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+ </a> +</div> + </nav> + <main class="pdoc"> + <section class="module-info"> + <a class="pdoc-button git-button" href="https://github.com/tobymao/sqlglot/tree/main/sqlglot/optimizer/expand_laterals.py">Edit on GitHub</a> + <h1 class="modulename"> +<a href="./../../sqlglot.html">sqlglot</a><wbr>.<a href="./../optimizer.html">optimizer</a><wbr>.expand_laterals </h1> + + + <input id="mod-expand_laterals-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1"> + + <label class="view-source-button" for="mod-expand_laterals-view-source"><span>View Source</span></label> + + <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">__future__</span> <span class="kn">import</span> <span class="n">annotations</span> +</span><span id="L-2"><a href="#L-2"><span class="linenos"> 2</span></a> +</span><span id="L-3"><a href="#L-3"><span class="linenos"> 3</span></a><span class="kn">import</span> <span class="nn">typing</span> <span class="k">as</span> <span class="nn">t</span> +</span><span id="L-4"><a href="#L-4"><span class="linenos"> 4</span></a> +</span><span id="L-5"><a href="#L-5"><span class="linenos"> 5</span></a><span class="kn">from</span> <span class="nn">sqlglot</span> <span class="kn">import</span> <span class="n">exp</span> +</span><span id="L-6"><a href="#L-6"><span class="linenos"> 6</span></a> +</span><span id="L-7"><a href="#L-7"><span class="linenos"> 7</span></a> +</span><span id="L-8"><a href="#L-8"><span class="linenos"> 8</span></a><span class="k">def</span> <span class="nf">expand_laterals</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-9"><a href="#L-9"><span class="linenos"> 9</span></a><span class="w"> </span><span class="sd">"""</span> +</span><span id="L-10"><a href="#L-10"><span class="linenos">10</span></a><span class="sd"> Expand lateral column alias references.</span> +</span><span id="L-11"><a href="#L-11"><span class="linenos">11</span></a> +</span><span id="L-12"><a href="#L-12"><span class="linenos">12</span></a><span class="sd"> This assumes `qualify_columns` as already run.</span> +</span><span id="L-13"><a href="#L-13"><span class="linenos">13</span></a> +</span><span id="L-14"><a href="#L-14"><span class="linenos">14</span></a><span class="sd"> Example:</span> +</span><span id="L-15"><a href="#L-15"><span class="linenos">15</span></a><span class="sd"> >>> import sqlglot</span> +</span><span id="L-16"><a href="#L-16"><span class="linenos">16</span></a><span class="sd"> >>> sql = "SELECT x.a + 1 AS b, b + 1 AS c FROM x"</span> +</span><span id="L-17"><a href="#L-17"><span class="linenos">17</span></a><span class="sd"> >>> expression = sqlglot.parse_one(sql)</span> +</span><span id="L-18"><a href="#L-18"><span class="linenos">18</span></a><span class="sd"> >>> expand_laterals(expression).sql()</span> +</span><span id="L-19"><a href="#L-19"><span class="linenos">19</span></a><span class="sd"> 'SELECT x.a + 1 AS b, x.a + 1 + 1 AS c FROM x'</span> +</span><span id="L-20"><a href="#L-20"><span class="linenos">20</span></a> +</span><span id="L-21"><a href="#L-21"><span class="linenos">21</span></a><span class="sd"> Args:</span> +</span><span id="L-22"><a href="#L-22"><span class="linenos">22</span></a><span class="sd"> expression: expression to optimize</span> +</span><span id="L-23"><a href="#L-23"><span class="linenos">23</span></a><span class="sd"> Returns:</span> +</span><span id="L-24"><a href="#L-24"><span class="linenos">24</span></a><span class="sd"> optimized expression</span> +</span><span id="L-25"><a href="#L-25"><span class="linenos">25</span></a><span class="sd"> """</span> +</span><span id="L-26"><a href="#L-26"><span class="linenos">26</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-27"><a href="#L-27"><span class="linenos">27</span></a> <span class="n">alias_to_expression</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Dict</span><span class="p">[</span><span class="nb">str</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="p">{}</span> +</span><span id="L-28"><a href="#L-28"><span class="linenos">28</span></a> <span class="k">for</span> <span class="n">projection</span> <span class="ow">in</span> <span class="n">select</span><span class="o">.