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Diffstat (limited to 'docs/sqlglot/optimizer/pushdown_projections.html')
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1 files changed, 74 insertions, 68 deletions
diff --git a/docs/sqlglot/optimizer/pushdown_projections.html b/docs/sqlglot/optimizer/pushdown_projections.html index 41bace3..6b6e52a 100644 --- a/docs/sqlglot/optimizer/pushdown_projections.html +++ b/docs/sqlglot/optimizer/pushdown_projections.html @@ -125,63 +125,66 @@ </span><span id="L-61"><a href="#L-61"><span class="linenos"> 61</span></a> <span class="k">if</span> <span class="n">remove_unused_selections</span><span class="p">:</span> </span><span id="L-62"><a href="#L-62"><span class="linenos"> 62</span></a> <span class="n">_remove_unused_selections</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">parent_selections</span><span class="p">,</span> <span class="n">schema</span><span class="p">)</span> </span><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="c1"># Group columns by source name</span> -</span><span id="L-65"><a href="#L-65"><span class="linenos"> 65</span></a> <span class="n">selects</span> <span class="o">=</span> <span class="n">defaultdict</span><span class="p">(</span><span class="nb">set</span><span class="p">)</span> -</span><span id="L-66"><a href="#L-66"><span class="linenos"> 66</span></a> <span class="k">for</span> <span class="n">col</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">columns</span><span class="p">:</span> -</span><span id="L-67"><a href="#L-67"><span class="linenos"> 67</span></a> <span class="n">table_name</span> <span class="o">=</span> <span class="n">col</span><span class="o">.</span><span class="n">table</span> -</span><span id="L-68"><a href="#L-68"><span class="linenos"> 68</span></a> <span class="n">col_name</span> <span class="o">=</span> <span class="n">col</span><span class="o">.</span><span class="n">name</span> -</span><span id="L-69"><a href="#L-69"><span class="linenos"> 69</span></a> <span class="n">selects</span><span class="p">[</span><span class="n">table_name</span><span class="p">]</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">col_name</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="c1"># Push the selected columns down to the next scope</span> -</span><span id="L-72"><a href="#L-72"><span class="linenos"> 72</span></a> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="p">(</span><span class="n">_</span><span class="p">,</span> <span class="n">source</span><span class="p">)</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="o">.</span><span class="n">items</span><span class="p">():</span> -</span><span id="L-73"><a href="#L-73"><span class="linenos"> 73</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">Scope</span><span class="p">):</span> -</span><span id="L-74"><a href="#L-74"><span class="linenos"> 74</span></a> <span class="n">columns</span> <span class="o">=</span> <span class="n">selects</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">name</span><span class="p">)</span> <span class="ow">or</span> <span class="nb">set</span><span class="p">()</span> -</span><span id="L-75"><a href="#L-75"><span class="linenos"> 75</span></a> <span class="n">referenced_columns</span><span class="p">[</span><span class="n">source</span><span class="p">]</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">columns</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">return</span> <span class="n">expression</span> -</span><span id="L-78"><a href="#L-78"><span class="linenos"> 78</span></a> +</span><span id="L-64"><a href="#L-64"><span class="linenos"> 64</span></a> <span class="k">if</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">is_star</span><span class="p">:</span> +</span><span id="L-65"><a href="#L-65"><span class="linenos"> 65</span></a> <span class="k">continue</span> +</span><span id="L-66"><a href="#L-66"><span class="linenos"> 66</span></a> +</span><span id="L-67"><a href="#L-67"><span class="linenos"> 67</span></a> <span class="c1"># Group columns by source name</span> +</span><span id="L-68"><a href="#L-68"><span class="linenos"> 68</span></a> <span class="n">selects</span> <span class="o">=</span> <span class="n">defaultdict</span><span class="p">(</span><span class="nb">set</span><span class="p">)</span> +</span><span id="L-69"><a href="#L-69"><span class="linenos"> 69</span></a> <span class="k">for</span> <span class="n">col</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">columns</span><span class="p">:</span> +</span><span id="L-70"><a href="#L-70"><span class="linenos"> 70</span></a> <span class="n">table_name</span> <span class="o">=</span> <span class="n">col</span><span class="o">.</span><span class="n">table</span> +</span><span id="L-71"><a href="#L-71"><span class="linenos"> 71</span></a> <span class="n">col_name</span> <span class="o">=</span> <span class="n">col</span><span class="o">.