Returns the the smallest rectangle which contains the specified geometries.
 

1 geo.aggrMbr

<geo.aggrMbr>
    <geometry_column /> *
</geo.aggrMbr>
Example
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<select>
    <columns>
       <geo.aggrMbr>a.type, a.geometry_col</geo.aggrMbr>
    </columns>
    <from table='buildings' alias='a' >
    </from>
    <group>a.type</group>
</select>