point <-> polygon not supported? - Mailing list pgsql-sql

I’m using version 7.3.2. I got the following error when I executed the sql statement in psql:

llogicdb=> select ID, POINAME, ADDRESS, (GEOM::point <-> polygon('((-122.406903

, 37.785768),(-122.405903, 37.785768),(-122.405903, 37.786768),(-122.406903, 37

.786768))')) * 87878.15460046429 as CFF_DISTANCE from NT_SF_POI where (FACILITY

TYPE='3578') and (GEOM::point <-> polygon('((-122.406903, 37.785768),(-122.4059

03, 37.785768),(-122.405903, 37.786768),(-122.406903, 37.786768))')) * 87878.15

460046429 <= 3.41381770434236E-5 order by CFF_DISTANCE;

ERROR:  Unable to identify an operator '<->' for types 'point' and 'polygon'

        You will have to retype this query using an explicit cast

Does this mean that the <-> operator does not support distance between a point and a simple polygon?

Scott Ding