k">if</span> <span class="n">quote_identifiers</span><span class="p">:</span>
</span><span id="L-87"><a href="#L-87"><span class="linenos">87</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">quote_identifiers_func</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dialect</span><span class="o">=</span><span class="n">dialect</span><span class="p">,</span> <span class="n">identify</span><span class="o">=</span><span class="n">identify</span><span class="p">)</span>
</span><span id="L-88"><a href="#L-88"><span class="linenos">88</span></a>
</span><span id="L-89"><a href="#L-89"><span class="linenos">89</span></a> <span class="k">if</span> <span class="n">validate_qualify_columns</span><span class="p">:</span>
</span><span id="L-90"><a href="#L-90"><span class="linenos">90</span></a> <span class="n">validate_qualify_columns_func</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
</span><span id="L-91"><a href="#L-91"><span class="linenos">91</span></a>
</span><span id="L-92"><a href="#L-92"><span class="linenos">92</span></a> <span class="k">return</span> <span class="n">expression</span>
</span></pre></div>
@ -145,75 +157,86 @@
<div class="attr function">
<span class="def">def</span>
<span class="name">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="param"> <span class="n">dialect</span><span class="p">:</span> <span class="n">Union</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n"><a href="../dialects/dialect.html#Dialect">sqlglot.dialects.dialect.Dialect</a></span><span class="p">,</span> <span class="n">Type</span><span class="p">[</span><span class="n"><a href="../dialects/dialect.html#Dialect">sqlglot.dialects.dialect.Dialect</a></span><span class="p">],</span> <span class="n">NoneType</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span>,</span><span class="param"> <span class="n">db</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span>,</span><span class="param"> <span class="n">catalog</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span>,</span><span class="param"> <span class="n">schema</span><span class="p">:</span> <span class="n">Union</span><span class="p">[</span><span class="nb">dict</span><span class="p">,</span> <span class="n"><a href="../schema.html#Schema">sqlglot.schema.Schema</a></span><span class="p">,</span> <span class="n">NoneType</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span>,</span><span class="param"> <span class="n">expand_alias_refs</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span>,</span><span class="param"> <span class="n">infer_schema</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">bool</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span>,</span><span class="param"> <span class="n">isolate_tables</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">False</span>,</span><span class="param"> <span class="n">qualify_columns</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span>,</span><span class="param"> <span class="n">validate_qualify_columns</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span>,</span><span class="param"> <span class="n">quote_identifiers</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span>,</span><span class="param"> <span class="n">identify</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span></span><span class="return-annotation">) -> <span class="n"><a href="../expressions.html#Expression">sqlglot.expressions.Expression</a></span>:</span></span>
<span class="name">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="param"> <span class="n">dialect</span><span class="p">:</span> <span class="n">Union</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n"><a href="../dialects/dialect.html#Dialect">sqlglot.dialects.dialect.Dialect</a></span><span class="p">,</span> <span class="n">Type</span><span class="p">[</span><span class="n"><a href="../dialects/dialect.html#Dialect">sqlglot.dialects.dialect.Dialect</a></span><span class="p">],</span> <span class="n">NoneType</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span>,</span><span class="param"> <span class="n">db</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span>,</span><span class="param"> <span class="n">catalog</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span>,</span><span class="param"> <span class="n">schema</span><span class="p">:</span> <span class="n">Union</span><span