</span><span class="n">name</span> +</span><span id="L-72"><a href="#L-72"><span class="linenos"> 72</span></a> <span class="n">selects</span><span class="p">[</span><span class="n">table_name</span><span class="p">]</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">col_name</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="c1"># Push the selected columns down to the next scope</span> +</span><span id="L-75"><a href="#L-75"><span class="linenos"> 75</span></a> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="p">(</span><span class="n">_</span><span class="p">,</span> <span class="n">source</span><span class="p">)</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="o">.</span><span class="n">items</span><span class="p">():</span> +</span><span id="L-76"><a href="#L-76"><span class="linenos"> 76</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">Scope</span><span class="p">):</span> +</span><span id="L-77"><a href="#L-77"><span class="linenos"> 77</span></a> <span class="n">columns</span> <span class="o">=</span> <span class="n">selects</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">name</span><span class="p">)</span> <span class="ow">or</span> <span class="nb">set</span><span class="p">()</span> +</span><span id="L-78"><a href="#L-78"><span class="linenos"> 78</span></a> <span class="n">referenced_columns</span><span class="p">[</span><span class="n">source</span><span class="p">]</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">columns</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">def</span> <span class="nf">_remove_unused_selections</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">parent_selections</span><span class="p">,</span> <span class="n">schema</span><span class="p">):</span> -</span><span id="L-81"><a href="#L-81"><span class="linenos"> 81</span></a> <span class="n">order</span> <span class="o">=</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"order"</span><span class="p">)</span> +</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-81"><a href="#L-81"><span class="linenos"> 81</span></a> </span><span id="L-82"><a href="#L-82"><span class="linenos"> 82</span></a> -</span><span id="L-83"><a href="#L-83"><span class="linenos"> 83</span></a> <span class="k">if</span> <span class="n">order</span><span class="p">:</span> -</span><span id="L-84"><a href="#L-84"><span class="linenos"> 84</span></a> <span class="c1"># Assume columns without a qualified table are references to output columns</span> -</span><span id="L-85"><a href="#L-85"><span class="linenos"> 85</span></a> <span class="n">order_refs</span> <span class="o">=</span> <span class="p">{</span><span class="n">c</span><span class="o">.</span><span class="n">name</span> <span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="n">order</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">)</span> <span class="k">if</span> <span class="ow">not</span> <span class="n">c</span><span class="o">.</span><span class="n">table</span><span class="p">}</span> -</span><span id="L-86"><a href="#L-86"><span class="linenos"> 86</span></a> <span class="k">else</span><span class="p">:</span> -</span><span id="L-87"><a href="#L-87"><span class="linenos"> 87</span></a> <span class="n">order_refs</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span> -</span><span id="L-88"><a href="#L-88"><span class="linenos"> 88</span></a> -</span><span id="L-89"><a href="#L-89"><span class="linenos"> 89</span></a> <span class="n">new_selections</span> <span class="o">=</span> <span class="p">[]</span> -</span><span id="L-90"><a href="#L-90"><span class="linenos"> 90</span></a> <span class="n">removed</span> <span class="o">=</span> <span class="kc">False</span> -</span><span id="L-91"><a href="#L-91"><span class="linenos"> 91</span></a> <span class="n">star</span> <span class="o">=</span> <span class="kc">False</span> -</span><span id="L-92"><a href="#L-92"><span class="linenos"> 92</span></a> -</span><span id="L-93"><a href="#L-93"><span class="linenos"> 93</span></a> <span class="k">for</span> <span class="n">selection</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">selects</span><span class="p">:</span> -</span><span id="L-94"><a href="#L-94"><span class="linenos"> 94</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">selection</span><span class="o">.</span><span class="n">alias_or_name</span> +</span><span id="L-83"><a href="#L-83"><span class="linenos"> 83</span></a><span class="k">def</span> <span class="nf">_remove_unused_selections</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">parent_selections</span><span class="p">,</span> <span class="n">schema</span><span class="p">):</span> +</span><span id="L-84"><a href="#L-84"><span class="linenos"> 84</span></a> <span class="n">order</span> <span class="o">=</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"order"</span><span class="p">)</span> +</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">order</span><span class="p">:</span> +</span><span id="L-87"><a href="#L-87"><span class="linenos"> 87</span></a> <span class="c1"># Assume columns without a qualified table are references to output columns</span> +</span><span id="L-88"><a href="#L-88"><span class="linenos"> 88</span></a> <span class="n">order_refs</span> <span class="o">=</span> <span class="p">{</span><span class="n">c</span><span class="o">.