On 13 April 2014 16:56, Juan Pablo Caram <jpca...@gmail.com> 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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