class="p">[</span><span class="nb">dict</span><span class="p">,</span> <span class="n"><a href="../schema.html#Schema">sqlglot.schema.Schema</a></span><span class="p">,</span> <span class="n">NoneType</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span>,</span><span class="param"> <span class="n">expand_alias_refs</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span>,</span><span class="param"> <span class="n">expand_stars</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span>,</span><span class="param"> <span class="n">infer_schema</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">bool</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span>,</span><span class="param"> <span class="n">isolate_tables</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">False</span>,</span><span class="param"> <span class="n">qualify_columns</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span>,</span><span class="param"> <span class="n">validate_qualify_columns</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span>,</span><span class="param"> <span class="n">quote_identifiers</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span>,</span><span class="param"> <span class="n">identify</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</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="qualify-view-source"><span>View Source</span></label>
</div>
<a class="headerlink" href="#qualify"></a>
<div class="pdoc-code codehilite"><pre><span></span><span id="qualify-19"><a href="#qualify-19"><span class="linenos">19</span></a><span class="k">def</span> <span class="nf">qualify</span><span class="p">(</span>
</span><span id="qualify-20"><a href="#qualify-20"><span class="linenos">20</span></a> <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><span id="qualify-21"><a href="#qualify-21"><span class="linenos">21</span></a> <span class="n">dialect</span><span class="p">:</span> <span class="n">DialectType</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
</span><span id="qualify-22"><a href="#qualify-22"><span class="linenos">22</span></a> <span class="n">db</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
</span><span id="qualify-23"><a href="#qualify-23"><span class="linenos">23</span></a> <span class="n">catalog</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
</span><span id="qualify-24"><a href="#qualify-24"><span class="linenos">24</span></a> <span class="n">schema</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">dict</span> <span class="o">|</span> <span class="n">Schema</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
</span><span id="qualify-25"><a href="#qualify-25"><span class="linenos">25</span></a> <span class="n">expand_alias_refs</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
</span><span id="qualify-26"><a href="#qualify-26"><span class="linenos">26</span></a> <span class="n">infer_schema</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">bool</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
</span><span id="qualify-27"><a href="#qualify-27"><span class="linenos">27</span></a> <span class="n">isolate_tables</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">False</span><span class="p">,</span>
</span><span id="qualify-28"><a href="#qualify-28"><span class="linenos">28</span></a> <span class="n">qualify_columns</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
</span><span id="qualify-29"><a href="#qualify-29"><span class="linenos">29</span></a> <span class="n">validate_qualify_columns</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
</span><span id="qualify-30"><a href="#qualify-30"><span class="linenos">30</span></a> <span class="n">quote_identifiers</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
</span><span id="qualify-31"><a href="#qualify-31"><span class="linenos">31</span></a> <span class="n">identify</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
</span><span id="qualify-32"><a href="#qualify-32"><span class="linenos">32</span></a><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span>
</span><span id="qualify-33"><a href="#qualify-33"><span class="linenos">33</span></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="qualify-34"><a href="#qualify-34"><span class="linenos">34</span></a><span class="sd"> Rewrite sqlglot AST to have normalized and qualified tables and columns.</span>
