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diff --git a/docs/sqlglot/transforms.html b/docs/sqlglot/transforms.html index 160e2f1..dd37ff3 100644 --- a/docs/sqlglot/transforms.html +++ b/docs/sqlglot/transforms.html @@ -64,9 +64,6 @@ <a class="function" href="#epoch_cast_to_ts">epoch_cast_to_ts</a> </li> <li> - <a class="function" href="#timestamp_to_cast">timestamp_to_cast</a> - </li> - <li> <a class="function" href="#eliminate_semi_and_anti_joins">eliminate_semi_and_anti_joins</a> </li> <li> @@ -449,75 +446,66 @@ </span><span id="L-352"><a href="#L-352"><span class="linenos">352</span></a> <span class="k">return</span> <span class="n">expression</span> </span><span id="L-353"><a href="#L-353"><span class="linenos">353</span></a> </span><span id="L-354"><a href="#L-354"><span class="linenos">354</span></a> -</span><span id="L-355"><a href="#L-355"><span class="linenos">355</span></a><span class="k">def</span> <span class="nf">timestamp_to_cast</span><span class="p">(</span><span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">)</span> <span class="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span> -</span><span id="L-356"><a href="#L-356"><span class="linenos">356</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Timestamp</span><span class="p">)</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">expression</span><span class="o">.</span><span class="n">expression</span><span class="p">:</span> -</span><span id="L-357"><a href="#L-357"><span class="linenos">357</span></a> <span class="k">return</span> <span class="n">exp</span><span class="o">.</span><span class="n">cast</span><span class="p">(</span> -</span><span id="L-358"><a href="#L-358"><span class="linenos">358</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> -</span><span id="L-359"><a href="#L-359"><span class="linenos">359</span></a> <span class="n">to</span><span class="o">=</span><span class="n">exp</span><span class="o">.</span><span class="n">DataType</span><span class="o">.</span><span class="n">Type</span><span class="o">.</span><span class="n">TIMESTAMP</span><span class="p">,</span> -</span><span id="L-360"><a href="#L-360"><span class="linenos">360</span></a> <span class="p">)</span> -</span><span id="L-361"><a href="#L-361"><span class="linenos">361</span></a> <span class="k">return</span> <span class="n">expression</span> -</span><span id="L-362"><a href="#L-362"><span class="linenos">362</span></a> -</span><span id="L-363"><a href="#L-363"><span class="linenos">363</span></a> -</span><span id="L-364"><a href="#L-364"><span class="linenos">364</span></a><span class="k">def</span> <span class="nf">eliminate_semi_and_anti_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">)</span> <span class="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span> -</span><span id="L-365"><a href="#L-365"><span class="linenos">365</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">):</span> -</span><span id="L-366"><a href="#L-366"><span class="linenos">366</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">)</span> <span class="ow">or</span> <span class="p">[]:</span> -</span><span id="L-367"><a href="#L-367"><span class="linenos">367</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-368"><a href="#L-368"><span class="linenos">368</span></a> <span class="k">if</span> <span class="n">on</span> <span class="ow">and</span> <span class="n">join</span><span class="o">.</span><span class="n">kind</span> <span class="ow">in</span> <span class="p">(</span><span class="s2">"SEMI"</span><span class="p">,</span> <span class="s2">"ANTI"</span><span class="p">):</span> -</span><span id="L-369"><a href="#L-369"><span class="linenos">369</span></a> <span class="n">subquery</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="s2">"1"</span><span class="p">)</span><span class="o">.</span><span class="n">from_</span><span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="p">)</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">on</span><span class="p">)</span> -</span><span id="L-370"><a href="#L-370"><span class="linenos">370</span></a> <span class="n">exists</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">Exists</span><span class="p">(</span><span class="n">this</span><span class="o">=</span><span class="n">subquery</span><span class="p">)</span> -</span><span id="L-371"><a href="#L-371"><span class="linenos">371</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">"ANTI"</span><span class="p">:</span> -</span><span id="L-372"><a href="#L-372"><span class="linenos">372</span></a> <span class="n">exists</span> <span class="o">=</span> <span class="n">exists</span><span class="o">.</span><span class="n">not_</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-373"><a href="#L-373"><span class="linenos">373</span></a> -</span><span id="L-374"><a href="#L-374"><span class="linenos">374</span></a> <span class="n">join</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span> -</span><span id="L-375"><a href="#L-375"><span class="linenos">375</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">exists</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-376"><a href="#L-376"><span class="linenos">376</span></a> -</span><span id="L-377"><a href="#L-377"><span class="linenos">377</span></a> <span class="k">return</span> <span class="n">expression</span> +</span><span id="L-355"><a href="#L-355"><span class="linenos">355</span></a><span class="k">def</span> <span class="nf">eliminate_semi_and_anti_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">)</span> <span class="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span> +</span><span id="L-356"><a href="#L-356"><span class="linenos">356</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">):</span> +</span><span id="L-357"><a href="#L-357"><span class="linenos">357</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">)</span> <span class="ow">or</span> <span class="p">[]:</span> +</span><span id="L-358"><a href="#L-358"><span class="linenos">358</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-359"><a href="#L-359"><span class="linenos">359</span></a> <span class="k">if</span> <span class="n">on</span> <span class="ow">and</span> <span class="n">join</span><span class="o">.</span><span class="n">kind</span> <span class="ow">in</span> <span class="p">(</span><span class="s2">"SEMI"</span><span class="p">,</span> <span class="s2">"ANTI"</span><span class="p">):</span> +</span><span id="L-360"><a href="#L-360"><span class="linenos">360</span></a> <span class="n">subquery</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="s2">"1"</span><span class="p">)</span><span class="o">.