diff options
Diffstat (limited to 'docs/sqlglot/optimizer/optimize_joins.html')
| -rw-r--r-- | docs/sqlglot/optimizer/optimize_joins.html | 176 |
1 files changed, 92 insertions, 84 deletions
diff --git a/docs/sqlglot/optimizer/optimize_joins.html b/docs/sqlglot/optimizer/optimize_joins.html index 263d589..53d0478 100644 --- a/docs/sqlglot/optimizer/optimize_joins.html +++ b/docs/sqlglot/optimizer/optimize_joins.html @@ -109,52 +109,56 @@ </span><span id="L-39"><a href="#L-39"><span class="linenos">39</span></a> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">other_table_names</span><span class="p">(</span><span class="n">dep</span><span class="p">))</span> <span class="o"><</span> <span class="mi">2</span><span class="p">:</span> </span><span id="L-40"><a href="#L-40"><span class="linenos">40</span></a> <span class="k">continue</span> </span><span id="L-41"><a href="#L-41"><span class="linenos">41</span></a> -</span><span id="L-42"><a href="#L-42"><span class="linenos">42</span></a> <span class="k">for</span> <span class="n">predicate</span> <span class="ow">in</span> <span class="n">on</span><span class="o">.</span><span class="n">flatten</span><span class="p">():</span> -</span><span id="L-43"><a href="#L-43"><span class="linenos">43</span></a> <span class="k">if</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">predicate</span><span class="p">):</span> -</span><span id="L-44"><a href="#L-44"><span class="linenos">44</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-45"><a href="#L-45"><span class="linenos">45</span></a> <span class="n">join</span><span class="o">.</span><span class="n">on</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span> -</span><span id="L-46"><a href="#L-46"><span class="linenos">46</span></a> -</span><span id="L-47"><a href="#L-47"><span class="linenos">47</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">reorder_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> -</span><span id="L-48"><a href="#L-48"><span class="linenos">48</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">normalize</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> -</span><span id="L-49"><a href="#L-49"><span class="linenos">49</span></a> <span class="k">return</span> <span class="n">expression</span> +</span><span id="L-42"><a href="#L-42"><span class="linenos">42</span></a> <span class="n">operator</span> <span class="o">=</span> <span class="nb">type</span><span class="p">(</span><span class="n">on</span><span class="p">)</span> +</span><span id="L-43"><a href="#L-43"><span class="linenos">43</span></a> <span class="k">for</span> <span class="n">predicate</span> <span class="ow">in</span> <span class="n">on</span><span class="o">.</span><span class="n">flatten</span><span class="p">():</span> +</span><span id="L-44"><a href="#L-44"><span class="linenos">44</span></a> <span class="k">if</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">predicate</span><span class="p">):</span> +</span><span id="L-45"><a href="#L-45"><span class="linenos">45</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-46"><a href="#L-46"><span class="linenos">46</span></a> <span class="n">predicate</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">_combine</span><span class="p">(</span> +</span><span id="L-47"><a href="#L-47"><span class="linenos">47</span></a> <span class="p">[</span><span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">),</span> <span class="n">predicate</span><span class="p">],</span> <span class="n">operator</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</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 class="n">join</span><span class="o">.</span><span class="n">on</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">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-50"><a href="#L-50"><span class="linenos">50</span></a> -</span><span id="L-51"><a href="#L-51"><span class="linenos">51</span></a> -</span><span id="L-52"><a href="#L-52"><span class="linenos">52</span></a><span class="k">def</span> <span class="nf">reorder_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span> -</span><span id="L-53"><a href="#L-53"><span class="linenos">53</span></a><span class="w"> </span><span class="sd">"""</span> -</span><span id="L-54"><a href="#L-54"><span class="linenos">54</span></a><span class="sd"> Reorder joins by topological sort order based on predicate references.</span> -</span><span id="L-55"><a href="#L-55"><span class="linenos">55</span></a><span class="sd"> """</span> -</span><span id="L-56"><a href="#L-56"><span class="linenos">56</span></a> <span class="k">for</span> <span class="n">from_</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">):</span> -</span><span id="L-57"><a href="#L-57"><span class="linenos">57</span></a> <span class="n">parent</span> <span class="o">=</span> <span class="n">from_</span><span class="o">.