</span><span id="qualify-35"><a href="#qualify-35"><span class="linenos">35</span></a>
</span><span id="qualify-36"><a href="#qualify-36"><span class="linenos">36</span></a><span class="sd"> This step is necessary for all further SQLGlot optimizations.</span>
<div class="pdoc-code codehilite"><pre><span></span><span id="qualify-20"><a href="#qualify-20"><span class="linenos">20</span></a><span class="k">def</span> <span class="nf">qualify</span><span class="p">(</span>
</span><span id="qualify-21"><a href="#qualify-21"><span class="linenos">21</span></a> <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><span id="qualify-22"><a href="#qualify-22"><span class="linenos">22</span></a> <span class="n">dialect</span><span class="p">:</span> <span class="n">DialectType</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
</span><span id="qualify-23"><a href="#qualify-23"><span class="linenos">23</span></a> <span class="n">db</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
</span><span id="qualify-24"><a href="#qualify-24"><span class="linenos">24</span></a> <span class="n">catalog</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
</span><span id="qualify-25"><a href="#qualify-25"><span class="linenos">25</span></a> <span class="n">schema</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">dict</span> <span class="o">|</span> <span class="n">Schema</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
</span><span id="qualify-26"><a href="#qualify-26"><span class="linenos">26</span></a> <span class="n">expand_alias_refs</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
</span><span id="qualify-27"><a href="#qualify-27"><span class="linenos">27</span></a> <span class="n">expand_stars</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
</span><span id="qualify-28"><a href="#qualify-28"><span class="linenos">28</span></a> <span class="n">infer_schema</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">bool</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
</span><span id="qualify-29"><a href="#qualify-29"><span class="linenos">29</span></a> <span class="n">isolate_tables</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">False</span><span class="p">,</span>
</span><span id="qualify-30"><a href="#qualify-30"><span class="linenos">30</span></a> <span class="n">qualify_columns</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
</span><span id="qualify-31"><a href="#qualify-31"><span class="linenos">31</span></a> <span class="n">validate_qualify_columns</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
</span><span id="qualify-32"><a href="#qualify-32"><span class="linenos">32</span></a> <span class="n">quote_identifiers</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
</span><span id="qualify-33"><a href="#qualify-33"><span class="linenos">33</span></a> <span class="n">identify</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
</span><span id="qualify-34"><a href="#qualify-34"><span class="linenos">34</span></a><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span>
</span><span id="qualify-35"><a href="#qualify-35"><span class="linenos">35</span></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="qualify-36"><a href="#qualify-36"><span class="linenos">36</span></a><span class="sd"> Rewrite sqlglot AST to have normalized and qualified tables and columns.</span>
</span><span id="qualify-37"><a href="#qualify-37"><span class="linenos">37</span></a>
</span><span id="qualify-38"><a href="#qualify-38"><span class="linenos">38</span></a><span class="sd"> Example:</span>
</span><span id="qualify-39"><a href="#qualify-39"><span class="linenos">39</span></a><span class="sd"> &gt;&gt;&gt; import sqlglot</span>
</span><span id="qualify-40"><a href="#qualify-40"><span class="linenos">40</span></a><span class="sd"> &gt;&gt;&gt; schema = {&quot;tbl&quot;: {&quot;col&quot;: &quot;INT&quot;}}</span>
</span><span id="qualify-41"><a href="#qualify-41"><span class="linenos">41</span></a><span class="sd"> &gt;&gt;&gt; expression = sqlglot.parse_one(&quot;SELECT col FROM tbl&quot;)</span>
</span><span id="qualify-42"><a href="#qualify-42"><span class="linenos">42</span></a><span class="sd"> &gt;&gt;&gt; qualify(expression, schema=schema).sql()</span>
</span><span id="qualify-43"><a href="#qualify-43"><span class="linenos">43</span></a><span class="sd"> &#39;SELECT &quot;tbl&quot;.&quot;col&quot; AS &quot;col&quot; FROM &quot;tbl&quot; AS &quot;tbl&quot;&#39;</span>