</span><span class="n">name</span> <span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="n">order</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">)</span> <span class="k">if</span> <span class="ow">not</span> <span class="n">c</span><span class="o">.</span><span class="n">table</span><span class="p">}</span> +</span><span id="L-89"><a href="#L-89"><span class="linenos"> 89</span></a> <span class="k">else</span><span class="p">:</span> +</span><span id="L-90"><a href="#L-90"><span class="linenos"> 90</span></a> <span class="n">order_refs</span> <span class="o">=</span> <span class="nb">set</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="n">new_selections</span> <span class="o">=</span> <span class="p">[]</span> +</span><span id="L-93"><a href="#L-93"><span class="linenos"> 93</span></a> <span class="n">removed</span> <span class="o">=</span> <span class="kc">False</span> +</span><span id="L-94"><a href="#L-94"><span class="linenos"> 94</span></a> <span class="n">star</span> <span class="o">=</span> <span class="kc">False</span> </span><span id="L-95"><a href="#L-95"><span class="linenos"> 95</span></a> -</span><span id="L-96"><a href="#L-96"><span class="linenos"> 96</span></a> <span class="k">if</span> <span class="n">SELECT_ALL</span> <span class="ow">in</span> <span class="n">parent_selections</span> <span class="ow">or</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">parent_selections</span> <span class="ow">or</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">order_refs</span><span class="p">:</span> -</span><span id="L-97"><a href="#L-97"><span class="linenos"> 97</span></a> <span class="n">new_selections</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">selection</span><span class="p">)</span> -</span><span id="L-98"><a href="#L-98"><span class="linenos"> 98</span></a> <span class="k">else</span><span class="p">:</span> -</span><span id="L-99"><a href="#L-99"><span class="linenos"> 99</span></a> <span class="k">if</span> <span class="n">selection</span><span class="o">.</span><span class="n">is_star</span><span class="p">:</span> -</span><span id="L-100"><a href="#L-100"><span class="linenos">100</span></a> <span class="n">star</span> <span class="o">=</span> <span class="kc">True</span> -</span><span id="L-101"><a href="#L-101"><span class="linenos">101</span></a> <span class="n">removed</span> <span class="o">=</span> <span class="kc">True</span> -</span><span id="L-102"><a href="#L-102"><span class="linenos">102</span></a> -</span><span id="L-103"><a href="#L-103"><span class="linenos">103</span></a> <span class="k">if</span> <span class="n">star</span><span class="p">:</span> -</span><span id="L-104"><a href="#L-104"><span class="linenos">104</span></a> <span class="n">resolver</span> <span class="o">=</span> <span class="n">Resolver</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">schema</span><span class="p">)</span> -</span><span id="L-105"><a href="#L-105"><span class="linenos">105</span></a> <span class="n">names</span> <span class="o">=</span> <span class="p">{</span><span class="n">s</span><span class="o">.</span><span class="n">alias_or_name</span> <span class="k">for</span> <span class="n">s</span> <span class="ow">in</span> <span class="n">new_selections</span><span class="p">}</span> -</span><span id="L-106"><a href="#L-106"><span class="linenos">106</span></a> -</span><span id="L-107"><a href="#L-107"><span class="linenos">107</span></a> <span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="nb">sorted</span><span class="p">(</span><span class="n">parent_selections</span><span class="p">):</span> -</span><span id="L-108"><a href="#L-108"><span class="linenos">108</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">names</span><span class="p">:</span> -</span><span id="L-109"><a href="#L-109"><span class="linenos">109</span></a> <span class="n">new_selections</span><span class="o">.</span><span class="n">append</span><span class="p">(</span> -</span><span id="L-110"><a href="#L-110"><span class="linenos">110</span></a> <span class="n">alias</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">column</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="n">table</span><span class="o">=</span><span class="n">resolver</span><span class="o">.