[postgis-users] Equality operator for type box2d

[Kuien Liu]

I'm not sure I understand what your query really looks like, but I can run
query below.

gis=# SELECT ST_GeometryType(ST_Extent(the_geom))='ST_Polygon' FROM test
WHERE num < 10;
 ?column?
----------
 true
(1 row)

where the table 'test' contains 50,000 points.

Wish this helps to you.

Cheers,
Kuien Liu

On Tue, Apr 21, 2015 at 4:58 PM, Nick Ves <vesnikos at gmail.com> wrote:

> I was playing with the ST_Extent today and I wanted to try a query like
> this:
>
> select distinct ST_Extent(geom)  over () box from parcels_test
>
> where the geom is Type ST_Polygon but I got this error instead:
>
>   ERROR:  could not identify an equality operator for type box2d
>
> The aim was to get the BBox from a set of polygons that might or might
> not be adjutant. Ofc you can get the same results by limit the result
> to 1 but, it hitted me strange box2d type not having an equal operator
>
> using "POSTGIS="2.1.4 r12966" GEOS="3.4.2-CAPI-1.8.2 r3921" PROJ="Rel.
> 4.8.0, 6 March 2012" GDAL="GDAL 1.11.1, released 2014/09/24"
> LIBXML="2.9.1" LIBJSON="UNKNOWN" RASTER"
> _______________________________________________
> postgis-users mailing list
> postgis-users at lists.osgeo.org
> http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/postgis-users/attachments/20150421/1886350e/attachment.html>