</span><span class="n">from_</span><span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="p">)</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">on</span><span class="p">)</span> +</span><span id="L-361"><a href="#L-361"><span class="linenos">361</span></a> <span class="n">exists</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">Exists</span><span class="p">(</span><span class="n">this</span><span class="o">=</span><span class="n">subquery</span><span class="p">)</span> +</span><span id="L-362"><a href="#L-362"><span class="linenos">362</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">"ANTI"</span><span class="p">:</span> +</span><span id="L-363"><a href="#L-363"><span class="linenos">363</span></a> <span class="n">exists</span> <span class="o">=</span> <span class="n">exists</span><span class="o">.</span><span class="n">not_</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-364"><a href="#L-364"><span class="linenos">364</span></a> +</span><span id="L-365"><a href="#L-365"><span class="linenos">365</span></a> <span class="n">join</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span> +</span><span id="L-366"><a href="#L-366"><span class="linenos">366</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">exists</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-367"><a href="#L-367"><span class="linenos">367</span></a> +</span><span id="L-368"><a href="#L-368"><span class="linenos">368</span></a> <span class="k">return</span> <span class="n">expression</span> +</span><span id="L-369"><a href="#L-369"><span class="linenos">369</span></a> +</span><span id="L-370"><a href="#L-370"><span class="linenos">370</span></a> +</span><span id="L-371"><a href="#L-371"><span class="linenos">371</span></a><span class="k">def</span> <span class="nf">preprocess</span><span class="p">(</span> +</span><span id="L-372"><a href="#L-372"><span class="linenos">372</span></a> <span class="n">transforms</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">List</span><span class="p">[</span><span class="n">t</span><span class="o">.</span><span class="n">Callable</span><span class="p">[[</span><span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">],</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">]],</span> +</span><span id="L-373"><a href="#L-373"><span class="linenos">373</span></a><span class="p">)</span> <span class="o">-></span> <span class="n">t</span><span class="o">.</span><span class="n">Callable</span><span class="p">[[</span><span class="n">Generator</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">],</span> <span class="nb">str</span><span class="p">]:</span> +</span><span id="L-374"><a href="#L-374"><span class="linenos">374</span></a><span class="w"> </span><span class="sd">"""</span> +</span><span id="L-375"><a href="#L-375"><span class="linenos">375</span></a><span class="sd"> Creates a new transform by chaining a sequence of transformations and converts the resulting</span> +</span><span id="L-376"><a href="#L-376"><span class="linenos">376</span></a><span class="sd"> expression to SQL, using either the "_sql" method corresponding to the resulting expression,</span> +</span><span id="L-377"><a href="#L-377"><span class="linenos">377</span></a><span class="sd"> or the appropriate `Generator.TRANSFORMS` function (when applicable -- see below).</span> </span><span id="L-378"><a href="#L-378"><span class="linenos">378</span></a> -</span><span id="L-379"><a href="#L-379"><span class="linenos">379</span></a> -</span><span id="L-380"><a href="#L-380"><span class="linenos">380</span></a><span class="k">def</span> <span class="nf">preprocess</span><span class="p">(</span> -</span><span id="L-381"><a href="#L-381"><span class="linenos">381</span></a> <span class="n">transforms</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">List</span><span class="p">[</span><span class="n">t</span><span class="o">.</span><span class="n">Callable</span><span class="p">[[</span><span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">],</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">]],</span> -</span><span id="L-382"><a href="#L-382"><span class="linenos">382</span></a><span class="p">)</span> <span class="o">-></span> <span class="n">t</span><span class="o">.</span><span class="n">Callable</span><span class="p">[[</span><span class="n">Generator</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">],</span> <span class="nb">str</span><span class="p">]:</span> -</span><span id="L-383"><a href="#L-383"><span class="linenos">383</span></a><span class="w"> </span><span class="sd">"""</span> -</span><span id="L-384"><a href="#L-384"><span class="linenos">384</span></a><span class="sd"> Creates a new transform by chaining a sequence of transformations and converts the resulting</span> -</span><span id="L-385"><a href="#L-385"><span class="linenos">385</span></a><span class="sd"> expression to SQL, using either the "_sql" method corresponding to the resulting expression,</span> -</span><span id="L-386"><a href="#L-386"><span class="linenos">386</span></a><span class="sd"> or the appropriate `Generator.TRANSFORMS` function (when applicable -- see below).</span> -</span><span id="L-387"><a href="#L-387"><span class="linenos">387</span></a> -</span><span id="L-388"><a href="#L-388"><span class="linenos">388</span></a><span class="sd"> Args:</span> -</span><span id="L-389"><a href="#L-389"><span class="linenos">389</span></a><span class="sd"> transforms: sequence of transform functions. These will be called in order.</span> -</span><span id="L-390"><a href="#L-390"><span class="linenos">390</span></a> -</span><span id="L-391"><a href="#L-391"><span class="linenos">391</span></a><span class="sd"> Returns:</span> -</span><span id="L-392"><a href="#L-392"><span class="linenos">392</span></a><span class="sd"> Function that can be used as a generator transform.</span> -</span><span id="L-393"><a href="#L-393"><span class="linenos">393</span></a><span class="sd"> """</span> -</span><span id="L-394"><a href="#L-394"><span class="linenos">394</span></a> -</span><span id="L-395"><a href="#L-395"><span class="linenos">395</span></a> <span class="k">def</span> <span class="nf">_to_sql</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">)</span> <span class="o">-></span> <span class="nb">str</span><span class="p">:</span> -</span><span id="L-396"><a href="#L-396"><span class="linenos">396</span></a> <span class="n">expression_type</span> <span class="o">=</span> <span class="nb">type</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> -</span><span id="L-397"><a href="#L-397"><span class="linenos">397</span></a> -</span><span id="L-398"><a href="#L-398"><span class="linenos">398</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">transforms</span><span class="p">[</span><span class="mi">0</span><span class="p">](</span><span class="n">expression</span><span class="o">.