ST_IsValid fails with empty polygons

[Paco Calvo]

Using PostGIS 1.5.1 on PostgreSQL 8.4.

ST_IsValid returns false for empty polygons stored from EWKB. Example:

select the_geom, st_asewkt(the_geom), st_isempty(the_geom) from table limit 1

"01030000208610000000000000";"SRID=4230;POLYGON EMPTY";f

[pramsey]

Lots of functions are going to return odd things for POLYGON EMPTY because typed empties are not really supported pre-2.0. Unless this is actually impeding real work I'd rather put this off to 2.0 where typed empties are explicitly supported.

[Paco Calvo]

This example is derived from real work, but was intended to test how PostGis 1.5 deals with empty geometries, so it doesn't impedes real work.

Thank you for your answer.