</span><span id="qualify-44"><a href="#qualify-44"><span class="linenos">44</span></a>
</span><span id="qualify-45"><a href="#qualify-45"><span class="linenos">45</span></a><span class="sd"> Args:</span>
</span><span id="qualify-46"><a href="#qualify-46"><span class="linenos">46</span></a><span class="sd"> expression: Expression to qualify.</span>
</span><span id="qualify-47"><a href="#qualify-47"><span class="linenos">47</span></a><span class="sd"> db: Default database name for tables.</span>
</span><span id="qualify-48"><a href="#qualify-48"><span class="linenos">48</span></a><span class="sd"> catalog: Default catalog name for tables.</span>
</span><span id="qualify-49"><a href="#qualify-49"><span class="linenos">49</span></a><span class="sd"> schema: Schema to infer column names and types.</span>
</span><span id="qualify-50"><a href="#qualify-50"><span class="linenos">50</span></a><span class="sd"> expand_alias_refs: Whether or not to expand references to aliases.</span>
</span><span id="qualify-51"><a href="#qualify-51"><span class="linenos">51</span></a><span class="sd"> infer_schema: Whether or not to infer the schema if missing.</span>
</span><span id="qualify-52"><a href="#qualify-52"><span class="linenos">52</span></a><span class="sd"> isolate_tables: Whether or not to isolate table selects.</span>
</span><span id="qualify-53"><a href="#qualify-53"><span class="linenos">53</span></a><span class="sd"> qualify_columns: Whether or not to qualify columns.</span>
</span><span id="qualify-54"><a href="#qualify-54"><span class="linenos">54</span></a><span class="sd"> validate_qualify_columns: Whether or not to validate columns.</span>
</span><span id="qualify-55"><a href="#qualify-55"><span class="linenos">55</span></a><span class="sd"> quote_identifiers: Whether or not to run the quote_identifiers step.</span>
</span><span id="qualify-56"><a href="#qualify-56"><span class="linenos">56</span></a><span class="sd"> This step is necessary to ensure correctness for case sensitive queries.</span>
</span><span id="qualify-57"><a href="#qualify-57"><span class="linenos">57</span></a><span class="sd"> But this flag is provided in case this step is performed at a later time.</span>
</span><span id="qualify-58"><a href="#qualify-58"><span class="linenos">58</span></a><span class="sd"> identify: If True, quote all identifiers, else only necessary ones.</span>
</span><span id="qualify-59"><a href="#qualify-59"><span class="linenos">59</span></a>
</span><span id="qualify-60"><a href="#qualify-60"><span class="linenos">60</span></a><span class="sd"> Returns:</span>
</span><span id="qualify-61"><a href="#qualify-61"><span class="linenos">61</span></a><span class="sd"> The qualified expression.</span>
</span><span id="qualify-62"><a href="#qualify-62"><span class="linenos">62</span></a><span class="sd"> &quot;&quot;&quot;</span>
</span><span id="qualify-63"><a href="#qualify-63"><span class="linenos">63</span></a> <span class="n">schema</span> <span class="o">=</span> <span class="n">ensure_schema</span><span class="p">(</span><span class="n">schema</span><span class="p">,</span> <span class="n">dialect</span><span class="o">=</span><span class="n">dialect</span><span class="p">)</span>
</span><span id="qualify-64"><a href="#qualify-64"><span class="linenos">64</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">normalize_identifiers</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dialect</span><span class="o">=</span><span class="n">dialect</span><span class="p">)</span>
</span><span id="qualify-65"><a href="#qualify-65"><span class="linenos">65</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">qualify_tables</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">db</span><span class="o">=</span><span class="n">db</span><span class="p">,</span> <span class="n">catalog</span><span class="o">=</span><span class="n">catalog</span><span class="p">,</span> <span class="n">schema</span><span class="o">=</span><span class="n">schema</span><span class="p">)</span>
</span><span id="qualify-66"><a href="#qualify-66"><span class="linenos">66</span></a>
</span><span id="qualify-67"><a href="#qualify-67"><span class="linenos">67</span></a> <span class="k">if</span> <span class="n">isolate_tables</span><span class="p">:</span>