</span><span class="n">copy</span><span class="p">())</span> -</span><span id="L-399"><a href="#L-399"><span class="linenos">399</span></a> <span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="n">transforms</span><span class="p">[</span><span class="mi">1</span><span class="p">:]:</span> -</span><span id="L-400"><a href="#L-400"><span class="linenos">400</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">t</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> -</span><span id="L-401"><a href="#L-401"><span class="linenos">401</span></a> -</span><span id="L-402"><a href="#L-402"><span class="linenos">402</span></a> <span class="n">_sql_handler</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="o">.</span><span class="n">key</span> <span class="o">+</span> <span class="s2">"_sql"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> -</span><span id="L-403"><a href="#L-403"><span class="linenos">403</span></a> <span class="k">if</span> <span class="n">_sql_handler</span><span class="p">:</span> -</span><span id="L-404"><a href="#L-404"><span class="linenos">404</span></a> <span class="k">return</span> <span class="n">_sql_handler</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> -</span><span id="L-405"><a href="#L-405"><span class="linenos">405</span></a> -</span><span id="L-406"><a href="#L-406"><span class="linenos">406</span></a> <span class="n">transforms_handler</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">TRANSFORMS</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="nb">type</span><span class="p">(</span><span class="n">expression</span><span class="p">))</span> -</span><span id="L-407"><a href="#L-407"><span class="linenos">407</span></a> <span class="k">if</span> <span class="n">transforms_handler</span><span class="p">:</span> -</span><span id="L-408"><a href="#L-408"><span class="linenos">408</span></a> <span class="k">if</span> <span class="n">expression_type</span> <span class="ow">is</span> <span class="nb">type</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span> -</span><span id="L-409"><a href="#L-409"><span class="linenos">409</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Func</span><span class="p">):</span> -</span><span id="L-410"><a href="#L-410"><span class="linenos">410</span></a> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">function_fallback_sql</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> +</span><span id="L-379"><a href="#L-379"><span class="linenos">379</span></a><span class="sd"> Args:</span> +</span><span id="L-380"><a href="#L-380"><span class="linenos">380</span></a><span class="sd"> transforms: sequence of transform functions. These will be called in order.</span> +</span><span id="L-381"><a href="#L-381"><span class="linenos">381</span></a> +</span><span id="L-382"><a href="#L-382"><span class="linenos">382</span></a><span class="sd"> Returns:</span> +</span><span id="L-383"><a href="#L-383"><span class="linenos">383</span></a><span class="sd"> Function that can be used as a generator transform.</span> +</span><span id="L-384"><a href="#L-384"><span class="linenos">384</span></a><span class="sd"> """</span> +</span><span id="L-385"><a href="#L-385"><span class="linenos">385</span></a> +</span><span id="L-386"><a href="#L-386"><span class="linenos">386</span></a> <span class="k">def</span> <span class="nf">_to_sql</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">)</span> <span class="o">-></span> <span class="nb">str</span><span class="p">:</span> +</span><span id="L-387"><a href="#L-387"><span class="linenos">387</span></a> <span class="n">expression_type</span> <span class="o">=</span> <span class="nb">type</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> +</span><span id="L-388"><a href="#L-388"><span class="linenos">388</span></a> +</span><span id="L-389"><a href="#L-389"><span class="linenos">389</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">transforms</span><span class="p">[</span><span class="mi">0</span><span class="p">](</span><span class="n">expression</span><span class="o">.</span><span class="n">copy</span><span class="p">())</span> +</span><span id="L-390"><a href="#L-390"><span class="linenos">390</span></a> <span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="n">transforms</span><span class="p">[</span><span class="mi">1</span><span class="p">:]:</span> +</span><span id="L-391"><a href="#L-391"><span class="linenos">391</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">t</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> +</span><span id="L-392"><a href="#L-392"><span class="linenos">392</span></a> +</span><span id="L-393"><a href="#L-393"><span class="linenos">393</span></a> <span class="n">_sql_handler</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="o">.</span><span class="n">key</span> <span class="o">+</span> <span class="s2">"_sql"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> +</span><span id="L-394"><a href="#L-394"><span class="linenos">394</span></a> <span class="k">if</span> <span class="n">_sql_handler</span><span class="p">:</span> +</span><span id="L-395"><a href="#L-395"><span class="linenos">395</span></a> <span class="k">return</span> <span class="n">_sql_handler</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> +</span><span id="L-396"><a href="#L-396"><span class="linenos">396</span></a> +</span><span id="L-397"><a href="#L-397"><span class="linenos">397</span></a> <span class="n">transforms_handler</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">TRANSFORMS</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="nb">type</span><span class="p">(</span><span class="n">expression</span><span class="p">))</span> +</span><span id="L-398"><a href="#L-398"><span class="linenos">398</span></a> <span class="k">if</span> <span class="n">transforms_handler</span><span class="p">:</span> +</span><span id="L-399"><a href="#L-399"><span class="linenos">399</span></a> <span class="k">if</span> <span class="n">expression_type</span> <span class="ow">is</span> <span class="nb">type</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span> +</span><span id="L-400"><a href="#L-400"><span class="linenos">400</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Func</span><span class="p">):</span> +</span><span id="L-401"><a href="#L-401"><span class="linenos">401</span></a> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">function_fallback_sql</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> +</span><span id="L-402"><a href="#L-402"><span class="linenos">402</span></a> +</span><span id="L-403"><a href="#L-403"><span class="linenos">403</span></a> <span class="c1"># Ensures we don't enter an infinite loop. This can happen when the original expression</span> +</span><span id="L-404"><a href="#L-404"><span class="linenos">404</span></a> <span class="c1"># has the same type as the final expression and there's no _sql method available for it,</span> +</span><span id="L-405"><a href="#L-405"><span class="linenos">405</span></a> <span class="c1"># because then it'd re-enter _to_sql.