It's because the underlying JTS/GEOS operation doesn't support
GeometryCollections. And this in turn is because of the details of the
implementation - in particular, handling the situation where two
polygons overlap. It would require computing the overlay of the
polygons in order to detect the within condition at the point of overlap.
On 5/7/2012 7:52 AM, Hemin Tofiq wrote:
Hi,
The documentation about ST_Within says:
"Do not call with a GEOMETRYCOLLECTION as an argument", without saying why.
I can not finde more Info about taht, du anyone has an explanation?
http://postgis.refractions.net/docs/ST_Within.html
Thanks in advance,
Hemin
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