</span><span class="n">parent</span> -</span><span id="L-58"><a href="#L-58"><span class="linenos">58</span></a> <span class="n">joins</span> <span class="o">=</span> <span class="p">{</span><span class="n">join</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span> <span class="n">join</span> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">parent</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="p">[])}</span> -</span><span id="L-59"><a href="#L-59"><span class="linenos">59</span></a> <span class="n">dag</span> <span class="o">=</span> <span class="p">{</span><span class="n">name</span><span class="p">:</span> <span class="n">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">)</span> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">joins</span><span class="o">.</span><span class="n">items</span><span class="p">()}</span> -</span><span id="L-60"><a href="#L-60"><span class="linenos">60</span></a> <span class="n">parent</span><span class="o">.</span><span class="n">set</span><span class="p">(</span> -</span><span id="L-61"><a href="#L-61"><span class="linenos">61</span></a> <span class="s2">"joins"</span><span class="p">,</span> -</span><span id="L-62"><a href="#L-62"><span class="linenos">62</span></a> <span class="p">[</span><span class="n">joins</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">tsort</span><span class="p">(</span><span class="n">dag</span><span class="p">)</span> <span class="k">if</span> <span class="n">name</span> <span class="o">!=</span> <span class="n">from_</span><span class="o">.</span><span class="n">alias_or_name</span> <span class="ow">and</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">joins</span><span class="p">],</span> -</span><span id="L-63"><a href="#L-63"><span class="linenos">63</span></a> <span class="p">)</span> -</span><span id="L-64"><a href="#L-64"><span class="linenos">64</span></a> <span class="k">return</span> <span class="n">expression</span> -</span><span id="L-65"><a href="#L-65"><span class="linenos">65</span></a> -</span><span id="L-66"><a href="#L-66"><span class="linenos">66</span></a> -</span><span id="L-67"><a href="#L-67"><span class="linenos">67</span></a><span class="k">def</span> <span class="nf">normalize</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span> -</span><span id="L-68"><a href="#L-68"><span class="linenos">68</span></a><span class="w"> </span><span class="sd">"""</span> -</span><span id="L-69"><a href="#L-69"><span class="linenos">69</span></a><span class="sd"> Remove INNER and OUTER from joins as they are optional.</span> -</span><span id="L-70"><a href="#L-70"><span class="linenos">70</span></a><span class="sd"> """</span> -</span><span id="L-71"><a href="#L-71"><span class="linenos">71</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span> -</span><span id="L-72"><a href="#L-72"><span class="linenos">72</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="nb">any</span><span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">k</span><span class="p">)</span> <span class="k">for</span> <span class="n">k</span> <span class="ow">in</span> <span class="n">JOIN_ATTRS</span><span class="p">):</span> -</span><span id="L-73"><a href="#L-73"><span class="linenos">73</span></a> <span class="n">join</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"kind"</span><span class="p">,</span> <span class="s2">"CROSS"</span><span class="p">)</span> -</span><span id="L-74"><a href="#L-74"><span class="linenos">74</span></a> -</span><span id="L-75"><a href="#L-75"><span class="linenos">75</span></a> <span class="k">if</span> <span class="n">join</span><span class="o">.</span><span class="n">kind</span> <span class="o">==</span> <span class="s2">"CROSS"</span><span class="p">:</span> -</span><span id="L-76"><a href="#L-76"><span class="linenos">76</span></a> <span class="n">join</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"on"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> -</span><span id="L-77"><a href="#L-77"><span class="linenos">77</span></a> <span class="k">else</span><span class="p">:</span> -</span><span id="L-78"><a href="#L-78"><span class="linenos">78</span></a> <span class="n">join</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"kind"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> -</span><span id="L-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">if</span> <span class="ow">not</span> <span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"using"</span><span