</span> +</span><span id="L-406"><a href="#L-406"><span class="linenos">406</span></a> <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span> +</span><span id="L-407"><a href="#L-407"><span class="linenos">407</span></a> <span class="sa">f</span><span class="s2">"Expression type </span><span class="si">{</span><span class="n">expression</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span><span class="si">}</span><span class="s2"> requires a _sql method in order to be transformed."</span> +</span><span id="L-408"><a href="#L-408"><span class="linenos">408</span></a> <span class="p">)</span> +</span><span id="L-409"><a href="#L-409"><span class="linenos">409</span></a> +</span><span id="L-410"><a href="#L-410"><span class="linenos">410</span></a> <span class="k">return</span> <span class="n">transforms_handler</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="p">)</span> </span><span id="L-411"><a href="#L-411"><span class="linenos">411</span></a> -</span><span id="L-412"><a href="#L-412"><span class="linenos">412</span></a> <span class="c1"># Ensures we don't enter an infinite loop. This can happen when the original expression</span> -</span><span id="L-413"><a href="#L-413"><span class="linenos">413</span></a> <span class="c1"># has the same type as the final expression and there's no _sql method available for it,</span> -</span><span id="L-414"><a href="#L-414"><span class="linenos">414</span></a> <span class="c1"># because then it'd re-enter _to_sql.</span> -</span><span id="L-415"><a href="#L-415"><span class="linenos">415</span></a> <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span> -</span><span id="L-416"><a href="#L-416"><span class="linenos">416</span></a> <span class="sa">f</span><span class="s2">"Expression type </span><span class="si">{</span><span class="n">expression</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span><span class="si">}</span><span class="s2"> requires a _sql method in order to be transformed."</span> -</span><span id="L-417"><a href="#L-417"><span class="linenos">417</span></a> <span class="p">)</span> -</span><span id="L-418"><a href="#L-418"><span class="linenos">418</span></a> -</span><span id="L-419"><a href="#L-419"><span class="linenos">419</span></a> <span class="k">return</span> <span class="n">transforms_handler</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="p">)</span> -</span><span id="L-420"><a href="#L-420"><span class="linenos">420</span></a> -</span><span id="L-421"><a href="#L-421"><span class="linenos">421</span></a> <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="sa">f</span><span class="s2">"Unsupported expression type </span><span class="si">{</span><span class="n">expression</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span><span class="si">}</span><span class="s2">."</span><span class="p">)</span> -</span><span id="L-422"><a href="#L-422"><span class="linenos">422</span></a> -</span><span id="L-423"><a href="#L-423"><span class="linenos">423</span></a> <span class="k">return</span> <span class="n">_to_sql</span> +</span><span id="L-412"><a href="#L-412"><span class="linenos">412</span></a> <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="sa">f</span><span class="s2">"Unsupported expression type </span><span class="si">{</span><span class="n">expression</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span><span class="si">}</span><span class="s2">."</span><span class="p">)</span> +</span><span id="L-413"><a href="#L-413"><span class="linenos">413</span></a> +</span><span id="L-414"><a href="#L-414"><span class="linenos">414</span></a> <span class="k">return</span> <span class="n">_to_sql</span> </span></pre></div> @@ -1080,30 +1068,6 @@ other expressions. This transforms removes the precision from parameterized type </section> - <section id="timestamp_to_cast"> - <input id="timestamp_to_cast-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1"> -<div class="attr function"> - - <span class="def">def</span> - <span class="name">timestamp_to_cast</span><span class="signature pdoc-code multiline">(<span class="param"> <span class="n">expression</span><span class="p">:</span> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span></span><span class="return-annotation">) -> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span>:</span></span> - - <label class="view-source-button" for="timestamp_to_cast-view-source"><span>View Source</span></label> - - </div> - <a class="headerlink" href="#timestamp_to_cast"></a> - <div class="pdoc-code codehilite"><pre><span></span><span id="timestamp_to_cast-356"><a href="#timestamp_to_cast-356"><span class="linenos">356</span></a><span class="k">def</span> <span class="nf">timestamp_to_cast</span><span class="p">(</span><span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">)</span> <span class="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span> -</span><span id="timestamp_to_cast-357"><a href="#timestamp_to_cast-357"><span class="linenos">357</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Timestamp</span><span class="p">)</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">expression</span><span class="o">.</span><span class="n">expression</span><span class="p">:</span> -</span><span id="timestamp_to_cast-358"><a href="#timestamp_to_cast-358"><span class="linenos">358</span></a> <span class="k">return</span> <span class="n">exp</span><span class="o">.</span><span class="n">cast</span><span class="p">(</span> -</span><span id="timestamp_to_cast-359"><a href="#timestamp_to_cast-359"><span class="linenos">359</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> -</span><span id="timestamp_to_cast-360"><a href="#timestamp_to_cast-360"><span class="linenos">360</span></a> <span class="n">to</span><span class="o">=</span><span class="n">exp</span><span class="o">.