Doesn't seem super important to back-port. To the extent that it's extant behaviour, I think we should just Let It Be.
P > On Oct 4, 2021, at 3:43 PM, Sandro Santilli <s...@kbt.io> wrote: > > I pushed a commit to main branch always returning false. > > Same on the PostGIS side, but I don't know up to which version I > should backport that. If you have old versions around, could you > please leave a comment in https://trac.osgeo.org/postgis/ticket/5008 ? > > --strk; > > On Mon, Oct 04, 2021 at 07:56:34PM +0300, Darafei "Komяpa" Praliaskouski > wrote: >> Points on infinite distance are still on the extended R2+ plane. The empty >> points aren't. >> >> This one should be "always false", and make sure that "POINT(INF INF)" is >> at INF distance from anything (can be true). POINT(Inf Inf) != POINT(NaN >> NaN) in this aspect. >> >> On Mon, Oct 4, 2021 at 6:50 PM Paul Ramsey <pram...@cleverelephant.ca> >> wrote: >> >>> https://trac.osgeo.org/postgis/wiki/DevWikiEmptyGeometry >>> >>> >>> pramsey=# select st_distance('POINT(1 1)','POINT EMPTY'); >>> st_distance >>> ------------- >>> >>> (1 row) >>> >>> Interesting note in the wiki about returning NULL for DWithin. >>> >>> Current behaviour. >>> >>> pramsey=# select st_dwithin('POINT(1 1)','POINT EMPTY', 1); >>> st_dwithin >>> ------------ >>> f >>> (1 row) >>> >>> pramsey=# select st_dwithin('POINT(1 1)','POINT EMPTY', 'Inf'::float8); >>> st_dwithin >>> ------------ >>> t >>> (1 row) >>> >>> I could see going for "always false" since we're almost there for non-inf >>> values. >>> >>> P >>> >>>> On Oct 4, 2021, at 8:08 AM, Sandro Santilli <s...@kbt.io> wrote: >>>> >>>> On Mon, Oct 04, 2021 at 05:02:24PM +0200, Sandro Santilli wrote: >>>>> I'd think yes, honestly, but the current code returns TRUE sometimes, >>>>> particularly for MAXDISTANCE being Infinite... >>>>> >>>>> As I think GEOS is not being used by phylosophers, I can't find any >>>>> reason why would anyone want a TRUE result from a DistanceWithin() >>>>> query involving an EMPTY geometry. >>>> >>>> We have the same issue on PostGIS: >>>> https://trac.osgeo.org/postgis/ticket/5008 >>>> >>>> --strk; >>>> _______________________________________________ >>>> geos-devel mailing list >>>> geos-devel@lists.osgeo.org >>>> https://lists.osgeo.org/mailman/listinfo/geos-devel >>> >>> _______________________________________________ >>> geos-devel mailing list >>> geos-devel@lists.osgeo.org >>> https://lists.osgeo.org/mailman/listinfo/geos-devel >>> > >> _______________________________________________ >> geos-devel mailing list >> geos-devel@lists.osgeo.org >> https://lists.osgeo.org/mailman/listinfo/geos-devel > > > -- > > Libre GIS consultant/developer > https://strk.kbt.io/services.html > _______________________________________________ > geos-devel mailing list > geos-devel@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/geos-devel _______________________________________________ geos-devel mailing list geos-devel@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/geos-devel
