diff options
Diffstat (limited to 'docs/sqlglot/optimizer/optimize_joins.html')
| -rw-r--r-- | docs/sqlglot/optimizer/optimize_joins.html | 292 |
1 files changed, 150 insertions, 142 deletions
diff --git a/docs/sqlglot/optimizer/optimize_joins.html b/docs/sqlglot/optimizer/optimize_joins.html index 7e0cab7..09be940 100644 --- a/docs/sqlglot/optimizer/optimize_joins.html +++ b/docs/sqlglot/optimizer/optimize_joins.html @@ -68,81 +68,86 @@ <div class="pdoc-code codehilite"><pre><span></span><span id="L-1"><a href="#L-1"><span class="linenos"> 1</span></a><span class="kn">from</span> <span class="nn">sqlglot</span> <span class="kn">import</span> <span class="n">exp</span> </span><span id="L-2"><a href="#L-2"><span class="linenos"> 2</span></a><span class="kn">from</span> <span class="nn">sqlglot.helper</span> <span class="kn">import</span> <span class="n">tsort</span> </span><span id="L-3"><a href="#L-3"><span class="linenos"> 3</span></a> -</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="k">def</span> <span class="nf">optimize_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span> -</span><span id="L-6"><a href="#L-6"><span class="linenos"> 6</span></a><span class="w"> </span><span class="sd">"""</span> -</span><span id="L-7"><a href="#L-7"><span class="linenos"> 7</span></a><span class="sd"> Removes cross joins if possible and reorder joins based on predicate dependencies.</span> -</span><span id="L-8"><a href="#L-8"><span class="linenos"> 8</span></a> -</span><span id="L-9"><a href="#L-9"><span class="linenos"> 9</span></a><span class="sd"> Example:</span> -</span><span id="L-10"><a href="#L-10"><span class="linenos">10</span></a><span class="sd"> >>> from sqlglot import parse_one</span> -</span><span id="L-11"><a href="#L-11"><span class="linenos">11</span></a><span class="sd"> >>> optimize_joins(parse_one("SELECT * FROM x CROSS JOIN y JOIN z ON x.a = z.a AND y.a = z.a")).sql()</span> -</span><span id="L-12"><a href="#L-12"><span class="linenos">12</span></a><span class="sd"> 'SELECT * FROM x JOIN z ON x.a = z.a AND TRUE JOIN y ON y.a = z.a'</span> -</span><span id="L-13"><a href="#L-13"><span class="linenos">13</span></a><span class="sd"> """</span> -</span><span id="L-14"><a href="#L-14"><span class="linenos">14</span></a> <span class="k">for</span> <span class="n">select</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</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-15"><a href="#L-15"><span class="linenos">15</span></a> <span class="n">references</span> <span class="o">=</span> <span class="p">{}</span> -</span><span id="L-16"><a href="#L-16"><span class="linenos">16</span></a> <span class="n">cross_joins</span> <span class="o">=</span> <span class="p">[]</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">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">select</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-19"><a href="#L-19"><span class="linenos">19</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">alias_or_name</span> -</span><span id="L-20"><a href="#L-20"><span class="linenos">20</span></a> <span class="n">tables</span> <span class="o">=</span> <span class="n">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span> -</span><span id="L-21"><a href="#L-21"><span class="linenos">21</span></a> -</span><span id="L-22"><a href="#L-22"><span class="linenos">22</span></a> <span class="k">if</span> <span class="n">tables</span><span class="p">:</span> -</span><span id="L-23"><a href="#L-23"><span class="linenos">23</span></a> <span class="k">for</span> <span class="n">table</span> <span class="ow">in</span> <span class="n">tables</span><span class="p">:</span> -</span><span id="L-24"><a href="#L-24"><span class="linenos">24</span></a> <span class="n">references</span><span class="p">[</span><span class="n">table</span><span class="p">]</span> <span class="o">=</span> <span class="n">references</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="p">[])</span> <span class="o">+</span> <span class="p">[</span><span class="n">join</span><span class="p">]</span> -</span><span id="L-25"><a href="#L-25"><span class="linenos">25</span></a> <span class="k">else</span><span class="p">:</span> -</span><span id="L-26"><a href="#L-26"><span class="linenos">26</span></a> <span class="n">cross_joins</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">name</span><span class="p">,</span> <span class="n">join</span><span class="p">))</span> -</span><span id="L-27"><a href="#L-27"><span class="linenos">27</span></a> -</span><span id="L-28"><a href="#L-28"><span class="linenos">28</span></a> <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">cross_joins</span><span class="p">:</span> -</span><span id="L-29"><a href="#L-29"><span class="linenos">29</span></a> <span class="k">for</span> <span class="n">dep</span> <span class="ow">in</span> <span class="n">references</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="p">[]):</span> -</span><span id="L-30"><a href="#L-30"><span class="linenos">30</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">dep</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"on"</span><span class="p">]</span> -</span><span id="L-31"><a href="#L-31"><span class="linenos">31</span></a> -</span><span id="L-32"><a href="#L-32"><span class="linenos">32</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">):</span> -</span><span id="L-33"><a href="#L-33"><span class="linenos">33</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-34"><a href="#L-34"><span class="linenos">34</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-35"><a