[geos-devel] RE: GEOS errors from PostGIS

[strk]

On Mon, Jan 17, 2011 at 11:05:42AM +1030, James.Sewell at lisasoft.com wrote:
> The latest daily doesn't help the problem so I've reverted to 3.2.2 and performed some more testing.
> 
> I have a dataset where:
> 
> ST_Union(the_geom, ST_SetSRID('LINESTRING EMPTY', 4283))
> 
> Fails, yet
> 
> ST_Union(the_geom).
> 
> Works. There are other datasets which fail on both versions, and I have no doubt I can find one which works in the reverse manner.

The latter uses CascadedUnion (the one UnaryUnion uses too).
The former uses normal union (non-cascaded).

--strk;

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