[postgis-devel] MultiPoint weirdness

[strk at refractions.net]

mm... 'MULTIPOINT(0 0)'::geometry also doens't work.
I've found out this is due to the GEOMETRYCOLLECTION(EMPTY)
support I've added recently (so should not be in RC1).

What do you think about dropping all EMPTY geoms except
GEOMETRYCOLLECTION ? It would simplify the code and the usage
of it. Canonical empty output is:

	GEOMETRYCOLLECTION EMPTY

Accepted inputs would be:

	GEOMETRYCOLLECTION EMPTY
	GEOMETRYCOLLECTION(EMPTY)

--strk;

On Mon, Jan 17, 2005 at 05:45:38PM +0100, Markus Schaber wrote:
> Hi,
> 
> Another weirdness:
> 
> lwgeom=# select asewkt(geomunion('POINT(10 10 10)','POINT(20 20 20)'));
>             asewkt
> -------------------------------
>  MULTIPOINT(10 10 10,20 20 20)
> (1 Zeile)
> 
> lwgeom=# select isvalid(geomunion('POINT(10 10 10)','POINT(20 20 20)'));
>  isvalid
> ---------
>  t
> (1 Zeile)
> 
> lwgeom=# select geometryFromText('MULTIPOINT(10 10 10,20 20 20)',-1);
> ERROR:  parse error - invalid geometry
> 
> lwgeom=# select geometryFromText(asewkt(geomunion('POINT(10 10
> 10)','POINT(20 20 20)')),-1);
> ERROR:  parse error - invalid geometry
> 
> So the lwgeom parser does not accept a valid geometry it created itsself.
> 
> For comparison:
> 
> The old 0.8 version creates a strange result, but accepts the result again:
> hwgeom=# select geomunion('POINT(10 10 10)','POINT(20 20 20)');
>                      geomunion
> ---------------------------------------------------
>  SRID=-1;MULTIPOINT(10 10 1.7e-308,20 20 1.7e-308)
> (1 Zeile)
> 
> hwgeom=# select 'SRID=-1;MULTIPOINT(10 10 1.7e-308,20 20
> 1.7e-308)'::geometry;
>                      geometry
> ---------------------------------------------------
>  SRID=-1;MULTIPOINT(10 10 1.7e-308,20 20 1.7e-308)
> (1 Zeile)
> 
> [Sorry, but I don't currently have a 0.9 installation working to compare
> against, but I'm working on it :-)]
> 
> Thanks,
> markus
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