href="#L-35"><span class="linenos">35</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-36"><a href="#L-36"><span class="linenos">36</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-37"><a href="#L-37"><span class="linenos">37</span></a> -</span><span id="L-38"><a href="#L-38"><span class="linenos">38</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-39"><a href="#L-39"><span class="linenos">39</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-40"><a href="#L-40"><span class="linenos">40</span></a> <span class="k">return</span> <span class="n">expression</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><span id="L-43"><a href="#L-43"><span class="linenos">43</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-44"><a href="#L-44"><span class="linenos">44</span></a><span class="w"> </span><span class="sd">"""</span> -</span><span id="L-45"><a href="#L-45"><span class="linenos">45</span></a><span class="sd"> Reorder joins by topological sort order based on predicate references.</span> -</span><span id="L-46"><a href="#L-46"><span class="linenos">46</span></a><span class="sd"> """</span> -</span><span id="L-47"><a href="#L-47"><span class="linenos">47</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-48"><a href="#L-48"><span class="linenos">48</span></a> <span class="n">head</span> <span class="o">=</span> <span class="n">from_</span><span class="o">.</span><span class="n">expressions</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> -</span><span id="L-49"><a href="#L-49"><span class="linenos">49</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-50"><a href="#L-50"><span class="linenos">50</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">this</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-51"><a href="#L-51"><span class="linenos">51</span></a> <span class="n">dag</span> <span class="o">=</span> <span class="p">{</span><span class="n">head</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span> <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">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-54"><a href="#L-54"><span class="linenos">54</span></a> <span class="n">dag</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span> -</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="n">parent</span><span class="o">.</span><span class="n">set</span><span class="p">(</span> -</span><span id="L-57"><a href="#L-57"><span class="linenos">57</span></a> <span class="s2">"joins"</span><span class="p">,</span> -</span><span id="L-58"><a href="#L-58"><span class="linenos">58</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">head</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">],</span> -</span><span id="L-59"><a href="#L-59"><span class="linenos">59</span></a> <span class="p">)</span> -</span><span id="L-60"><a href="#L-60"><span class="linenos">60</span></a> <span class="k">return</span> <span class="n">expression</span> -</span><span id="L-61"><a href="#L-61"><span class="linenos">61</span></a> -</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="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-64"><a href="#L-64"><span class="linenos">64</span></a><span class="w"> </span><span class="sd">"""</span> -</span><span id="L-65"><a href="#L-65"><span class="linenos">65</span></a><span class="sd"> Remove INNER and OUTER from joins as they are optional.</span> -</span><span id="L-66"><a href="#L-66"><span class="linenos">66</span></a><span class="sd"> """</span> -</span><span id="L-67"><a href="#L-67"><span class="linenos">67</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-68"><a href="#L-68"><span class="linenos">68</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-69"><a href="#L-69"><span class="linenos">69</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-70"><a href="#L-70"><span class="linenos">70</span></a> <span class="k">return</span> <span class="n">expression</span> -</span><span id="L-71"><a href="#L-71"><span class="linenos">71</span></a> +</span><span id="L-4"><a href="#L-4"><span class="linenos"> 4</span></a><span class="n">JOIN_ATTRS</span> <span class="o">=</span> <span class="p">(</span><span class="s2">"on"</span><span class="p">,</span> <span class="s2">"side"</span><span class="p">,</span> <span class="s2">"kind"</span><span class="p">,</span> <span class="s2">"using"</span><span class="p">,</span> <span class="s2">"natural"</span><span class="p">)</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">optimize_joins</span><span class="p">(</span><span class="n">expression</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">"""</span> +</span><span id="L-9"><a href="#L-9"><span class="linenos"> 9</span></a><span class="sd"> Removes cross joins if possible and reorder joins based on predicate dependencies.