</span><span class="n">DataType</span><span class="o">.</span><span class="n">Type</span><span class="o">.</span><span class="n">TIMESTAMP</span><span class="p">,</span> -</span><span id="timestamp_to_cast-361"><a href="#timestamp_to_cast-361"><span class="linenos">361</span></a> <span class="p">)</span> -</span><span id="timestamp_to_cast-362"><a href="#timestamp_to_cast-362"><span class="linenos">362</span></a> <span class="k">return</span> <span class="n">expression</span> -</span></pre></div> - - - - - </section> <section id="eliminate_semi_and_anti_joins"> <input id="eliminate_semi_and_anti_joins-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1"> <div class="attr function"> @@ -1115,20 +1079,20 @@ other expressions. This transforms removes the precision from parameterized type </div> <a class="headerlink" href="#eliminate_semi_and_anti_joins"></a> - <div class="pdoc-code codehilite"><pre><span></span><span id="eliminate_semi_and_anti_joins-365"><a href="#eliminate_semi_and_anti_joins-365"><span class="linenos">365</span></a><span class="k">def</span> <span class="nf">eliminate_semi_and_anti_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">)</span> <span class="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span> -</span><span id="eliminate_semi_and_anti_joins-366"><a href="#eliminate_semi_and_anti_joins-366"><span class="linenos">366</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">):</span> -</span><span id="eliminate_semi_and_anti_joins-367"><a href="#eliminate_semi_and_anti_joins-367"><span class="linenos">367</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">)</span> <span class="ow">or</span> <span class="p">[]:</span> -</span><span id="eliminate_semi_and_anti_joins-368"><a href="#eliminate_semi_and_anti_joins-368"><span class="linenos">368</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="eliminate_semi_and_anti_joins-369"><a href="#eliminate_semi_and_anti_joins-369"><span class="linenos">369</span></a> <span class="k">if</span> <span class="n">on</span> <span class="ow">and</span> <span class="n">join</span><span class="o">.</span><span class="n">kind</span> <span class="ow">in</span> <span class="p">(</span><span class="s2">"SEMI"</span><span class="p">,</span> <span class="s2">"ANTI"</span><span class="p">):</span> -</span><span id="eliminate_semi_and_anti_joins-370"><a href="#eliminate_semi_and_anti_joins-370"><span class="linenos">370</span></a> <span class="n">subquery</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="s2">"1"</span><span class="p">)</span><span class="o">.</span><span class="n">from_</span><span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="p">)</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">on</span><span class="p">)</span> -</span><span id="eliminate_semi_and_anti_joins-371"><a href="#eliminate_semi_and_anti_joins-371"><span class="linenos">371</span></a> <span class="n">exists</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">Exists</span><span class="p">(</span><span class="n">this</span><span class="o">=</span><span class="n">subquery</span><span class="p">)</span> -</span><span id="eliminate_semi_and_anti_joins-372"><a href="#eliminate_semi_and_anti_joins-372"><span class="linenos">372</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">"ANTI"</span><span class="p">:</span> -</span><span id="eliminate_semi_and_anti_joins-373"><a href="#eliminate_semi_and_anti_joins-373"><span class="linenos">373</span></a> <span class="n">exists</span> <span class="o">=</span> <span class="n">exists</span><span class="o">.</span><span class="n">not_</span><span class="p">(</span><span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span> -</span><span id="eliminate_semi_and_anti_joins-374"><a href="#eliminate_semi_and_anti_joins-374"><span class="linenos">374</span></a> -</span><span id="eliminate_semi_and_anti_joins-375"><a href="#eliminate_semi_and_anti_joins-375"><span class="linenos">375</span></a> <span class="n">join</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span> -</span><span id="eliminate_semi_and_anti_joins-376"><a href="#eliminate_semi_and_anti_joins-376"><span class="linenos">376</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">exists</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span> -</span><span id="eliminate_semi_and_anti_joins-377"><a href="#eliminate_semi_and_anti_joins-377"><span class="linenos">377</span></a> -</span><span id="eliminate_semi_and_anti_joins-378"><a href="#eliminate_semi_and_anti_joins-378"><span class="linenos">378</span></a> <span class="k">return</span> <span class="n">expression</span> + <div class="pdoc-code codehilite"><pre><span></span><span id="eliminate_semi_and_anti_joins-356"><a href="#eliminate_semi_and_anti_joins-356"><span class="linenos">356</span></a><span class="k">def</span> <span class="nf">eliminate_semi_and_anti_joins</span><span class="p">(</span><span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">)</span> <span class="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span> +</span><span id="eliminate_semi_and_anti_joins-357"><a href="#eliminate_semi_and_anti_joins-357"><span class="linenos">357</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">):</span> +</span><span id="eliminate_semi_and_anti_joins-358"><a href="#eliminate_semi_and_anti_joins-358"><span class="linenos">358</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">)</span> <span class="ow">or</span> <span class="p">[]:</span> +</span><span id="eliminate_semi_and_anti_joins-359"><a href="#eliminate_semi_and_anti_joins-359"><span class="linenos">359</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="eliminate_semi_and_anti_joins-360"><a href="#eliminate_semi_and_anti_joins-360"><span class="linenos">360</span></a> <span class="k">if</span> <span class="n">on</span> <span class="ow">and</span> <span class="n">join</span><span class="o">.</span><span class="n">kind</span> <span class="ow">in</span> <span class="p">(</span><span class="s2">"SEMI"</span><span class="p">,</span> <span class="s2">"ANTI"</span><span class="p">):</span> +</span><span id="eliminate_semi_and_anti_joins-361"><a href="#eliminate_semi_and_anti_joins-361"><span class="linenos">361</span></a> <span class="n">subquery</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="s2">"1"</span><span class="p">)</span><span class="o">.