Ah yes thank you for clearing that up. The = Operator is valid for those type.
Strange thing is that box2d type DOES support the = Operator while st_box2d does not. A quick search in gis.SE forums gives a post [0] from a user stating that st_box2d is deprecated? Is that the case? [0] http://gis.stackexchange.com/questions/56818/st-box2d-in-postgis-2-0 On Tue, Apr 21, 2015 at 1:24 PM, Kuien Liu <[email protected]> wrote: > thanks, got it. Surely you may meet this issue, distinct cannot find the > 'OPERATOR =' for data type 'box2d'. > > PostGIS only supports 3 kinds of OPERATOR =, i.e., > > OPERATOR = (geometry,geometry) > OPERATOR = (geography,geography) > OPERATOR = (raster,raster) > > Maybe we can try these ways: > > cast box2d to geometry: select distinct st_extent(the_geom)::geometry from > test; > create ordering operator for box2d. > > > Cheers, > Kuien Liu > > On Tue, Apr 21, 2015 at 6:06 PM, Nick Ves <[email protected]> wrote: >> >> On Tue, Apr 21, 2015 at 12:50 PM, Kuien Liu <[email protected]> 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 <[email protected]> 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 >> >> [email protected] >> >> http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users >> > >> > >> > >> > _______________________________________________ >> > postgis-users mailing list >> > [email protected] >> > http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users >> _______________________________________________ >> postgis-users mailing list >> [email protected] >> http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users > > > > _______________________________________________ > postgis-users mailing list > [email protected] > http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users _______________________________________________ postgis-users mailing list [email protected] http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
