[postgis-devel] collect()

[strk at refractions.net]

Another issue tight to flattening.

Flattening might require a 'depth' argument

   a geometry of this type: 
	COLLECTION -+-- COLLECTION --+-- MULTIPOINT
	            |                |
	            +-- MULTIPOINT   +-- POINT
   -might become:
	MULTIPOINT

   -might become:
	COLLECTION -+-- MULTIPOINT
	            |   
	            +-- MULTIPOINT   
   -might become:
	COLLECTION -+-- MULTIPOINT

   -might become:
	COLLECTION -+-- POINT
	            |   
	            +-- POINT
	            |   
	            ...

The 'flattening' issue seems harder to manage then initially looked.

--strk;

On Mon, Sep 27, 2004 at 06:52:38PM +0200, strk at refractions.net wrote:
> On Mon, Sep 27, 2004 at 09:25:35AM -0700, Chris Hodgson wrote:
> > By flatten I suppose you mean to remove any nested collections and put 
> > them all in one big collection? Yes. We didn't have support for nested 
> > collections when "collect()" was written (that was the first thing I 
> > ever wrote for postgis!).
> > 
> > I agree, collect shouldn't flatten, but a separate function that does 
> > flatten would be a good idea.
> 
> Good.
> And bed (the LWGEOM_EXPLODED structure needs a refactoring :)
> --strk;
> 
> > 
> > Chris
> > 
> > strk at refractions.net wrote:
> > 
> > >Current (OLD) collect() function flatten geometries.
> > >Should NEW collect() also do this or instead have a
> > >flatten(the_geom) taking care of this ?
> > >(I opt for the second)
> > >--strk;
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> > > 
> > >
> > 
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