</span> +</span><span id="L-10"><a href="#L-10"><span class="linenos">10</span></a> +</span><span id="L-11"><a href="#L-11"><span class="linenos">11</span></a><span class="sd"> Example:</span> +</span><span id="L-12"><a href="#L-12"><span class="linenos">12</span></a><span class="sd"> >>> from sqlglot import parse_one</span> +</span><span id="L-13"><a href="#L-13"><span class="linenos">13</span></a><span class="sd"> >>> optimize_joins(parse_one("SELECT * FROM x CROSS JOIN y JOIN z ON x.a = z.a AND y.a = z.a")).sql()</span> +</span><span id="L-14"><a href="#L-14"><span class="linenos">14</span></a><span class="sd"> 'SELECT * FROM x JOIN z ON x.a = z.a AND TRUE JOIN y ON y.a = z.a'</span> +</span><span id="L-15"><a href="#L-15"><span class="linenos">15</span></a><span class="sd"> """</span> +</span><span id="L-16"><a href="#L-16"><span class="linenos">16</span></a> <span class="k">for</span> <span class="n">select</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</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-17"><a href="#L-17"><span class="linenos">17</span></a> <span class="n">references</span> <span class="o">=</span> <span class="p">{}</span> +</span><span id="L-18"><a href="#L-18"><span class="linenos">18</span></a> <span class="n">cross_joins</span> <span class="o">=</span> <span class="p">[]</span> +</span><span id="L-19"><a href="#L-19"><span class="linenos">19</span></a> +</span><span id="L-20"><a href="#L-20"><span class="linenos">20</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">select</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-21"><a href="#L-21"><span class="linenos">21</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">alias_or_name</span> +</span><span id="L-22"><a href="#L-22"><span class="linenos">22</span></a> <span class="n">tables</span> <span class="o">=</span> <span class="n">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span> +</span><span id="L-23"><a href="#L-23"><span class="linenos">23</span></a> +</span><span id="L-24"><a href="#L-24"><span class="linenos">24</span></a> <span class="k">if</span> <span class="n">tables</span><span class="p">:</span> +</span><span id="L-25"><a href="#L-25"><span class="linenos">25</span></a> <span class="k">for</span> <span class="n">table</span> <span class="ow">in</span> <span class="n">tables</span><span class="p">:</span> +</span><span id="L-26"><a href="#L-26"><span class="linenos">26</span></a> <span class="n">references</span><span class="p">[</span><span class="n">table</span><span class="p">]</span> <span class="o">=</span> <span class="n">references</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="p">[])</span> <span class="o">+</span> <span class="p">[</span><span class="n">join</span><span class="p">]</span> +</span><span id="L-27"><a href="#L-27"><span class="linenos">27</span></a> <span class="k">else</span><span class="p">:</span> +</span><span id="L-28"><a href="#L-28"><span class="linenos">28</span></a> <span class="n">cross_joins</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">name</span><span class="p">,</span> <span class="n">join</span><span class="p">))</span> +</span><span id="L-29"><a href="#L-29"><span class="linenos">29</span></a> +</span><span id="L-30"><a href="#L-30"><span class="linenos">30</span></a> <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">cross_joins</span><span class="p">:</span> +</span><span id="L-31"><a href="#L-31"><span class="linenos">31</span></a> <span class="k">for</span> <span class="n">dep</span> <span class="ow">in</span> <span class="n">references</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="p">[]):</span> +</span><span id="L-32"><a href="#L-32"><span class="linenos">32</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">dep</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"on"</span><span class="p">]</span> +</span><span id="L-33"><a href="#L-33"><span class="linenos">33</span></a> +</span><span id="L-34"><a href="#L-34"><span class="linenos">34</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">):</span> +</span><span id="L-35"><a href="#L-35"><span class="linenos">35</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-36"><a href="#L-36"><span class="linenos">36</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-37"><a href="#L-37"><span class="linenos">37</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-38"><a href="#L-38"><span class="linenos">38</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-39"><a href="#L-39"><span class="linenos">39</span></a> +</span><span id="L-40"><a href="#L-40"><span class="linenos">40</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-41"><a href="#L-41"><span class="linenos">41</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-42"><a href="#L-42"><span class="linenos">42</span></a> <span class="k">return</span> <span class="n">expression</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><span id="L-45"><a href="#L-45"><span class="linenos">45</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-46"><a href="#L-46"><span class="linenos">46</span></a><span class="w"> </span><span class="sd">"""</span> +</span><span id="L-47"><a href="#L-47"><span class="linenos">47</span></a><span class="sd"> Reorder joins by topological sort order based on predicate references.</span> +</span><span id="L-48"><a href="#L-48"><span class="linenos">48</span></a><span class="sd"> """</span> +</span><span id="L-49"><a href="#L-49"><span class="linenos">49</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-50"><a href="#L-50"><span class="linenos">50</span></a> <span class="n">head</span> <span class="o">=</span> <span class="n">from_</span><span class="o">.</span><span class="n">this</span> +</span><span id="L-51"><a href="#L-51"><span class="linenos">51</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-52"><a href="#L-52"><span class="linenos">52</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">this</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-53"><a href="#L-53"><span class="linenos">53</span></a> <span class="n">dag</span> <span class="o">=</span> <span class="p">{</span><span class="n">head</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span> <span class="p">[]}</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 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-56"><a href="#L-56"><span class="linenos">56</span></a> <span class="n">dag</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span> +</span><span id="L-57"><a href="#L-57"><span class="linenos">57</span></a> +</span><span id="L-58"><a href="#L-58"><span class="linenos">58</span></a> <span class="n">parent</span><span class="o">.