class="p">):</span> -</span><span id="L-81"><a href="#L-81"><span class="linenos">81</span></a> <span class="n">join</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"on"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span> -</span><span id="L-82"><a href="#L-82"><span class="linenos">82</span></a> <span class="k">return</span> <span class="n">expression</span> +</span><span id="L-51"><a href="#L-51"><span class="linenos">51</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">reorder_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> +</span><span id="L-52"><a href="#L-52"><span class="linenos">52</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">normalize</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> +</span><span id="L-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">reorder_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span> +</span><span id="L-57"><a href="#L-57"><span class="linenos">57</span></a><span class="w"> </span><span class="sd">"""</span> +</span><span id="L-58"><a href="#L-58"><span class="linenos">58</span></a><span class="sd"> Reorder joins by topological sort order based on predicate references.</span> +</span><span id="L-59"><a href="#L-59"><span class="linenos">59</span></a><span class="sd"> """</span> +</span><span id="L-60"><a href="#L-60"><span class="linenos">60</span></a> <span class="k">for</span> <span class="n">from_</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">):</span> +</span><span id="L-61"><a href="#L-61"><span class="linenos">61</span></a> <span class="n">parent</span> <span class="o">=</span> <span class="n">from_</span><span class="o">.</span><span class="n">parent</span> +</span><span id="L-62"><a href="#L-62"><span class="linenos">62</span></a> <span class="n">joins</span> <span class="o">=</span> <span class="p">{</span><span class="n">join</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span> <span class="n">join</span> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">parent</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="p">[])}</span> +</span><span id="L-63"><a href="#L-63"><span class="linenos">63</span></a> <span class="n">dag</span> <span class="o">=</span> <span class="p">{</span><span class="n">name</span><span class="p">:</span> <span class="n">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">)</span> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">joins</span><span class="o">.</span><span class="n">items</span><span class="p">()}</span> +</span><span id="L-64"><a href="#L-64"><span class="linenos">64</span></a> <span class="n">parent</span><span class="o">.</span><span class="n">set</span><span class="p">(</span> +</span><span id="L-65"><a href="#L-65"><span class="linenos">65</span></a> <span class="s2">"joins"</span><span class="p">,</span> +</span><span id="L-66"><a href="#L-66"><span class="linenos">66</span></a> <span class="p">[</span><span class="n">joins</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">tsort</span><span class="p">(</span><span class="n">dag</span><span class="p">)</span> <span class="k">if</span> <span class="n">name</span> <span class="o">!=</span> <span class="n">from_</span><span class="o">.</span><span class="n">alias_or_name</span> <span class="ow">and</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">joins</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 class="k">return</span> <span class="n">expression</span> +</span><span id="L-69"><a href="#L-69"><span class="linenos">69</span></a> +</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">def</span> <span class="nf">normalize</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span> +</span><span id="L-72"><a href="#L-72"><span class="linenos">72</span></a><span class="w"> </span><span class="sd">"""</span> +</span><span id="L-73"><a href="#L-73"><span class="linenos">73</span></a><span class="sd"> Remove INNER and OUTER from joins as they are optional.</span> +</span><span id="L-74"><a href="#L-74"><span class="linenos">74</span></a><span class="sd"> """</span> +</span><span id="L-75"><a href="#L-75"><span class="linenos">75</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span> +</span><span id="L-76"><a href="#L-76"><span class="linenos">76</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="nb">any</span><span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">k</span><span class="p">)</span> <span class="k">for</span> <span class="n">k</span> <span class="ow">in</span> <span class="n">JOIN_ATTRS</span><span class="p">):</span> +</span><span id="L-77"><a href="#L-77"><span class="linenos">77</span></a> <span class="n">join</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"kind"</span><span class="p">,</span> <span class="s2">"CROSS"</span><span class="p">)</span> +</span><span id="L-78"><a href="#L-78"><span class="linenos">78</span></a> +</span><span id="L-79"><a href="#L-79"><span class="linenos">79</span></a> <span class="k">if</span> <span class="n">join</span><span class="o">.