[postgis-users] Equality operator for type box2d

[Nick Ves]

On Tue, Apr 21, 2015 at 12:50 PM, Kuien Liu <kliu at pivotal.io> wrote:
> I'm not sure I understand what your query really looks like, but I can run
> query below.

try this one:

select distinct st_extent(the_geom) over () from test;


> 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"
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>
>
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