</span><span class="n">set</span><span class="p">(</span> +</span><span id="L-59"><a href="#L-59"><span class="linenos">59</span></a> <span class="s2">"joins"</span><span class="p">,</span> +</span><span id="L-60"><a href="#L-60"><span class="linenos">60</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">head</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">],</span> +</span><span id="L-61"><a href="#L-61"><span class="linenos">61</span></a> <span class="p">)</span> +</span><span id="L-62"><a href="#L-62"><span class="linenos">62</span></a> <span class="k">return</span> <span class="n">expression</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><span id="L-65"><a href="#L-65"><span class="linenos">65</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-66"><a href="#L-66"><span class="linenos">66</span></a><span class="w"> </span><span class="sd">"""</span> +</span><span id="L-67"><a href="#L-67"><span class="linenos">67</span></a><span class="sd"> Remove INNER and OUTER from joins as they are optional.</span> +</span><span id="L-68"><a href="#L-68"><span class="linenos">68</span></a><span class="sd"> """</span> +</span><span id="L-69"><a href="#L-69"><span class="linenos">69</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-70"><a href="#L-70"><span class="linenos">70</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-71"><a href="#L-71"><span class="linenos">71</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-72"><a href="#L-72"><span class="linenos">72</span></a> -</span><span id="L-73"><a href="#L-73"><span class="linenos">73</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">exclude</span><span class="p">):</span> -</span><span id="L-74"><a href="#L-74"><span class="linenos">74</span></a> <span class="k">return</span> <span class="p">[</span> -</span><span id="L-75"><a href="#L-75"><span class="linenos">75</span></a> <span class="n">name</span> -</span><span id="L-76"><a href="#L-76"><span class="linenos">76</span></a> <span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</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="s2">"on"</span><span class="p">)</span> <span class="ow">or</span> <span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">()))</span> -</span><span id="L-77"><a href="#L-77"><span class="linenos">77</span></a> <span class="k">if</span> <span class="n">name</span> <span class="o">!=</span> <span class="n">exclude</span> -</span><span id="L-78"><a href="#L-78"><span class="linenos">78</span></a> <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="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-74"><a href="#L-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="kc">None</span><span class="p">)</span> +</span><span id="L-75"><a href="#L-75"><span class="linenos">75</span></a> <span class="k">return</span> <span class="n">expression</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><span id="L-78"><a href="#L-78"><span class="linenos">78</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">exclude</span><span class="p">):</span> +</span><span id="L-79"><a href="#L-79"><span class="linenos">79</span></a> <span class="k">return</span> <span class="p">[</span> +</span><span id="L-80"><a href="#L-80"><span class="linenos">80</span></a> <span class="n">name</span> +</span><span id="L-81"><a href="#L-81"><span class="linenos">81</span></a> <span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</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="s2">"on"</span><span class="p">)</span> <span class="ow">or</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">if</span> <span class="n">name</span> <span class="o">!=</span> <span class="n">exclude</span> +</span><span id="L-83"><a href="#L-83"><span class="linenos">83</span></a> <span class="p">]</span> </span></pre></div> @@ -158,42 +163,42 @@ </div> <a class="headerlink" href="#optimize_joins"></a> - <div class="pdoc-code codehilite"><pre><span></span><span id="optimize_joins-6"><a href="#optimize_joins-6"><span class="linenos"> 6</span></a><span class="k">def</span> <span class="nf">optimize_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span> -</span><span id="optimize_joins-7"><a href="#optimize_joins-7"><span class="linenos"> 7</span></a><span class="w"> </span><span class="sd">"""</span> -</span><span id="optimize_joins-8"><a href="#optimize_joins-8"><span class="linenos"> 8</span></a><span class="sd"> Removes cross joins if possible and reorder joins based on predicate dependencies.