</span><span class="n">from_</span><span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">this</span><span class="p">)</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">on</span><span class="p">)</span> +</span><span id="eliminate_semi_and_anti_joins-362"><a href="#eliminate_semi_and_anti_joins-362"><span class="linenos">362</span></a> <span class="n">exists</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">Exists</span><span class="p">(</span><span class="n">this</span><span class="o">=</span><span class="n">subquery</span><span class="p">)</span> +</span><span id="eliminate_semi_and_anti_joins-363"><a href="#eliminate_semi_and_anti_joins-363"><span class="linenos">363</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">"ANTI"</span><span class="p">:</span> +</span><span id="eliminate_semi_and_anti_joins-364"><a href="#eliminate_semi_and_anti_joins-364"><span class="linenos">364</span></a> <span class="n">exists</span> <span class="o">=</span> <span class="n">exists</span><span class="o">.</span><span class="n">not_</span><span class="p">(</span><span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span> +</span><span id="eliminate_semi_and_anti_joins-365"><a href="#eliminate_semi_and_anti_joins-365"><span class="linenos">365</span></a> +</span><span id="eliminate_semi_and_anti_joins-366"><a href="#eliminate_semi_and_anti_joins-366"><span class="linenos">366</span></a> <span class="n">join</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span> +</span><span id="eliminate_semi_and_anti_joins-367"><a href="#eliminate_semi_and_anti_joins-367"><span class="linenos">367</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">exists</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span> +</span><span id="eliminate_semi_and_anti_joins-368"><a href="#eliminate_semi_and_anti_joins-368"><span class="linenos">368</span></a> +</span><span id="eliminate_semi_and_anti_joins-369"><a href="#eliminate_semi_and_anti_joins-369"><span class="linenos">369</span></a> <span class="k">return</span> <span class="n">expression</span> </span></pre></div> @@ -1146,50 +1110,50 @@ other expressions. This transforms removes the precision from parameterized type </div> <a class="headerlink" href="#preprocess"></a> - <div class="pdoc-code codehilite"><pre><span></span><span id="preprocess-381"><a href="#preprocess-381"><span class="linenos">381</span></a><span class="k">def</span> <span class="nf">preprocess</span><span class="p">(</span> -</span><span id="preprocess-382"><a href="#preprocess-382"><span class="linenos">382</span></a> <span class="n">transforms</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">List</span><span class="p">[</span><span class="n">t</span><span class="o">.</span><span class="n">Callable</span><span class="p">[[</span><span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">],</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">]],</span> -</span><span id="preprocess-383"><a href="#preprocess-383"><span class="linenos">383</span></a><span class="p">)</span> <span class="o">-></span> <span class="n">t</span><span class="o">.</span><span class="n">Callable</span><span class="p">[[</span><span class="n">Generator</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">],</span> <span class="nb">str</span><span class="p">]:</span> -</span><span id="preprocess-384"><a href="#preprocess-384"><span class="linenos">384</span></a><span class="w"> </span><span class="sd">"""</span> -</span><span id="preprocess-385"><a href="#preprocess-385"><span class="linenos">385</span></a><span class="sd"> Creates a new transform by chaining a sequence of transformations and converts the resulting</span> -</span><span id="preprocess-386"><a href="#preprocess-386"><span class="linenos">386</span></a><span class="sd"> expression to SQL, using either the "_sql" method corresponding to the resulting expression,</span> -</span><span id="preprocess-387"><a href="#preprocess-387"><span class="linenos">387</span></a><span class="sd"> or the appropriate `Generator.TRANSFORMS` function (when applicable -- see below).</span> -</span><span id="preprocess-388"><a href="#preprocess-388"><span class="linenos">388</span></a> -</span><span id="preprocess-389"><a href="#preprocess-389"><span class="linenos">389</span></a><span class="sd"> Args:</span> -</span><span id="preprocess-390"><a href="#preprocess-390"><span class="linenos">390</span></a><span class="sd"> transforms: sequence of transform functions. These will be called in order.</span> -</span><span id="preprocess-391"><a href="#preprocess-391"><span class="linenos">391</span></a> -</span><span id="preprocess-392"><a href="#preprocess-392"><span class="linenos">392</span></a><span class="sd"> Returns:</span> -</span><span id="preprocess-393"><a href="#preprocess-393"><span class="linenos">393</span></a><span class="sd"> Function that can be used as a generator transform.</span> -</span><span id="preprocess-394"><a href="#preprocess-394"><span class="linenos">394</span></a><span class="sd"> """</span> -</span><span id="preprocess-395"><a href="#preprocess-395"><span class="linenos">395</span></a> -</span><span id="preprocess-396"><a href="#preprocess-396"><span class="linenos">396</span></a> <span class="k">def</span> <span class="nf">_to_sql</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">)</span> <span class="o">-></span> <span class="nb">str</span><span class="p">:</span> -</span><span id="preprocess-397"><a href="#preprocess-397"><span class="linenos">397</span></a> <span class="n">expression_type</span> <span class="o">=</span> <span class="nb">type</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> -</span><span id="preprocess-398"><a href="#preprocess-398"><span class="linenos">398</span></a> -</span><span id="preprocess-399"><a href="#preprocess-399"><span class="linenos">399</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">transforms</span><span class="p">[</span><span class="mi">0</span><span class="p">](</span><span class="n">expression</span><span class="o">.</span><span class="n">copy</span><span class="p">())</span> -</span><span id="preprocess-400"><a href="#preprocess-400"><span class="linenos">400</span></a> <span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="n">transforms</span><span class="p">[</span><span class="mi">1</span><span class="p">:]:</span> -</span><span id="preprocess-401"><a href="#preprocess-401"><span class="linenos">401</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">t</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> -</span><span id="preprocess-402"><a href="#preprocess-402"><span class="linenos">402</span></a> -</span><span id="preprocess-403"><a href="#preprocess-403"><span class="linenos">403</span></a> <span class="n">_sql_handler</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="o">.