[postgis-devel] chunked GeomUnion commit

[strk at refractions.net]

I've committed the chunked implementation of unite_garray
in the head branch.

This one is the version that doesn't require dump/reload
so will still get full geometry set in input, but will
chunk it before passing to GEOS for processing.

I don't feel comfortable breaking the scripts interface
so far. Please make your tests with this setup.

You can fine-tune chunk size changing the MAXGEOMSPOINTS
#define around line 267

--strk;