[postgis-devel] Is errorIfGeometryCollection necessary for relate ops?

[Sandro Santilli]

On Fri, Apr 10, 2015 at 11:55:08AM +1200, Mike Toews wrote:

> so I'm wondering what is stopping PostGIS from supporting relate
> operations with geometry collections?

JTS explicitly refuses to compute the intersection matrix between
geometries if one of them is a collection:

http://sourceforge.net/p/jts-topo-suite/code/HEAD/tree/tags/Version_1.13/jts/java/src/com/vividsolutions/jts/geom/Geometry.java#l1032

I'm not sure why, nor why GEOS doesn't follow it:
https://github.com/libgeos/libgeos/blob/3.4.2/src/geom/Geometry.cpp#L443-L448

Maybe Martin can shed a light here ?

--strk;