</span><span class="n">kind</span> <span class="o">==</span> <span class="s2">"CROSS"</span><span class="p">:</span> +</span><span id="L-80"><a href="#L-80"><span class="linenos">80</span></a> <span class="n">join</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"on"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> +</span><span id="L-81"><a href="#L-81"><span class="linenos">81</span></a> <span class="k">else</span><span class="p">:</span> +</span><span id="L-82"><a href="#L-82"><span class="linenos">82</span></a> <span class="n">join</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"kind"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> </span><span id="L-83"><a href="#L-83"><span class="linenos">83</span></a> -</span><span id="L-84"><a href="#L-84"><span class="linenos">84</span></a> -</span><span id="L-85"><a href="#L-85"><span class="linenos">85</span></a><span class="k">def</span> <span class="nf">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">)</span> <span class="o">-></span> <span class="n">t</span><span class="o">.</span><span class="n">Set</span><span class="p">[</span><span class="nb">str</span><span class="p">]:</span> -</span><span id="L-86"><a href="#L-86"><span class="linenos">86</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)</span> -</span><span id="L-87"><a href="#L-87"><span class="linenos">87</span></a> <span class="k">return</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">join</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">)</span> <span class="k">if</span> <span class="n">on</span> <span class="k">else</span> <span class="nb">set</span><span class="p">()</span> +</span><span id="L-84"><a href="#L-84"><span class="linenos">84</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"using"</span><span class="p">):</span> +</span><span id="L-85"><a href="#L-85"><span class="linenos">85</span></a> <span class="n">join</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"on"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span> +</span><span id="L-86"><a href="#L-86"><span class="linenos">86</span></a> <span class="k">return</span> <span class="n">expression</span> +</span><span id="L-87"><a href="#L-87"><span class="linenos">87</span></a> +</span><span id="L-88"><a href="#L-88"><span class="linenos">88</span></a> +</span><span id="L-89"><a href="#L-89"><span class="linenos">89</span></a><span class="k">def</span> <span class="nf">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">)</span> <span class="o">-></span> <span class="n">t</span><span class="o">.</span><span class="n">Set</span><span class="p">[</span><span class="nb">str</span><span class="p">]:</span> +</span><span id="L-90"><a href="#L-90"><span class="linenos">90</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)</span> +</span><span id="L-91"><a href="#L-91"><span class="linenos">91</span></a> <span class="k">return</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">join</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">)</span> <span class="k">if</span> <span class="n">on</span> <span class="k">else</span> <span class="nb">set</span><span class="p">()</span> </span></pre></div> @@ -213,14 +217,18 @@ </span><span id="optimize_joins-40"><a href="#optimize_joins-40"><span class="linenos">40</span></a> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">other_table_names</span><span class="p">(</span><span class="n">dep</span><span class="p">))</span> <span class="o"><</span> <span class="mi">2</span><span class="p">:</span> </span><span id="optimize_joins-41"><a href="#optimize_joins-41"><span class="linenos">41</span></a> <span class="k">continue</span> </span><span id="optimize_joins-42"><a href="#optimize_joins-42"><span class="linenos">42</span></a> -</span><span id="optimize_joins-43"><a href="#optimize_joins-43"><span class="linenos">43</span></a> <span class="k">for</span> <span class="n">predicate</span> <span class="ow">in</span> <span class="n">on</span><span class="o">.</span><span class="n">flatten</span><span class="p">():</span> -</span><span id="optimize_joins-44"><a href="#optimize_joins-44"><span class="linenos">44</span></a> <span class="k">if</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">predicate</span><span class="p">):</span> -</span><span id="optimize_joins-45"><a href="#optimize_joins-45"><span class="linenos">45</span></a> <span class="n">predicate</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span> -</span><span id="optimize_joins-46"><a href="#optimize_joins-46"><span class="linenos">46</span></a> <span class="n">join</span><span class="o">.