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List:       postgis-devel
Subject:    Re: [postgis-devel] OPERATOR @ (raster, geometry)
From:       Sandro Santilli <strk () keybit ! net>
Date:       2013-11-06 19:11:23
Message-ID: 20131106191123.GB5614 () cdb
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For the record, discussion continues here:
http://trac.osgeo.org/postgis/ticket/2532

--strk;

On Wed, Nov 06, 2013 at 04:59:51PM +0100, Sandro Santilli wrote:
> I've almost completed the script to create the postgis-from-unpackaged
> script and while testing it I'm discovering various possible bugs.
> 
> One of these is in the presence of an:
> 
>   OPERATOR @ (raster, geometry)
> 
> known by PostgreSQL after an install, but that is not explicitly 
> created by the rtpostis.sql script. The closer I see is this:
> 
> CREATE OPERATOR ~ (
>     LEFTARG = geometry, RIGHTARG = raster, PROCEDURE = geometry_raster_contain,
>     COMMUTATOR = '@',
>     RESTRICT = contsel, JOIN = contjoinsel
>     );
> 
> That is, operator ~ (geometry, raster) is saying that its _commutator_
> is operator @ (raster, geometry), but that operator is never explicitly
> defined. 
> 
> Was this intentional ?
> 
> The script extracts SQL objects from these "enabler" scripts, and is
> unable to deal with commutators. I could enhance the script to deal
> with them but then why are we doing it explicitly in postgis.sql ?
> 
> --strk;
> 
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