[postgis-devel] Re: Btree semantic (was: [postgis-users] Strange behaviour of = operator)

Paul Ramsey pramsey at refractions.net
Thu Feb 9 19:29:04 PST 2006


Still not clear.  The current semantic is bbox == bbox.  What is the  
proposed one?

On Feb 9, 2006, at 9:40 AM, strk at refractions.net wrote:

> On Thu, Feb 09, 2006 at 08:49:13AM -0800, Paul Ramsey wrote:
>> Sorry, I missed what the semantic is.  Is it geometries with
>> identical vertex lists and vertex orders are equal?  Or is
>> directionality ignored?  Or is geometric equivalence considered
>> ( LINESTRING(0 0, 5 5) == LINESTRING(0 0, 3 3, 5 5) )?
>>
>> For ordering, I can't think of an obviously useful system. Order on
>> minx(bbox())?
>
> Current semantic is equality is bbox equality and order
> is minx,miny (or similar)
>
> --strk;




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