</span><span class="n">on</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span> -</span><span id="optimize_joins-47"><a href="#optimize_joins-47"><span class="linenos">47</span></a> -</span><span id="optimize_joins-48"><a href="#optimize_joins-48"><span class="linenos">48</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">reorder_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> -</span><span id="optimize_joins-49"><a href="#optimize_joins-49"><span class="linenos">49</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">normalize</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> -</span><span id="optimize_joins-50"><a href="#optimize_joins-50"><span class="linenos">50</span></a> <span class="k">return</span> <span class="n">expression</span> +</span><span id="optimize_joins-43"><a href="#optimize_joins-43"><span class="linenos">43</span></a> <span class="n">operator</span> <span class="o">=</span> <span class="nb">type</span><span class="p">(</span><span class="n">on</span><span class="p">)</span> +</span><span id="optimize_joins-44"><a href="#optimize_joins-44"><span class="linenos">44</span></a> <span class="k">for</span> <span class="n">predicate</span> <span class="ow">in</span> <span class="n">on</span><span class="o">.</span><span class="n">flatten</span><span class="p">():</span> +</span><span id="optimize_joins-45"><a href="#optimize_joins-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">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">predicate</span><span class="p">):</span> +</span><span id="optimize_joins-46"><a href="#optimize_joins-46"><span class="linenos">46</span></a> <span class="n">predicate</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span> +</span><span id="optimize_joins-47"><a href="#optimize_joins-47"><span class="linenos">47</span></a> <span class="n">predicate</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">_combine</span><span class="p">(</span> +</span><span id="optimize_joins-48"><a href="#optimize_joins-48"><span class="linenos">48</span></a> <span class="p">[</span><span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">),</span> <span class="n">predicate</span><span class="p">],</span> <span class="n">operator</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span> +</span><span id="optimize_joins-49"><a href="#optimize_joins-49"><span class="linenos">49</span></a> <span class="p">)</span> +</span><span id="optimize_joins-50"><a href="#optimize_joins-50"><span class="linenos">50</span></a> <span class="n">join</span><span class="o">.</span><span class="n">on</span><span class="p">(</span><span class="n">predicate</span><span class="p">,</span> <span class="n">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="optimize_joins-51"><a href="#optimize_joins-51"><span class="linenos">51</span></a> +</span><span id="optimize_joins-52"><a href="#optimize_joins-52"><span class="linenos">52</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">reorder_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> +</span><span id="optimize_joins-53"><a href="#optimize_joins-53"><span class="linenos">53</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">normalize</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> +</span><span id="optimize_joins-54"><a href="#optimize_joins-54"><span class="linenos">54</span></a> <span class="k">return</span> <span class="n">expression</span> </span></pre></div> @@ -251,19 +259,19 @@ </div> <a class="headerlink" href="#reorder_joins"></a> - <div class="pdoc-code codehilite"><pre><span></span><span id="reorder_joins-53"><a href="#reorder_joins-53"><span class="linenos">53</span></a><span class="k">def</span> <span class="nf">reorder_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span> -</span><span id="reorder_joins-54"><a href="#reorder_joins-54"><span class="linenos">54</span></a><span class="w"> </span><span class="sd">"""</span> -</span><span id="reorder_joins-55"><a href="#reorder_joins-55"><span class="linenos">55</span></a><span class="sd"> Reorder joins by topological sort order based on predicate references.</span> -</span><span id="reorder_joins-56"><a href="#reorder_joins-56"><span class="linenos">56</span></a><span class="sd"> """</span> -</span><span id="reorder_joins-57"><a href="#reorder_joins-57"><span class="linenos">57</span></a> <span class="k">for</span> <span class="n">from_</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">):</span> -</span><span id="reorder_joins-58"><a href="#reorder_joins-58"><span class="linenos">58</span></a> <span class="n">parent</span> <span class="o">=</span> <span class="n">from_</span><span class="o">.