</span><span id="qualify-68"><a href="#qualify-68"><span class="linenos">68</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">isolate_table_selects</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">schema</span><span class="o">=</span><span class="n">schema</span><span class="p">)</span>
</span><span id="qualify-69"><a href="#qualify-69"><span class="linenos">69</span></a>
</span><span id="qualify-70"><a href="#qualify-70"><span class="linenos">70</span></a> <span class="k">if</span> <span class="n">qualify_columns</span><span class="p">:</span>
</span><span id="qualify-71"><a href="#qualify-71"><span class="linenos">71</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">qualify_columns_func</span><span class="p">(</span>
</span><span id="qualify-72"><a href="#qualify-72"><span class="linenos">72</span></a> <span class="n">expression</span><span class="p">,</span> <span class="n">schema</span><span class="p">,</span> <span class="n">expand_alias_refs</span><span class="o">=</span><span class="n">expand_alias_refs</span><span class="p">,</span> <span class="n">infer_schema</span><span class="o">=</span><span class="n">infer_schema</span>
</span><span id="qualify-73"><a href="#qualify-73"><span class="linenos">73</span></a> <span class="p">)</span>
</span><span id="qualify-38"><a href="#qualify-38"><span class="linenos">38</span></a><span class="sd"> This step is necessary for all further SQLGlot optimizations.</span>
</span><span id="qualify-39"><a href="#qualify-39"><span class="linenos">39</span></a>
</span><span id="qualify-40"><a href="#qualify-40"><span class="linenos">40</span></a><span class="sd"> Example:</span>
</span><span id="qualify-41"><a href="#qualify-41"><span class="linenos">41</span></a><span class="sd"> &gt;&gt;&gt; import sqlglot</span>
</span><span id="qualify-42"><a href="#qualify-42"><span class="linenos">42</span></a><span class="sd"> &gt;&gt;&gt; schema = {&quot;tbl&quot;: {&quot;col&quot;: &quot;INT&quot;}}</span>
</span><span id="qualify-43"><a href="#qualify-43"><span class="linenos">43</span></a><span class="sd"> &gt;&gt;&gt; expression = sqlglot.parse_one(&quot;SELECT col FROM tbl&quot;)</span>
</span><span id="qualify-44"><a href="#qualify-44"><span class="linenos">44</span></a><span class="sd"> &gt;&gt;&gt; qualify(expression, schema=schema).sql()</span>
</span><span id="qualify-45"><a href="#qualify-45"><span class="linenos">45</span></a><span class="sd"> &#39;SELECT &quot;tbl&quot;.&quot;col&quot; AS &quot;col&quot; FROM &quot;tbl&quot; AS &quot;tbl&quot;&#39;</span>
</span><span id="qualify-46"><a href="#qualify-46"><span class="linenos">46</span></a>
</span><span id="qualify-47"><a href="#qualify-47"><span class="linenos">47</span></a><span class="sd"> Args:</span>
</span><span id="qualify-48"><a href="#qualify-48"><span class="linenos">48</span></a><span class="sd"> expression: Expression to qualify.</span>
</span><span id="qualify-49"><a href="#qualify-49"><span class="linenos">49</span></a><span class="sd"> db: Default database name for tables.</span>
</span><span id="qualify-50"><a href="#qualify-50"><span class="linenos">50</span></a><span class="sd"> catalog: Default catalog name for tables.</span>
</span><span id="qualify-51"><a href="#qualify-51"><span class="linenos">51</span></a><span class="sd"> schema: Schema to infer column names and types.</span>
</span><span id="qualify-52"><a href="#qualify-52"><span class="linenos">52</span></a><span class="sd"> expand_alias_refs: Whether or not to expand references to aliases.</span>
</span><span id="qualify-53"><a href="#qualify-53"><span class="linenos">53</span></a><span class="sd"> expand_stars: Whether or not to expand star queries. This is a necessary step</span>
</span><span id="qualify-54"><a href="#qualify-54"><span class="linenos">54</span></a><span class="sd"> for most of the optimizer&#39;s rules to work; do not set to False unless you</span>
</span><span id="qualify-55"><a href="#qualify-55"><span class="linenos">55</span></a><span class="sd"> know what you&#39;re doing!</span>
</span><span id="qualify-56"><a href="#qualify-56"><span class="linenos">56</span></a><span class="sd"> infer_schema: Whether or not to infer the schema if missing.</span>
</span><span id="qualify-57"><a href="#qualify-57"><span class="linenos">57</span></a><span class="sd"> isolate_tables: Whether or not to isolate table selects.</span>