</span><span class="n">expressions</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">column</span> <span class="ow">in</span> <span class="n">projection</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">):</span> +</span><span id="L-30"><a href="#L-30"><span class="linenos">30</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">column</span><span class="o">.</span><span class="n">table</span> <span class="ow">and</span> <span class="n">column</span><span class="o">.</span><span class="n">name</span> <span class="ow">in</span> <span class="n">alias_to_expression</span><span class="p">:</span> +</span><span id="L-31"><a href="#L-31"><span class="linenos">31</span></a> <span class="n">column</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">alias_to_expression</span><span class="p">[</span><span class="n">column</span><span class="o">.</span><span class="n">name</span><span class="p">]</span><span class="o">.</span><span class="n">copy</span><span class="p">())</span> +</span><span id="L-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">projection</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Alias</span><span class="p">):</span> +</span><span id="L-33"><a href="#L-33"><span class="linenos">33</span></a> <span class="n">alias_to_expression</span><span class="p">[</span><span class="n">projection</span><span class="o">.</span><span class="n">alias</span><span class="p">]</span> <span class="o">=</span> <span class="n">projection</span><span class="o">.</span><span class="n">this</span> +</span><span id="L-34"><a href="#L-34"><span class="linenos">34</span></a> <span class="k">return</span> <span class="n">expression</span> +</span></pre></div> + + + </section> + <section id="expand_laterals"> + <input id="expand_laterals-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">expand_laterals</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="expand_laterals-view-source"><span>View Source</span></label> + + </div> + <a class="headerlink" href="#expand_laterals"></a> + <div class="pdoc-code codehilite"><pre><span></span><span id="expand_laterals-9"><a href="#expand_laterals-9"><span class="linenos"> 9</span></a><span class="k">def</span> <span class="nf">expand_laterals</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="expand_laterals-10"><a href="#expand_laterals-10"><span class="linenos">10</span></a><span class="w"> </span><span class="sd">"""</span> +</span><span id="expand_laterals-11"><a href="#expand_laterals-11"><span class="linenos">11</span></a><span class="sd"> Expand lateral column alias references.</span> +</span><span id="expand_laterals-12"><a href="#expand_laterals-12"><span class="linenos">12</span></a> +</span><span id="expand_laterals-13"><a href="#expand_laterals-13"><span class="linenos">13</span></a><span class="sd"> This assumes `qualify_columns` as already run.</span> +</span><span id="expand_laterals-14"><a href="#expand_laterals-14"><span class="linenos">14</span></a> +</span><span id="expand_laterals-15"><a href="#expand_laterals-15"><span class="linenos">15</span></a><span class="sd"> Example:</span> +</span><span id="expand_laterals-16"><a href="#expand_laterals-16"><span class="linenos">16</span></a><span class="sd"> >>> import sqlglot</span> +</span><span id="expand_laterals-17"><a href="#expand_laterals-17"><span class="linenos">17</span></a><span class="sd"> >>> sql = "SELECT x.a + 1 AS b, b + 1 AS c FROM x"</span> +</span><span id="expand_laterals-18"><a href="#expand_laterals-18"><span class="linenos">18</span></a><span class="sd"> >>> expression = sqlglot.parse_one(sql)</span> +</span><span id="expand_laterals-19"><a href="#expand_laterals-19"><span class="linenos">19</span></a><span class="sd"> >>> expand_laterals(expression).sql()</span> +</span><span id="expand_laterals-20"><a href="#expand_laterals-20"><span class="linenos">20</span></a><span class="sd"> 'SELECT x.a + 1 AS b, x.a + 1 + 1 AS c FROM x'</span> +</span><span id="expand_laterals-21"><a href="#expand_laterals-21"><span class="linenos">21</span></a> +</span><span id="expand_laterals-22"><a href="#expand_laterals-22"><span class="linenos">22</span></a><span class="sd"> Args:</span> +</span><span id="expand_laterals-23"><a href="#expand_laterals-23"><span class="linenos">23</span></a><span class="sd"> expression: expression to optimize</span> +</span><span id="expand_laterals-24"><a href="#expand_laterals-24"><span class="linenos">24</span></a><span class="sd"> Returns:</span> +</span><span