[postgis-devel] ST_UnaryUnion vs ST_Dump + ST_Union

Sandro Santilli strk at keybit.net
Sun Oct 2 11:06:13 PDT 2011

On Sun, Oct 02, 2011 at 08:47:13AM -0700, Paul Ramsey wrote:
> On a semi-related note, why the new function signature? Why isn't this
> just ST_Union?

Because ST_Union is an aggregate, so can't be also a normal function.
Improving ST_Union (aggregate) to finally use the geos UnaryUnion would
be a sensible next step, but as not all supported GEOS versions do have
GEOSUnaryUnion it'll take some additional ifdefs.


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