</span><span id="qualify-58"><a href="#qualify-58"><span class="linenos">58</span></a><span class="sd"> qualify_columns: Whether or not to qualify columns.</span>
</span><span id="qualify-59"><a href="#qualify-59"><span class="linenos">59</span></a><span class="sd"> validate_qualify_columns: Whether or not to validate columns.</span>
</span><span id="qualify-60"><a href="#qualify-60"><span class="linenos">60</span></a><span class="sd"> quote_identifiers: Whether or not to run the quote_identifiers step.</span>
</span><span id="qualify-61"><a href="#qualify-61"><span class="linenos">61</span></a><span class="sd"> This step is necessary to ensure correctness for case sensitive queries.</span>
</span><span id="qualify-62"><a href="#qualify-62"><span class="linenos">62</span></a><span class="sd"> But this flag is provided in case this step is performed at a later time.</span>
</span><span id="qualify-63"><a href="#qualify-63"><span class="linenos">63</span></a><span class="sd"> identify: If True, quote all identifiers, else only necessary ones.</span>
</span><span id="qualify-64"><a href="#qualify-64"><span class="linenos">64</span></a>
</span><span id="qualify-65"><a href="#qualify-65"><span class="linenos">65</span></a><span class="sd"> Returns:</span>
</span><span id="qualify-66"><a href="#qualify-66"><span class="linenos">66</span></a><span class="sd"> The qualified expression.</span>
</span><span id="qualify-67"><a href="#qualify-67"><span class="linenos">67</span></a><span class="sd"> &quot;&quot;&quot;</span>
</span><span id="qualify-68"><a href="#qualify-68"><span class="linenos">68</span></a> <span class="n">schema</span> <span class="o">=</span> <span class="n">ensure_schema</span><span class="p">(</span><span class="n">schema</span><span class="p">,</span> <span class="n">dialect</span><span class="o">=</span><span class="n">dialect</span><span class="p">)</span>
</span><span id="qualify-69"><a href="#qualify-69"><span class="linenos">69</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">normalize_identifiers</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dialect</span><span class="o">=</span><span class="n">dialect</span><span class="p">)</span>
</span><span id="qualify-70"><a href="#qualify-70"><span class="linenos">70</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">qualify_tables</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">db</span><span class="o">=</span><span class="n">db</span><span class="p">,</span> <span class="n">catalog</span><span class="o">=</span><span class="n">catalog</span><span class="p">,</span> <span class="n">schema</span><span class="o">=</span><span class="n">schema</span><span class="p">)</span>
</span><span id="qualify-71"><a href="#qualify-71"><span class="linenos">71</span></a>
</span><span id="qualify-72"><a href="#qualify-72"><span class="linenos">72</span></a> <span class="k">if</span> <span class="n">isolate_tables</span><span class="p">:</span>
</span><span id="qualify-73"><a href="#qualify-73"><span class="linenos">73</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">isolate_table_selects</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">schema</span><span class="o">=</span><span class="n">schema</span><span class="p">)</span>
</span><span id="qualify-74"><a href="#qualify-74"><span class="linenos">74</span></a>
</span><span id="qualify-75"><a href="#qualify-75"><span class="linenos">75</span></a> <span class="k">if</span> <span class="n">quote_identifiers</span><span class="p">:</span>
</span><span id="qualify-76"><a href="#qualify-76"><span class="linenos">76</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">quote_identifiers_func</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dialect</span><span class="o">=</span><span class="n">dialect</span><span class="p">,</span> <span class="n">identify</span><span class="o">=</span><span class="n">identify</span><span class="p">)</span>
</span><span id="qualify-75"><a href="#qualify-75"><span class="linenos">75</span></a> <span class="k">if</span> <span class="n">Dialect</span><span class="o">.</span><span class="n">get_or_raise</span><span class="p">(</span><span class="n">dialect</span><span class="p">)</span><span class="o">.</span><span class="n">PREFER_CTE_ALIAS_COLUMN</span><span class="p">:</span>