</span><span class="n">parent</span> -</span><span id="reorder_joins-59"><a href="#reorder_joins-59"><span class="linenos">59</span></a> <span class="n">joins</span> <span class="o">=</span> <span class="p">{</span><span class="n">join</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span> <span class="n">join</span> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">parent</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="p">[])}</span> -</span><span id="reorder_joins-60"><a href="#reorder_joins-60"><span class="linenos">60</span></a> <span class="n">dag</span> <span class="o">=</span> <span class="p">{</span><span class="n">name</span><span class="p">:</span> <span class="n">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">)</span> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">joins</span><span class="o">.</span><span class="n">items</span><span class="p">()}</span> -</span><span id="reorder_joins-61"><a href="#reorder_joins-61"><span class="linenos">61</span></a> <span class="n">parent</span><span class="o">.</span><span class="n">set</span><span class="p">(</span> -</span><span id="reorder_joins-62"><a href="#reorder_joins-62"><span class="linenos">62</span></a> <span class="s2">"joins"</span><span class="p">,</span> -</span><span id="reorder_joins-63"><a href="#reorder_joins-63"><span class="linenos">63</span></a> <span class="p">[</span><span class="n">joins</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">tsort</span><span class="p">(</span><span class="n">dag</span><span class="p">)</span> <span class="k">if</span> <span class="n">name</span> <span class="o">!=</span> <span class="n">from_</span><span class="o">.</span><span class="n">alias_or_name</span> <span class="ow">and</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">joins</span><span class="p">],</span> -</span><span id="reorder_joins-64"><a href="#reorder_joins-64"><span class="linenos">64</span></a> <span class="p">)</span> -</span><span id="reorder_joins-65"><a href="#reorder_joins-65"><span class="linenos">65</span></a> <span class="k">return</span> <span class="n">expression</span> + <div class="pdoc-code codehilite"><pre><span></span><span id="reorder_joins-57"><a href="#reorder_joins-57"><span class="linenos">57</span></a><span class="k">def</span> <span class="nf">reorder_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span> +</span><span id="reorder_joins-58"><a href="#reorder_joins-58"><span class="linenos">58</span></a><span class="w"> </span><span class="sd">"""</span> +</span><span id="reorder_joins-59"><a href="#reorder_joins-59"><span class="linenos">59</span></a><span class="sd"> Reorder joins by topological sort order based on predicate references.</span> +</span><span id="reorder_joins-60"><a href="#reorder_joins-60"><span class="linenos">60</span></a><span class="sd"> """</span> +</span><span id="reorder_joins-61"><a href="#reorder_joins-61"><span class="linenos">61</span></a> <span class="k">for</span> <span class="n">from_</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">From</span><span class="p">):</span> +</span><span id="reorder_joins-62"><a href="#reorder_joins-62"><span class="linenos">62</span></a> <span class="n">parent</span> <span class="o">=</span> <span class="n">from_</span><span class="o">.</span><span class="n">parent</span> +</span><span id="reorder_joins-63"><a href="#reorder_joins-63"><span class="linenos">63</span></a> <span class="n">joins</span> <span class="o">=</span> <span class="p">{</span><span class="n">join</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span> <span class="n">join</span> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">parent</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="p">[])}</span> +</span><span id="reorder_joins-64"><a href="#reorder_joins-64"><span class="linenos">64</span></a> <span class="n">dag</span> <span class="o">=</span> <span class="p">{</span><span class="n">name</span><span class="p">:</span> <span class="n">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">)</span> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">joins</span><span class="o">.</span><span class="n">items</span><span class="p">()}</span> +</span><span id="reorder_joins-65"><a href="#reorder_joins-65"><span class="linenos">65</span></a> <span class="n">parent</span><span class="o">.