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   <h1>Aggregator</h1>

 <h2 id="st_envelope_aggr">ST_Envelope_Aggr<a class="headerlink" href="#st_envelope_aggr" title="Permanent link">&para;</a></h2>
 <p>Introduction: Return the entire envelope boundary of all geometries in A</p>
 <p>Format: <code>ST_Envelope_Aggr (A:geometryColumn)</code></p>
 <p>Since: <code>v1.3.0</code></p>
 <p>SQL example:
 <div class="highlight"><pre><span></span><code><span class="k">SELECT</span><span class="w"> </span><span class="n">ST_Envelope_Aggr</span><span class="p">(</span><span class="n">pointdf</span><span class="p">.</span><span class="n">arealandmark</span><span class="p">)</span><span class="w"></span>
 <span class="k">FROM</span><span class="w"> </span><span class="n">pointdf</span><span class="w"></span>
 </code></pre></div></p>
 <h2 id="st_union_aggr">ST_Union_Aggr<a class="headerlink" href="#st_union_aggr" title="Permanent link">&para;</a></h2>
 <p>Introduction: Return the polygon union of all polygons in A. All inputs must be polygons.</p>
 <p>Format: <code>ST_Union_Aggr (A:geometryColumn)</code></p>
 <p>Since: <code>v1.3.0</code></p>
 <p>SQL example:
 <div class="highlight"><pre><span></span><code><span class="k">SELECT</span><span class="w"> </span><span class="n">ST_Union_Aggr</span><span class="p">(</span><span class="n">polygondf</span><span class="p">.</span><span class="n">polygonshape</span><span class="p">)</span><span class="w"></span>
 <span class="k">FROM</span><span class="w"> </span><span class="n">polygondf</span><span class="w"></span>
 </code></pre></div></p>

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