</span><span class="n">get_table</span><span class="p">(</span><span class="n">name</span><span class="p">)),</span> <span class="n">name</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-111"><a href="#L-111"><span class="linenos">111</span></a> <span class="p">)</span> -</span><span id="L-112"><a href="#L-112"><span class="linenos">112</span></a> -</span><span id="L-113"><a href="#L-113"><span class="linenos">113</span></a> <span class="c1"># If there are no remaining selections, just select a single constant</span> -</span><span id="L-114"><a href="#L-114"><span class="linenos">114</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">new_selections</span><span class="p">:</span> -</span><span id="L-115"><a href="#L-115"><span class="linenos">115</span></a> <span class="n">new_selections</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">DEFAULT_SELECTION</span><span class="p">())</span> -</span><span id="L-116"><a href="#L-116"><span class="linenos">116</span></a> -</span><span id="L-117"><a href="#L-117"><span class="linenos">117</span></a> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="o">*</span><span class="n">new_selections</span><span class="p">,</span> <span class="n">append</span><span class="o">=</span><span class="kc">False</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-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">removed</span><span class="p">:</span> -</span><span id="L-120"><a href="#L-120"><span class="linenos">120</span></a> <span class="n">scope</span><span class="o">.</span><span class="n">clear_cache</span><span class="p">()</span> +</span><span id="L-96"><a href="#L-96"><span class="linenos"> 96</span></a> <span class="k">for</span> <span class="n">selection</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">selects</span><span class="p">:</span> +</span><span id="L-97"><a href="#L-97"><span class="linenos"> 97</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">selection</span><span class="o">.</span><span class="n">alias_or_name</span> +</span><span id="L-98"><a href="#L-98"><span class="linenos"> 98</span></a> +</span><span id="L-99"><a href="#L-99"><span class="linenos"> 99</span></a> <span class="k">if</span> <span class="n">SELECT_ALL</span> <span class="ow">in</span> <span class="n">parent_selections</span> <span class="ow">or</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">parent_selections</span> <span class="ow">or</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">order_refs</span><span class="p">:</span> +</span><span id="L-100"><a href="#L-100"><span class="linenos">100</span></a> <span class="n">new_selections</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">selection</span><span class="p">)</span> +</span><span id="L-101"><a href="#L-101"><span class="linenos">101</span></a> <span class="k">else</span><span class="p">:</span> +</span><span id="L-102"><a href="#L-102"><span class="linenos">102</span></a> <span class="k">if</span> <span class="n">selection</span><span class="o">.</span><span class="n">is_star</span><span class="p">:</span> +</span><span id="L-103"><a href="#L-103"><span class="linenos">103</span></a> <span class="n">star</span> <span class="o">=</span> <span class="kc">True</span> +</span><span id="L-104"><a href="#L-104"><span class="linenos">104</span></a> <span class="n">removed</span> <span class="o">=</span> <span class="kc">True</span> +</span><span id="L-105"><a href="#L-105"><span class="linenos">105</span></a> +</span><span id="L-106"><a href="#L-106"><span class="linenos">106</span></a> <span class="k">if</span> <span class="n">star</span><span class="p">:</span> +</span><span id="L-107"><a href="#L-107"><span class="linenos">107</span></a> <span class="n">resolver</span> <span class="o">=</span> <span class="n">Resolver</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">schema</span><span class="p">)</span> +</span><span id="L-108"><a href="#L-108"><span class="linenos">108</span></a> <span class="n">names</span> <span class="o">=</span> <span class="p">{</span><span class="n">s</span><span class="o">.</span><span class="n">alias_or_name</span> <span class="k">for</span> <span class="n">s</span> <span class="ow">in</span> <span class="n">new_selections</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="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="nb">sorted</span><span class="p">(</span><span class="n">parent_selections</span><span class="p">):</span> +</span><span id="L-111"><a href="#L-111"><span class="linenos">111</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">names</span><span class="p">:</span> +</span><span id="L-112"><a href="#L-112"><span class="linenos">112</span></a> <span class="n">new_selections</span><span class="o">.</span><span class="n">append</span><span class="p">(</span> +</span><span id="L-113"><a href="#L-113"><span class="linenos">113</span></a> <span class="n">alias</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">column</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="n">table</span><span class="o">=</span><span class="n">resolver</span><span class="o">.