<note><para>ST_Collect and ST_Union are often interchangeable.
ST_Union is in general orders of magnitude slower than ST_Collect
- because it does not tries to dissolve boundaries and reorder geometries to ensure that a constructed MultiPolygon doesn't
- have intersecting regions. .</para></note>
+ because it tries to dissolve boundaries and reorder geometries to ensure that a constructed Multi* doesn't
+ have intersecting regions.</para></note>
<para>Performed by the GEOS module.</para>
<para>NOTE: this function was formerly called GeomUnion(), which