</span><span class="n">set</span><span class="p">(</span> +</span><span id="reorder_joins-66"><a href="#reorder_joins-66"><span class="linenos">66</span></a> <span class="s2">"joins"</span><span class="p">,</span> +</span><span id="reorder_joins-67"><a href="#reorder_joins-67"><span class="linenos">67</span></a> <span class="p">[</span><span class="n">joins</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">tsort</span><span class="p">(</span><span class="n">dag</span><span class="p">)</span> <span class="k">if</span> <span class="n">name</span> <span class="o">!=</span> <span class="n">from_</span><span class="o">.</span><span class="n">alias_or_name</span> <span class="ow">and</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">joins</span><span class="p">],</span> +</span><span id="reorder_joins-68"><a href="#reorder_joins-68"><span class="linenos">68</span></a> <span class="p">)</span> +</span><span id="reorder_joins-69"><a href="#reorder_joins-69"><span class="linenos">69</span></a> <span class="k">return</span> <span class="n">expression</span> </span></pre></div> @@ -283,22 +291,22 @@ </div> <a class="headerlink" href="#normalize"></a> - <div class="pdoc-code codehilite"><pre><span></span><span id="normalize-68"><a href="#normalize-68"><span class="linenos">68</span></a><span class="k">def</span> <span class="nf">normalize</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span> -</span><span id="normalize-69"><a href="#normalize-69"><span class="linenos">69</span></a><span class="w"> </span><span class="sd">"""</span> -</span><span id="normalize-70"><a href="#normalize-70"><span class="linenos">70</span></a><span class="sd"> Remove INNER and OUTER from joins as they are optional.</span> -</span><span id="normalize-71"><a href="#normalize-71"><span class="linenos">71</span></a><span class="sd"> """</span> -</span><span id="normalize-72"><a href="#normalize-72"><span class="linenos">72</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span> -</span><span id="normalize-73"><a href="#normalize-73"><span class="linenos">73</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="nb">any</span><span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">k</span><span class="p">)</span> <span class="k">for</span> <span class="n">k</span> <span class="ow">in</span> <span class="n">JOIN_ATTRS</span><span class="p">):</span> -</span><span id="normalize-74"><a href="#normalize-74"><span class="linenos">74</span></a> <span class="n">join</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"kind"</span><span class="p">,</span> <span class="s2">"CROSS"</span><span class="p">)</span> -</span><span id="normalize-75"><a href="#normalize-75"><span class="linenos">75</span></a> -</span><span id="normalize-76"><a href="#normalize-76"><span class="linenos">76</span></a> <span class="k">if</span> <span class="n">join</span><span class="o">.</span><span class="n">kind</span> <span class="o">==</span> <span class="s2">"CROSS"</span><span class="p">:</span> -</span><span id="normalize-77"><a href="#normalize-77"><span class="linenos">77</span></a> <span class="n">join</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"on"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> -</span><span id="normalize-78"><a href="#normalize-78"><span class="linenos">78</span></a> <span class="k">else</span><span class="p">:</span> -</span><span id="normalize-79"><a href="#normalize-79"><span class="linenos">79</span></a> <span class="n">join</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"kind"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> -</span><span id="normalize-80"><a href="#normalize-80"><span class="linenos">80</span></a> -</span><span id="normalize-81"><a href="#normalize-81"><span class="linenos">81</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"using"</span><span class="p">):</span> -</span><span id="normalize-82"><a href="#normalize-82"><span class="linenos">82</span></a> <span class="n">join</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"on"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span> -</span><span id="normalize-83"><a href="#normalize-83"><span class="linenos">83</span></a> <span class="k">return</span> <span class="n">expression</span> + <div class="pdoc-code codehilite"><pre><span></span><span id="normalize-72"><a href="#normalize-72"><span class="linenos">72</span></a><span class="k">def</span> <span class="nf">normalize</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span> +</span><span id="normalize-73"><a href="#normalize-73"><span class="linenos">73</span></a><span class="w"> </span><span class="sd">"""</span> +</span><span id="normalize-74"><a href="#normalize-74"><span class="linenos">74</span></a><span class="sd"> Remove INNER and OUTER from joins as they are optional.