</span> -</span><span id="optimize_joins-9"><a href="#optimize_joins-9"><span class="linenos"> 9</span></a> -</span><span id="optimize_joins-10"><a href="#optimize_joins-10"><span class="linenos">10</span></a><span class="sd"> Example:</span> -</span><span id="optimize_joins-11"><a href="#optimize_joins-11"><span class="linenos">11</span></a><span class="sd"> >>> from sqlglot import parse_one</span> -</span><span id="optimize_joins-12"><a href="#optimize_joins-12"><span class="linenos">12</span></a><span class="sd"> >>> optimize_joins(parse_one("SELECT * FROM x CROSS JOIN y JOIN z ON x.a = z.a AND y.a = z.a")).sql()</span> -</span><span id="optimize_joins-13"><a href="#optimize_joins-13"><span class="linenos">13</span></a><span class="sd"> 'SELECT * FROM x JOIN z ON x.a = z.a AND TRUE JOIN y ON y.a = z.a'</span> -</span><span id="optimize_joins-14"><a href="#optimize_joins-14"><span class="linenos">14</span></a><span class="sd"> """</span> -</span><span id="optimize_joins-15"><a href="#optimize_joins-15"><span class="linenos">15</span></a> <span class="k">for</span> <span class="n">select</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</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="optimize_joins-16"><a href="#optimize_joins-16"><span class="linenos">16</span></a> <span class="n">references</span> <span class="o">=</span> <span class="p">{}</span> -</span><span id="optimize_joins-17"><a href="#optimize_joins-17"><span class="linenos">17</span></a> <span class="n">cross_joins</span> <span class="o">=</span> <span class="p">[]</span> -</span><span id="optimize_joins-18"><a href="#optimize_joins-18"><span class="linenos">18</span></a> -</span><span id="optimize_joins-19"><a href="#optimize_joins-19"><span class="linenos">19</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">select</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="optimize_joins-20"><a href="#optimize_joins-20"><span class="linenos">20</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">alias_or_name</span> -</span><span id="optimize_joins-21"><a href="#optimize_joins-21"><span class="linenos">21</span></a> <span class="n">tables</span> <span class="o">=</span> <span class="n">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span> -</span><span id="optimize_joins-22"><a href="#optimize_joins-22"><span class="linenos">22</span></a> -</span><span id="optimize_joins-23"><a href="#optimize_joins-23"><span class="linenos">23</span></a> <span class="k">if</span> <span class="n">tables</span><span class="p">:</span> -</span><span id="optimize_joins-24"><a href="#optimize_joins-24"><span class="linenos">24</span></a> <span class="k">for</span> <span class="n">table</span> <span class="ow">in</span> <span class="n">tables</span><span class="p">:</span> -</span><span id="optimize_joins-25"><a href="#optimize_joins-25"><span class="linenos">25</span></a> <span class="n">references</span><span class="p">[</span><span class="n">table</span><span class="p">]</span> <span class="o">=</span> <span class="n">references</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="p">[])</span> <span class="o">+</span> <span class="p">[</span><span class="n">join</span><span class="p">]</span> -</span><span id="optimize_joins-26"><a href="#optimize_joins-26"><span class="linenos">26</span></a> <span class="k">else</span><span class="p">:</span> -</span><span id="optimize_joins-27"><a href="#optimize_joins-27"><span class="linenos">27</span></a> <span class="n">cross_joins</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">name</span><span class="p">,</span> <span class="n">join</span><span class="p">))</span> -</span><span id="optimize_joins-28"><a href="#optimize_joins-28"><span class="linenos">28</span></a> -</span><span id="optimize_joins-29"><a href="#optimize_joins-29"><span class="linenos">29</span></a> <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">cross_joins</span><span class="p">:</span> -</span><span id="optimize_joins-30"><a href="#optimize_joins-30"><span class="linenos">30</span></a> <span class="k">for</span> <span class="n">dep</span> <span class="ow">in</span> <span class="n">references</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="p">[]):</span> -</span><span id="optimize_joins-31"><a href="#optimize_joins-31"><span class="linenos">31</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">dep</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"on"</span><span class="p">]</span> -</span><span id="optimize_joins-32"><a href="#optimize_joins-32"><span class="linenos">32</span></a> -</span><span id="optimize_joins-33"><a href="#optimize_joins-33"><span class="linenos">33</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">):</span> -</span><span id="optimize_joins-34"><a href="#optimize_joins-34"><span class="linenos">34</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-35"><a href="#optimize_joins-35"><span class="linenos">35</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-36"><a href="#optimize_joins-36"><span class="linenos">36</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-37"><a href="#optimize_joins-37"><span class="linenos">37</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-38"><a href="#optimize_joins-38"><span class="linenos">38</span></a> -</span><span id="optimize_joins-39"><a href="#optimize_joins-39"><span class="linenos">39</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-40"><a href="#optimize_joins-40"><span class="linenos">40</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-41"><a href="#optimize_joins-41"><span class="linenos">41</span></a> <span class="k">return</span> <span class="n">expression</span> + <div class="pdoc-code codehilite"><pre><span></span><span id="optimize_joins-8"><a href="#optimize_joins-8"><span class="linenos"> 8</span></a><span class="k">def</span> <span class="nf">optimize_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span> +</span><span id="optimize_joins-9"><a href="#optimize_joins-9"><span class="linenos"> 9</span></a><span class="w"> </span><span class="sd">"""</span> +</span><span id="optimize_joins-10"><a href="#optimize_joins-10"><span class="linenos">10</span></a><span class="sd"> Removes cross joins if possible and reorder joins based on predicate dependencies.