</span><span class="n">get_table</span><span class="p">(</span><span class="n">name</span><span class="p">)),</span> <span class="n">name</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-114"><a href="#L-114"><span class="linenos">114</span></a> <span class="p">)</span> +</span><span id="L-115"><a href="#L-115"><span class="linenos">115</span></a> +</span><span id="L-116"><a href="#L-116"><span class="linenos">116</span></a> <span class="c1"># If there are no remaining selections, just select a single constant</span> +</span><span id="L-117"><a href="#L-117"><span class="linenos">117</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">new_selections</span><span class="p">:</span> +</span><span id="L-118"><a href="#L-118"><span class="linenos">118</span></a> <span class="n">new_selections</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">DEFAULT_SELECTION</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="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="o">*</span><span class="n">new_selections</span><span class="p">,</span> <span class="n">append</span><span class="o">=</span><span class="kc">False</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-121"><a href="#L-121"><span class="linenos">121</span></a> +</span><span id="L-122"><a href="#L-122"><span class="linenos">122</span></a> <span class="k">if</span> <span class="n">removed</span><span class="p">:</span> +</span><span id="L-123"><a href="#L-123"><span class="linenos">123</span></a> <span class="n">scope</span><span class="o">.</span><span class="n">clear_cache</span><span class="p">()</span> </span></pre></div> @@ -276,20 +279,23 @@ </span><span id="pushdown_projections-62"><a href="#pushdown_projections-62"><span class="linenos">62</span></a> <span class="k">if</span> <span class="n">remove_unused_selections</span><span class="p">:</span> </span><span id="pushdown_projections-63"><a href="#pushdown_projections-63"><span class="linenos">63</span></a> <span class="n">_remove_unused_selections</span><span class="p">(</span><span class="n">scope</span><span class="p">,</span> <span class="n">parent_selections</span><span class="p">,</span> <span class="n">schema</span><span class="p">)</span> </span><span id="pushdown_projections-64"><a href="#pushdown_projections-64"><span class="linenos">64</span></a> -</span><span id="pushdown_projections-65"><a href="#pushdown_projections-65"><span class="linenos">65</span></a> <span class="c1"># Group columns by source name</span> -</span><span id="pushdown_projections-66"><a href="#pushdown_projections-66"><span class="linenos">66</span></a> <span class="n">selects</span> <span class="o">=</span> <span class="n">defaultdict</span><span class="p">(</span><span class="nb">set</span><span class="p">)</span> -</span><span id="pushdown_projections-67"><a href="#pushdown_projections-67"><span class="linenos">67</span></a> <span class="k">for</span> <span class="n">col</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">columns</span><span class="p">:</span> -</span><span id="pushdown_projections-68"><a href="#pushdown_projections-68"><span class="linenos">68</span></a> <span class="n">table_name</span> <span class="o">=</span> <span class="n">col</span><span class="o">.</span><span class="n">table</span> -</span><span id="pushdown_projections-69"><a href="#pushdown_projections-69"><span class="linenos">69</span></a> <span class="n">col_name</span> <span class="o">=</span> <span class="n">col</span><span class="o">.</span><span class="n">name</span> -</span><span id="pushdown_projections-70"><a href="#pushdown_projections-70"><span class="linenos">70</span></a> <span class="n">selects</span><span class="p">[</span><span class="n">table_name</span><span class="p">]</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">col_name</span><span class="p">)</span> -</span><span id="pushdown_projections-71"><a href="#pushdown_projections-71"><span class="linenos">71</span></a> -</span><span id="pushdown_projections-72"><a href="#pushdown_projections-72"><span class="linenos">72</span></a> <span class="c1"># Push the selected columns down to the next scope</span> -</span><span id="pushdown_projections-73"><a href="#pushdown_projections-73"><span class="linenos">73</span></a> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="p">(</span><span class="n">_</span><span class="p">,</span> <span class="n">source</span><span class="p">)</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="o">.