</span> +</span><span id="normalize-75"><a href="#normalize-75"><span class="linenos">75</span></a><span class="sd"> """</span> +</span><span id="normalize-76"><a href="#normalize-76"><span class="linenos">76</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">):</span> +</span><span id="normalize-77"><a href="#normalize-77"><span class="linenos">77</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="nb">any</span><span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">k</span><span class="p">)</span> <span class="k">for</span> <span class="n">k</span> <span class="ow">in</span> <span class="n">JOIN_ATTRS</span><span class="p">):</span> +</span><span id="normalize-78"><a href="#normalize-78"><span class="linenos">78</span></a> <span class="n">join</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"kind"</span><span class="p">,</span> <span class="s2">"CROSS"</span><span class="p">)</span> +</span><span id="normalize-79"><a href="#normalize-79"><span class="linenos">79</span></a> +</span><span id="normalize-80"><a href="#normalize-80"><span class="linenos">80</span></a> <span class="k">if</span> <span class="n">join</span><span class="o">.</span><span class="n">kind</span> <span class="o">==</span> <span class="s2">"CROSS"</span><span class="p">:</span> +</span><span id="normalize-81"><a href="#normalize-81"><span class="linenos">81</span></a> <span class="n">join</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"on"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> +</span><span id="normalize-82"><a href="#normalize-82"><span class="linenos">82</span></a> <span class="k">else</span><span class="p">:</span> +</span><span id="normalize-83"><a href="#normalize-83"><span class="linenos">83</span></a> <span class="n">join</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"kind"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> +</span><span id="normalize-84"><a href="#normalize-84"><span class="linenos">84</span></a> +</span><span id="normalize-85"><a href="#normalize-85"><span class="linenos">85</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"using"</span><span class="p">):</span> +</span><span id="normalize-86"><a href="#normalize-86"><span class="linenos">86</span></a> <span class="n">join</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"on"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">())</span> +</span><span id="normalize-87"><a href="#normalize-87"><span class="linenos">87</span></a> <span class="k">return</span> <span class="n">expression</span> </span></pre></div> @@ -318,9 +326,9 @@ </div> <a class="headerlink" href="#other_table_names"></a> - <div class="pdoc-code codehilite"><pre><span></span><span id="other_table_names-86"><a href="#other_table_names-86"><span class="linenos">86</span></a><span class="k">def</span> <span class="nf">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">)</span> <span class="o">-></span> <span class="n">t</span><span class="o">.</span><span class="n">Set</span><span class="p">[</span><span class="nb">str</span><span class="p">]:</span> -</span><span id="other_table_names-87"><a href="#other_table_names-87"><span class="linenos">87</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)</span> -</span><span id="other_table_names-88"><a href="#other_table_names-88"><span class="linenos">88</span></a> <span class="k">return</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">join</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">)</span> <span class="k">if</span> <span class="n">on</span> <span class="k">else</span> <span class="nb">set</span><span class="p">()</span> + <div class="pdoc-code codehilite"><pre><span></span><span id="other_table_names-90"><a href="#other_table_names-90"><span class="linenos">90</span></a><span class="k">def</span> <span class="nf">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Join</span><span class="p">)</span> <span class="o">-></span> <span class="n">t</span><span class="o">.</span><span class="n">Set</span><span class="p">[</span><span class="nb">str</span><span class="p">]:</span> +</span><span id="other_table_names-91"><a href="#other_table_names-91"><span class="linenos">91</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"on"</span><span class="p">)</span> +</span><span id="other_table_names-92"><a href="#other_table_names-92"><span class="linenos">92</span></a> <span class="k">return</span> <span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">join</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">)</span> <span class="k">if</span> <span class="n">on</span> <span class="k">else</span> <span class="nb">set</span><span class="p">()</span> </span></pre></div> |