</span><span class="n">key</span> <span class="o">+</span> <span class="s2">"_sql"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> -</span><span id="preprocess-404"><a href="#preprocess-404"><span class="linenos">404</span></a> <span class="k">if</span> <span class="n">_sql_handler</span><span class="p">:</span> -</span><span id="preprocess-405"><a href="#preprocess-405"><span class="linenos">405</span></a> <span class="k">return</span> <span class="n">_sql_handler</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> -</span><span id="preprocess-406"><a href="#preprocess-406"><span class="linenos">406</span></a> -</span><span id="preprocess-407"><a href="#preprocess-407"><span class="linenos">407</span></a> <span class="n">transforms_handler</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">TRANSFORMS</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="nb">type</span><span class="p">(</span><span class="n">expression</span><span class="p">))</span> -</span><span id="preprocess-408"><a href="#preprocess-408"><span class="linenos">408</span></a> <span class="k">if</span> <span class="n">transforms_handler</span><span class="p">:</span> -</span><span id="preprocess-409"><a href="#preprocess-409"><span class="linenos">409</span></a> <span class="k">if</span> <span class="n">expression_type</span> <span class="ow">is</span> <span class="nb">type</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span> -</span><span id="preprocess-410"><a href="#preprocess-410"><span class="linenos">410</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Func</span><span class="p">):</span> -</span><span id="preprocess-411"><a href="#preprocess-411"><span class="linenos">411</span></a> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">function_fallback_sql</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> + <div class="pdoc-code codehilite"><pre><span></span><span id="preprocess-372"><a href="#preprocess-372"><span class="linenos">372</span></a><span class="k">def</span> <span class="nf">preprocess</span><span class="p">(</span> +</span><span id="preprocess-373"><a href="#preprocess-373"><span class="linenos">373</span></a> <span class="n">transforms</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">List</span><span class="p">[</span><span class="n">t</span><span class="o">.</span><span class="n">Callable</span><span class="p">[[</span><span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">],</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">]],</span> +</span><span id="preprocess-374"><a href="#preprocess-374"><span class="linenos">374</span></a><span class="p">)</span> <span class="o">-></span> <span class="n">t</span><span class="o">.</span><span class="n">Callable</span><span class="p">[[</span><span class="n">Generator</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">],</span> <span class="nb">str</span><span class="p">]:</span> +</span><span id="preprocess-375"><a href="#preprocess-375"><span class="linenos">375</span></a><span class="w"> </span><span class="sd">"""</span> +</span><span id="preprocess-376"><a href="#preprocess-376"><span class="linenos">376</span></a><span class="sd"> Creates a new transform by chaining a sequence of transformations and converts the resulting</span> +</span><span id="preprocess-377"><a href="#preprocess-377"><span class="linenos">377</span></a><span class="sd"> expression to SQL, using either the "_sql" method corresponding to the resulting expression,</span> +</span><span id="preprocess-378"><a href="#preprocess-378"><span class="linenos">378</span></a><span class="sd"> or the appropriate `Generator.TRANSFORMS` function (when applicable -- see below).</span> +</span><span id="preprocess-379"><a href="#preprocess-379"><span class="linenos">379</span></a> +</span><span id="preprocess-380"><a href="#preprocess-380"><span class="linenos">380</span></a><span class="sd"> Args:</span> +</span><span id="preprocess-381"><a href="#preprocess-381"><span class="linenos">381</span></a><span class="sd"> transforms: sequence of transform functions. These will be called in order.</span> +</span><span id="preprocess-382"><a href="#preprocess-382"><span class="linenos">382</span></a> +</span><span id="preprocess-383"><a href="#preprocess-383"><span class="linenos">383</span></a><span class="sd"> Returns:</span> +</span><span id="preprocess-384"><a href="#preprocess-384"><span class="linenos">384</span></a><span class="sd"> Function that can be used as a generator transform.</span> +</span><span id="preprocess-385"><a href="#preprocess-385"><span class="linenos">385</span></a><span class="sd"> """</span> +</span><span id="preprocess-386"><a href="#preprocess-386"><span class="linenos">386</span></a> +</span><span id="preprocess-387"><a href="#preprocess-387"><span class="linenos">387</span></a> <span class="k">def</span> <span class="nf">_to_sql</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">)</span> <span class="o">-></span> <span class="nb">str</span><span class="p">:</span> +</span><span id="preprocess-388"><a href="#preprocess-388"><span class="linenos">388</span></a> <span class="n">expression_type</span> <span class="o">=</span> <span class="nb">type</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> +</span><span id="preprocess-389"><a href="#preprocess-389"><span class="linenos">389</span></a> +</span><span id="preprocess-390"><a href="#preprocess-390"><span class="linenos">390</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">transforms</span><span class="p">[</span><span class="mi">0</span><span class="p">](</span><span class="n">expression</span><span class="o">.</span><span class="n">copy</span><span class="p">())</span> +</span><span id="preprocess-391"><a href="#preprocess-391"><span class="linenos">391</span></a> <span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="n">transforms</span><span class="p">[</span><span class="mi">1</span><span class="p">:]:</span> +</span><span id="preprocess-392"><a href="#preprocess-392"><span class="linenos">392</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">t</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> +</span><span id="preprocess-393"><a href="#preprocess-393"><span class="linenos">393</span></a> +</span><span id="preprocess-394"><a href="#preprocess-394"><span class="linenos">394</span></a> <span class="n">_sql_handler</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="o">.