id="expand_laterals-25"><a href="#expand_laterals-25"><span class="linenos">25</span></a><span class="sd"> optimized expression</span> +</span><span id="expand_laterals-26"><a href="#expand_laterals-26"><span class="linenos">26</span></a><span class="sd"> """</span> +</span><span id="expand_laterals-27"><a href="#expand_laterals-27"><span class="linenos">27</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="expand_laterals-28"><a href="#expand_laterals-28"><span class="linenos">28</span></a> <span class="n">alias_to_expression</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Dict</span><span class="p">[</span><span class="nb">str</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="p">{}</span> +</span><span id="expand_laterals-29"><a href="#expand_laterals-29"><span class="linenos">29</span></a> <span class="k">for</span> <span class="n">projection</span> <span class="ow">in</span> <span class="n">select</span><span class="o">.</span><span class="n">expressions</span><span class="p">:</span> +</span><span id="expand_laterals-30"><a href="#expand_laterals-30"><span class="linenos">30</span></a> <span class="k">for</span> <span class="n">column</span> <span class="ow">in</span> <span class="n">projection</span><span class="o">.</span><span class="n">find_all</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">):</span> +</span><span id="expand_laterals-31"><a href="#expand_laterals-31"><span class="linenos">31</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">column</span><span class="o">.</span><span class="n">table</span> <span class="ow">and</span> <span class="n">column</span><span class="o">.</span><span class="n">name</span> <span class="ow">in</span> <span class="n">alias_to_expression</span><span class="p">:</span> +</span><span id="expand_laterals-32"><a href="#expand_laterals-32"><span class="linenos">32</span></a> <span class="n">column</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">alias_to_expression</span><span class="p">[</span><span class="n">column</span><span class="o">.</span><span class="n">name</span><span class="p">]</span><span class="o">.</span><span class="n">copy</span><span class="p">())</span> +</span><span id="expand_laterals-33"><a href="#expand_laterals-33"><span class="linenos">33</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">projection</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Alias</span><span class="p">):</span> +</span><span id="expand_laterals-34"><a href="#expand_laterals-34"><span class="linenos">34</span></a> <span class="n">alias_to_expression</span><span class="p">[</span><span class="n">projection</span><span class="o">.</span><span class="n">alias</span><span class="p">]</span> <span class="o">=</span> <span class="n">projection</span><span class="o">.</span><span class="n">this</span> +</span><span id="expand_laterals-35"><a href="#expand_laterals-35"><span class="linenos">35</span></a> <span class="k">return</span> <span class="n">expression</span> +</span></pre></div> + + + <div class="docstring"><p>Expand lateral column alias references.</p> + +<p>This assumes <code>qualify_columns</code> as already run.</p> + +<h6 id="example">Example:</h6> + +<blockquote> + <div class="pdoc-code codehilite"> +<pre><span></span><code><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">sqlglot</span> +<span class="gp">>>> </span><span class="n">sql</span> <span class="o">=</span> <span class="s2">"SELECT x.a + 1 AS b, b + 1 AS c FROM x"</span> +<span class="gp">>>> </span><span class="n">expression</span> <span class="o">=</span> <span class="n"><a href="../../sqlglot.html#parse_one">sqlglot.parse_one</a></span><span class="p">(</span><span class="n">sql</span><span class="p">)</span> +<span class="gp">>>> </span><span class="n">expand_laterals</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span><span class="o">.</span><span class="n">sql</span><span class="p">()</span> +<span class="go">'SELECT x.a + 1 AS b, x.a + 1 + 1 AS c FROM x'</span> +</code></pre> + </div> +</blockquote> + +<h6 id="arguments">Arguments:</h6> + +<ul> +<li><strong>expression:</strong> expression to optimize</li> +</ul> + +<h6 id="returns">Returns:</h6> + +<blockquote> + <p>optimized expression</p> +</blockquote> +</div> + + + </section> + </main> 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