[postgis-users] GeomUnion Bug?

[Charlie Savage]

This makes sense to me:

SELECT astext(GeomUnion(GeomFromText('POINT(-104 40)'),
  	                GeomFromText('POINT(-105 40)')))

"MULTIPOINT(-105 40,-104 40)"



But this not so much:

SELECT astext(GeomUnion(GeomFromText('POLYGON((-104 40,-104 40,-104 

                                                  40,-104 40,-104 40))'),
                         GeomFromText('POLYGON((-105 40,-105 40,-105
                                                  40,-105 40,-105 0))')))

"GEOMETRYCOLLECTION EMPTY"

Is this a bug?  Or is it supposed work this way?  It used to be 
different with Geos 2.2.1 (I assume this is a geos issue so I included 
that mailing list).

Charlie



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