</span><span class="n">key</span> <span class="o">+</span> <span class="s2">"_sql"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> +</span><span id="preprocess-395"><a href="#preprocess-395"><span class="linenos">395</span></a> <span class="k">if</span> <span class="n">_sql_handler</span><span class="p">:</span> +</span><span id="preprocess-396"><a href="#preprocess-396"><span class="linenos">396</span></a> <span class="k">return</span> <span class="n">_sql_handler</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> +</span><span id="preprocess-397"><a href="#preprocess-397"><span class="linenos">397</span></a> +</span><span id="preprocess-398"><a href="#preprocess-398"><span class="linenos">398</span></a> <span class="n">transforms_handler</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">TRANSFORMS</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="nb">type</span><span class="p">(</span><span class="n">expression</span><span class="p">))</span> +</span><span id="preprocess-399"><a href="#preprocess-399"><span class="linenos">399</span></a> <span class="k">if</span> <span class="n">transforms_handler</span><span class="p">:</span> +</span><span id="preprocess-400"><a href="#preprocess-400"><span class="linenos">400</span></a> <span class="k">if</span> <span class="n">expression_type</span> <span class="ow">is</span> <span class="nb">type</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span> +</span><span id="preprocess-401"><a href="#preprocess-401"><span class="linenos">401</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Func</span><span class="p">):</span> +</span><span id="preprocess-402"><a href="#preprocess-402"><span class="linenos">402</span></a> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">function_fallback_sql</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> +</span><span id="preprocess-403"><a href="#preprocess-403"><span class="linenos">403</span></a> +</span><span id="preprocess-404"><a href="#preprocess-404"><span class="linenos">404</span></a> <span class="c1"># Ensures we don't enter an infinite loop. This can happen when the original expression</span> +</span><span id="preprocess-405"><a href="#preprocess-405"><span class="linenos">405</span></a> <span class="c1"># has the same type as the final expression and there's no _sql method available for it,</span> +</span><span id="preprocess-406"><a href="#preprocess-406"><span class="linenos">406</span></a> <span class="c1"># because then it'd re-enter _to_sql.</span> +</span><span id="preprocess-407"><a href="#preprocess-407"><span class="linenos">407</span></a> <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span> +</span><span id="preprocess-408"><a href="#preprocess-408"><span class="linenos">408</span></a> <span class="sa">f</span><span class="s2">"Expression type </span><span class="si">{</span><span class="n">expression</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span><span class="si">}</span><span class="s2"> requires a _sql method in order to be transformed."</span> +</span><span id="preprocess-409"><a href="#preprocess-409"><span class="linenos">409</span></a> <span class="p">)</span> +</span><span id="preprocess-410"><a href="#preprocess-410"><span class="linenos">410</span></a> +</span><span id="preprocess-411"><a href="#preprocess-411"><span class="linenos">411</span></a> <span class="k">return</span> <span class="n">transforms_handler</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="p">)</span> </span><span id="preprocess-412"><a href="#preprocess-412"><span class="linenos">412</span></a> -</span><span id="preprocess-413"><a href="#preprocess-413"><span class="linenos">413</span></a> <span class="c1"># Ensures we don't enter an infinite loop. This can happen when the original expression</span> -</span><span id="preprocess-414"><a href="#preprocess-414"><span class="linenos">414</span></a> <span class="c1"># has the same type as the final expression and there's no _sql method available for it,</span> -</span><span id="preprocess-415"><a href="#preprocess-415"><span class="linenos">415</span></a> <span class="c1"># because then it'd re-enter _to_sql.</span> -</span><span id="preprocess-416"><a href="#preprocess-416"><span class="linenos">416</span></a> <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span> -</span><span id="preprocess-417"><a href="#preprocess-417"><span class="linenos">417</span></a> <span class="sa">f</span><span class="s2">"Expression type </span><span class="si">{</span><span class="n">expression</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span><span class="si">}</span><span class="s2"> requires a _sql method in order to be transformed."</span> -</span><span id="preprocess-418"><a href="#preprocess-418"><span class="linenos">418</span></a> <span class="p">)</span> -</span><span id="preprocess-419"><a href="#preprocess-419"><span class="linenos">419</span></a> -</span><span id="preprocess-420"><a href="#preprocess-420"><span class="linenos">420</span></a> <span class="k">return</span> <span class="n">transforms_handler</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="p">)</span> -</span><span id="preprocess-421"><a href="#preprocess-421"><span class="linenos">421</span></a> -</span><span id="preprocess-422"><a href="#preprocess-422"><span class="linenos">422</span></a> <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="sa">f</span><span class="s2">"Unsupported expression type </span><span class="si">{</span><span class="n">expression</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span><span class="si">}</span><span class="s2">."</span><span class="p">)</span> -</span><span id="preprocess-423"><a href="#preprocess-423"><span class="linenos">423</span></a> -</span><span id="preprocess-424"><a href="#preprocess-424"><span class="linenos">424</span></a> <span class="k">return</span> <span class="n">_to_sql</span> +</span><span id="preprocess-413"><a href="#preprocess-413"><span class="linenos">413</span></a> <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="sa">f</span><span class="s2">"Unsupported expression type </span><span class="si">{</span><span class="n">expression</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span><span class="si">}</span><span class="s2">."</span><span class="p">)</span> +</span><span id="preprocess-414"><a href="#preprocess-414"><span class="linenos">414</span></a> +</span><span id="preprocess-415"><a href="#preprocess-415"><span class="linenos">415</span></a> <span class="k">return</span> <span class="n">_to_sql</span> </span></pre></div> |