</span> +</span><span id="optimize_joins-11"><a href="#optimize_joins-11"><span class="linenos">11</span></a> +</span><span id="optimize_joins-12"><a href="#optimize_joins-12"><span class="linenos">12</span></a><span class="sd"> Example:</span> +</span><span id="optimize_joins-13"><a href="#optimize_joins-13"><span class="linenos">13</span></a><span class="sd"> >>> from sqlglot import parse_one</span> +</span><span id="optimize_joins-14"><a href="#optimize_joins-14"><span class="linenos">14</span></a><span class="sd"> >>> optimize_joins(parse_one("SELECT * FROM x CROSS JOIN y JOIN z ON x.a = z.a AND y.a = z.a")).sql()</span> +</span><span id="optimize_joins-15"><a href="#optimize_joins-15"><span class="linenos">15</span></a><span class="sd"> 'SELECT * FROM x JOIN z ON x.a = z.a AND TRUE JOIN y ON y.a = z.a'</span> +</span><span id="optimize_joins-16"><a href="#optimize_joins-16"><span class="linenos">16</span></a><span class="sd"> """</span> +</span><span id="optimize_joins-17"><a href="#optimize_joins-17"><span class="linenos">17</span></a> <span class="k">for</span> <span class="n">select</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">find_all</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="optimize_joins-18"><a href="#optimize_joins-18"><span class="linenos">18</span></a> <span class="n">references</span> <span class="o">=</span> <span class="p">{}</span> +</span><span id="optimize_joins-19"><a href="#optimize_joins-19"><span class="linenos">19</span></a> <span class="n">cross_joins</span> <span class="o">=</span> <span class="p">[]</span> +</span><span id="optimize_joins-20"><a href="#optimize_joins-20"><span class="linenos">20</span></a> +</span><span id="optimize_joins-21"><a href="#optimize_joins-21"><span class="linenos">21</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">select</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="optimize_joins-22"><a href="#optimize_joins-22"><span class="linenos">22</span></a> <span class="n">name</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">alias_or_name</span> +</span><span id="optimize_joins-23"><a href="#optimize_joins-23"><span class="linenos">23</span></a> <span class="n">tables</span> <span class="o">=</span> <span class="n">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span> +</span><span id="optimize_joins-24"><a href="#optimize_joins-24"><span class="linenos">24</span></a> +</span><span id="optimize_joins-25"><a href="#optimize_joins-25"><span class="linenos">25</span></a> <span class="k">if</span> <span class="n">tables</span><span class="p">:</span> +</span><span id="optimize_joins-26"><a href="#optimize_joins-26"><span class="linenos">26</span></a> <span class="k">for</span> <span class="n">table</span> <span class="ow">in</span> <span class="n">tables</span><span class="p">:</span> +</span><span id="optimize_joins-27"><a href="#optimize_joins-27"><span class="linenos">27</span></a> <span class="n">references</span><span class="p">[</span><span class="n">table</span><span class="p">]</span> <span class="o">=</span> <span class="n">references</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="p">[])</span> <span class="o">+</span> <span class="p">[</span><span class="n">join</span><span class="p">]</span> +</span><span id="optimize_joins-28"><a href="#optimize_joins-28"><span class="linenos">28</span></a> <span class="k">else</span><span class="p">:</span> +</span><span id="optimize_joins-29"><a href="#optimize_joins-29"><span class="linenos">29</span></a> <span class="n">cross_joins</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">name</span><span class="p">,</span> <span class="n">join</span><span class="p">))</span> +</span><span id="optimize_joins-30"><a href="#optimize_joins-30"><span class="linenos">30</span></a> +</span><span id="optimize_joins-31"><a href="#optimize_joins-31"><span class="linenos">31</span></a> <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">cross_joins</span><span class="p">:</span> +</span><span id="optimize_joins-32"><a href="#optimize_joins-32"><span class="linenos">32</span></a> <span class="k">for</span> <span class="n">dep</span> <span class="ow">in</span> <span class="n">references</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="p">[]):</span> +</span><span id="optimize_joins-33"><a href="#optimize_joins-33"><span class="linenos">33</span></a> <span class="n">on</span> <span class="o">=</span> <span class="n">dep</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"on"</span><span class="p">]</span> +</span><span id="optimize_joins-34"><a href="#optimize_joins-34"><span class="linenos">34</span></a> +</span><span id="optimize_joins-35"><a href="#optimize_joins-35"><span class="linenos">35</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">on</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Connector</span><span class="p">):</span> +</span><span id="optimize_joins-36"><a href="#optimize_joins-36"><span class="linenos">36</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-37"><a href="#optimize_joins-37"><span class="linenos">37</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-38"><a href="#optimize_joins-38"><span class="linenos">38</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-39"><a href="#optimize_joins-39"><span class="linenos">39</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-40"><a href="#optimize_joins-40"><span class="linenos">40</span></a> +</span><span id="optimize_joins-41"><a href="#optimize_joins-41"><span class="linenos">41</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-42"><a href="#optimize_joins-42"><span class="linenos">42</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-43"><a href="#optimize_joins-43"><span class="linenos">43</span></a> <span class="k">return</span> <span class="n">expression</span> </span></pre></div> @@ -224,24 +229,24 @@ </div> <a class="headerlink" href="#reorder_joins"></a> - <div class="pdoc-code codehilite"><pre><span></span><span id="reorder_joins-44"><a href="#reorder_joins-44"><span class="linenos">44</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-45"><a href="#reorder_joins-45"><span class="linenos">45</span></a><span class="w"> </span><span class="sd">"""</span> -</span><span id="reorder_joins-46"><a href="#reorder_joins-46"><span class="linenos">46</span></a><span class="sd"> Reorder joins by topological sort order based on predicate references.