</span><span id="qualify-76"><a href="#qualify-76"><span class="linenos">76</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">pushdown_cte_alias_columns_func</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
</span><span id="qualify-77"><a href="#qualify-77"><span class="linenos">77</span></a>
</span><span id="qualify-78"><a href="#qualify-78"><span class="linenos">78</span></a> <span class="k">if</span> <span class="n">validate_qualify_columns</span><span class="p">:</span>
</span><span id="qualify-79"><a href="#qualify-79"><span class="linenos">79</span></a> <span class="n">validate_qualify_columns_func</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
</span><span id="qualify-80"><a href="#qualify-80"><span class="linenos">80</span></a>
</span><span id="qualify-81"><a href="#qualify-81"><span class="linenos">81</span></a> <span class="k">return</span> <span class="n">expression</span>
</span><span id="qualify-78"><a href="#qualify-78"><span class="linenos">78</span></a> <span class="k">if</span> <span class="n">qualify_columns</span><span class="p">:</span>
</span><span id="qualify-79"><a href="#qualify-79"><span class="linenos">79</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">qualify_columns_func</span><span class="p">(</span>
</span><span id="qualify-80"><a href="#qualify-80"><span class="linenos">80</span></a> <span class="n">expression</span><span class="p">,</span>
</span><span id="qualify-81"><a href="#qualify-81"><span class="linenos">81</span></a> <span class="n">schema</span><span class="p">,</span>
</span><span id="qualify-82"><a href="#qualify-82"><span class="linenos">82</span></a> <span class="n">expand_alias_refs</span><span class="o">=</span><span class="n">expand_alias_refs</span><span class="p">,</span>
</span><span id="qualify-83"><a href="#qualify-83"><span class="linenos">83</span></a> <span class="n">expand_stars</span><span class="o">=</span><span class="n">expand_stars</span><span class="p">,</span>
</span><span id="qualify-84"><a href="#qualify-84"><span class="linenos">84</span></a> <span class="n">infer_schema</span><span class="o">=</span><span class="n">infer_schema</span><span class="p">,</span>
</span><span id="qualify-85"><a href="#qualify-85"><span class="linenos">85</span></a> <span class="p">)</span>
</span><span id="qualify-86"><a href="#qualify-86"><span class="linenos">86</span></a>
</span><span id="qualify-87"><a href="#qualify-87"><span class="linenos">87</span></a> <span class="k">if</span> <span class="n">quote_identifiers</span><span class="p">:</span>
</span><span id="qualify-88"><a href="#qualify-88"><span class="linenos">88</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">quote_identifiers_func</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">dialect</span><span class="o">=</span><span class="n">dialect</span><span class="p">,</span> <span class="n">identify</span><span class="o">=</span><span class="n">identify</span><span class="p">)</span>
</span><span id="qualify-89"><a href="#qualify-89"><span class="linenos">89</span></a>
</span><span id="qualify-90"><a href="#qualify-90"><span class="linenos">90</span></a> <span class="k">if</span> <span class="n">validate_qualify_columns</span><span class="p">:</span>
</span><span id="qualify-91"><a href="#qualify-91"><span class="linenos">91</span></a> <span class="n">validate_qualify_columns_func</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span>
</span><span id="qualify-92"><a href="#qualify-92"><span class="linenos">92</span></a>
</span><span id="qualify-93"><a href="#qualify-93"><span class="linenos">93</span></a> <span class="k">return</span> <span class="n">expression</span>
</span></pre></div>
@ -242,6 +265,9 @@
<li><strong>catalog:</strong> Default catalog name for tables.</li>
<li><strong>schema:</strong> Schema to infer column names and types.</li>
<li><strong>expand_alias_refs:</strong> Whether or not to expand references to aliases.</li>
<li><strong>expand_stars:</strong> Whether or not to expand star queries. This is a necessary step
for most of the optimizer's rules to work; do not set to False unless you
know what you're doing!</li>
<li><strong>infer_schema:</strong> Whether or not to infer the schema if missing.</li>
<li><strong>isolate_tables:</strong> Whether or not to isolate table selects.</li>
<li><strong>qualify_columns:</strong> Whether or not to qualify columns.</li>

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