</span><span class="n">items</span><span class="p">():</span> -</span><span id="pushdown_projections-74"><a href="#pushdown_projections-74"><span class="linenos">74</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">Scope</span><span class="p">):</span> -</span><span id="pushdown_projections-75"><a href="#pushdown_projections-75"><span class="linenos">75</span></a> <span class="n">columns</span> <span class="o">=</span> <span class="n">selects</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">name</span><span class="p">)</span> <span class="ow">or</span> <span class="nb">set</span><span class="p">()</span> -</span><span id="pushdown_projections-76"><a href="#pushdown_projections-76"><span class="linenos">76</span></a> <span class="n">referenced_columns</span><span class="p">[</span><span class="n">source</span><span class="p">]</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">columns</span><span class="p">)</span> -</span><span id="pushdown_projections-77"><a href="#pushdown_projections-77"><span class="linenos">77</span></a> -</span><span id="pushdown_projections-78"><a href="#pushdown_projections-78"><span class="linenos">78</span></a> <span class="k">return</span> <span class="n">expression</span> +</span><span id="pushdown_projections-65"><a href="#pushdown_projections-65"><span class="linenos">65</span></a> <span class="k">if</span> <span class="n">scope</span><span class="o">.</span><span class="n">expression</span><span class="o">.</span><span class="n">is_star</span><span class="p">:</span> +</span><span id="pushdown_projections-66"><a href="#pushdown_projections-66"><span class="linenos">66</span></a> <span class="k">continue</span> +</span><span id="pushdown_projections-67"><a href="#pushdown_projections-67"><span class="linenos">67</span></a> +</span><span id="pushdown_projections-68"><a href="#pushdown_projections-68"><span class="linenos">68</span></a> <span class="c1"># Group columns by source name</span> +</span><span id="pushdown_projections-69"><a href="#pushdown_projections-69"><span class="linenos">69</span></a> <span class="n">selects</span> <span class="o">=</span> <span class="n">defaultdict</span><span class="p">(</span><span class="nb">set</span><span class="p">)</span> +</span><span id="pushdown_projections-70"><a href="#pushdown_projections-70"><span class="linenos">70</span></a> <span class="k">for</span> <span class="n">col</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">columns</span><span class="p">:</span> +</span><span id="pushdown_projections-71"><a href="#pushdown_projections-71"><span class="linenos">71</span></a> <span class="n">table_name</span> <span class="o">=</span> <span class="n">col</span><span class="o">.</span><span class="n">table</span> +</span><span id="pushdown_projections-72"><a href="#pushdown_projections-72"><span class="linenos">72</span></a> <span class="n">col_name</span> <span class="o">=</span> <span class="n">col</span><span class="o">.</span><span class="n">name</span> +</span><span id="pushdown_projections-73"><a href="#pushdown_projections-73"><span class="linenos">73</span></a> <span class="n">selects</span><span class="p">[</span><span class="n">table_name</span><span class="p">]</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">col_name</span><span class="p">)</span> +</span><span id="pushdown_projections-74"><a href="#pushdown_projections-74"><span class="linenos">74</span></a> +</span><span id="pushdown_projections-75"><a href="#pushdown_projections-75"><span class="linenos">75</span></a> <span class="c1"># Push the selected columns down to the next scope</span> +</span><span id="pushdown_projections-76"><a href="#pushdown_projections-76"><span class="linenos">76</span></a> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="p">(</span><span class="n">_</span><span class="p">,</span> <span class="n">source</span><span class="p">)</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">selected_sources</span><span class="o">.</span><span class="n">items</span><span class="p">():</span> +</span><span id="pushdown_projections-77"><a href="#pushdown_projections-77"><span class="linenos">77</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">Scope</span><span class="p">):</span> +</span><span id="pushdown_projections-78"><a href="#pushdown_projections-78"><span class="linenos">78</span></a> <span class="n">columns</span> <span class="o">=</span> <span class="n">selects</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">name</span><span class="p">)</span> <span class="ow">or</span> <span class="nb">set</span><span class="p">()</span> +</span><span id="pushdown_projections-79"><a href="#pushdown_projections-79"><span class="linenos">79</span></a> <span class="n">referenced_columns</span><span class="p">[</span><span class="n">source</span><span class="p">]</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">columns</span><span class="p">)</span> +</span><span id="pushdown_projections-80"><a href="#pushdown_projections-80"><span class="linenos">80</span></a> +</span><span id="pushdown_projections-81"><a href="#pushdown_projections-81"><span class="linenos">81</span></a> <span class="k">return</span> <span class="n">expression</span> </span></pre></div> |