Mike, seems to me that you're confusing union with intersection. A union
between valid polygons (including multipolygons) will always return a
polygon or multipolygon.

On Sunday, April 13, 2014, Mike Toews <mwto...@gmail.com> wrote:

> On 13 April 2014 16:56, Juan Pablo Caram <jpca...@gmail.com <javascript:;>>
> wrote:
> > Hi,
> > Is this at all possible? The GeometryCollection has a LineString!
>
> Sure, this is possible. A union can return any type of geometry, from
> GEOMETRYCOLLECTION EMPTY to POINT to anything else. If the result is a
> LINESTRING, then the union of the two geometries share a boundary. If
> it is in a GEOMETRYCOLLECTION, then there is a mixture of types in the
> same result, such as POINT and POLYGON parts. All these are possible,
> and not so strange when you look at them drawn out.
>
> -Mike
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