</span> -</span><span id="reorder_joins-47"><a href="#reorder_joins-47"><span class="linenos">47</span></a><span class="sd"> """</span> -</span><span id="reorder_joins-48"><a href="#reorder_joins-48"><span class="linenos">48</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-49"><a href="#reorder_joins-49"><span class="linenos">49</span></a> <span class="n">head</span> <span class="o">=</span> <span class="n">from_</span><span class="o">.</span><span class="n">expressions</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> -</span><span id="reorder_joins-50"><a href="#reorder_joins-50"><span class="linenos">50</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-51"><a href="#reorder_joins-51"><span class="linenos">51</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">this</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-52"><a href="#reorder_joins-52"><span class="linenos">52</span></a> <span class="n">dag</span> <span class="o">=</span> <span class="p">{</span><span class="n">head</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span> <span class="p">[]}</span> -</span><span id="reorder_joins-53"><a href="#reorder_joins-53"><span class="linenos">53</span></a> -</span><span id="reorder_joins-54"><a href="#reorder_joins-54"><span class="linenos">54</span></a> <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-55"><a href="#reorder_joins-55"><span class="linenos">55</span></a> <span class="n">dag</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span> -</span><span id="reorder_joins-56"><a href="#reorder_joins-56"><span class="linenos">56</span></a> -</span><span id="reorder_joins-57"><a href="#reorder_joins-57"><span class="linenos">57</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-58"><a href="#reorder_joins-58"><span class="linenos">58</span></a> <span class="s2">"joins"</span><span class="p">,</span> -</span><span id="reorder_joins-59"><a href="#reorder_joins-59"><span class="linenos">59</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">head</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">],</span> -</span><span id="reorder_joins-60"><a href="#reorder_joins-60"><span class="linenos">60</span></a> <span class="p">)</span> -</span><span id="reorder_joins-61"><a href="#reorder_joins-61"><span class="linenos">61</span></a> <span class="k">return</span> <span class="n">expression</span> + <div class="pdoc-code codehilite"><pre><span></span><span id="reorder_joins-46"><a href="#reorder_joins-46"><span class="linenos">46</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-47"><a href="#reorder_joins-47"><span class="linenos">47</span></a><span class="w"> </span><span class="sd">"""</span> +</span><span id="reorder_joins-48"><a href="#reorder_joins-48"><span class="linenos">48</span></a><span class="sd"> Reorder joins by topological sort order based on predicate references.</span> +</span><span id="reorder_joins-49"><a href="#reorder_joins-49"><span class="linenos">49</span></a><span class="sd"> """</span> +</span><span id="reorder_joins-50"><a href="#reorder_joins-50"><span class="linenos">50</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-51"><a href="#reorder_joins-51"><span class="linenos">51</span></a> <span class="n">head</span> <span class="o">=</span> <span class="n">from_</span><span class="o">.</span><span class="n">this</span> +</span><span id="reorder_joins-52"><a href="#reorder_joins-52"><span class="linenos">52</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-53"><a href="#reorder_joins-53"><span class="linenos">53</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">this</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-54"><a href="#reorder_joins-54"><span class="linenos">54</span></a> <span class="n">dag</span> <span class="o">=</span> <span class="p">{</span><span class="n">head</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">:</span> <span class="p">[]}</span> +</span><span id="reorder_joins-55"><a href="#reorder_joins-55"><span class="linenos">55</span></a> +</span><span id="reorder_joins-56"><a href="#reorder_joins-56"><span class="linenos">56</span></a> <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-57"><a href="#reorder_joins-57"><span class="linenos">57</span></a> <span class="n">dag</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">other_table_names</span><span class="p">(</span><span class="n">join</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span> +</span><span id="reorder_joins-58"><a href="#reorder_joins-58"><span class="linenos">58</span></a> +</span><span id="reorder_joins-59"><a href="#reorder_joins-59"><span class="linenos">59</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-60"><a href="#reorder_joins-60"><span class="linenos">60</span></a> <span class="s2">"joins"</span><span class="p">,</span> +</span><span id="reorder_joins-61"><a href="#reorder_joins-61"><span class="linenos">61</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">head</span><span class="o">.