[postgis-devel] assumptions of &&& operator for missing dimensions

[Even Rouault]

Le mardi 24 février 2015 16:15:53, Sandro Santilli a écrit :
> On Tue, Feb 24, 2015 at 08:09:26AM -0500, Paul Ramsey wrote:
> > Well, the old semantic has been there since 2.0, which is a very long
> > time. A further question for it would be: what do the next functions do?
> > What does a distance calculation between a 2d and 3d object return? does
> > it also respect that semantic?
> 
> I just checked and ST_3DDistance is instead still confusing:
> select ST_3DDistance('POINT Z (0 0 10)', 'POINT (0 0)'); -- 10
> I think it should be 0 instead.

As an uninformed observer, 10 or an error because of heterogenous dimensions 
would seem reasonable to me. But 0 would be very surprising !

> 
> For the new <<->> and <<#>> operators I implemented the new semantic
> (https://github.com/postgis/postgis/pull/34)
> 
> --strk;
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