</span><span class="n">alias_or_name</span><span class="p">],</span> +</span><span id="reorder_joins-62"><a href="#reorder_joins-62"><span class="linenos">62</span></a> <span class="p">)</span> +</span><span id="reorder_joins-63"><a href="#reorder_joins-63"><span class="linenos">63</span></a> <span class="k">return</span> <span class="n">expression</span> </span></pre></div> @@ -261,14 +266,17 @@ </div> <a class="headerlink" href="#normalize"></a> - <div class="pdoc-code codehilite"><pre><span></span><span id="normalize-64"><a href="#normalize-64"><span class="linenos">64</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-65"><a href="#normalize-65"><span class="linenos">65</span></a><span class="w"> </span><span class="sd">"""</span> -</span><span id="normalize-66"><a href="#normalize-66"><span class="linenos">66</span></a><span class="sd"> Remove INNER and OUTER from joins as they are optional.</span> -</span><span id="normalize-67"><a href="#normalize-67"><span class="linenos">67</span></a><span class="sd"> """</span> -</span><span id="normalize-68"><a href="#normalize-68"><span class="linenos">68</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-69"><a href="#normalize-69"><span class="linenos">69</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-70"><a href="#normalize-70"><span class="linenos">70</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-71"><a href="#normalize-71"><span class="linenos">71</span></a> <span class="k">return</span> <span class="n">expression</span> + <div class="pdoc-code codehilite"><pre><span></span><span id="normalize-66"><a href="#normalize-66"><span class="linenos">66</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-67"><a href="#normalize-67"><span class="linenos">67</span></a><span class="w"> </span><span class="sd">"""</span> +</span><span id="normalize-68"><a href="#normalize-68"><span class="linenos">68</span></a><span class="sd"> Remove INNER and OUTER from joins as they are optional.</span> +</span><span id="normalize-69"><a href="#normalize-69"><span class="linenos">69</span></a><span class="sd"> """</span> +</span><span id="normalize-70"><a href="#normalize-70"><span class="linenos">70</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-71"><a href="#normalize-71"><span class="linenos">71</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-72"><a href="#normalize-72"><span class="linenos">72</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-73"><a href="#normalize-73"><span class="linenos">73</span></a> +</span><span id="normalize-74"><a href="#normalize-74"><span class="linenos">74</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-75"><a href="#normalize-75"><span class="linenos">75</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-76"><a href="#normalize-76"><span class="linenos">76</span></a> <span class="k">return</span> <span class="n">expression</span> </span></pre></div> @@ -288,12 +296,12 @@ </div> <a class="headerlink" href="#other_table_names"></a> - <div class="pdoc-code codehilite"><pre><span></span><span id="other_table_names-74"><a href="#other_table_names-74"><span class="linenos">74</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">exclude</span><span class="p">):</span> -</span><span id="other_table_names-75"><a href="#other_table_names-75"><span class="linenos">75</span></a> <span class="k">return</span> <span class="p">[</span> -</span><span id="other_table_names-76"><a href="#other_table_names-76"><span class="linenos">76</span></a> <span class="n">name</span> -</span><span id="other_table_names-77"><a href="#other_table_names-77"><span class="linenos">77</span></a> <span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</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="s2">"on"</span><span class="p">)</span> <span class="ow">or</span> <span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">()))</span> -</span><span id="other_table_names-78"><a href="#other_table_names-78"><span class="linenos">78</span></a> <span class="k">if</span> <span class="n">name</span> <span class="o">!=</span> <span class="n">exclude</span> -</span><span id="other_table_names-79"><a href="#other_table_names-79"><span class="linenos">79</span></a> <span class="p">]</span> + <div class="pdoc-code codehilite"><pre><span></span><span id="other_table_names-79"><a href="#other_table_names-79"><span class="linenos">79</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">exclude</span><span class="p">):</span> +</span><span id="other_table_names-80"><a href="#other_table_names-80"><span class="linenos">80</span></a> <span class="k">return</span> <span class="p">[</span> +</span><span id="other_table_names-81"><a href="#other_table_names-81"><span class="linenos">81</span></a> <span class="n">name</span> +</span><span id="other_table_names-82"><a href="#other_table_names-82"><span class="linenos">82</span></a> <span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">column_table_names</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="s2">"on"</span><span class="p">)</span> <span class="ow">or</span> <span class="n">exp</span><span class="o">.</span><span class="n">true</span><span class="p">()))</span> +</span><span id="other_table_names-83"><a href="#other_table_names-83"><span class="linenos">83</span></a> <span class="k">if</span> <span class="n">name</span> <span class="o">!=</span> <span class="n">exclude</span> +</span><span id="other_table_names-84"><a href="#other_table_names-84"><span class="linenos">84</span></a> <span class="p">]</span> </span></pre></div> |