On Tue, 2009-11-03 at 00:25 +0100, Viktor Rosenfeld wrote:
> I'd like to know what kind of functions I have to implement for a R-Tree
> index on numeric columns,
NUMERIC is scalar, so an R-Tree doesn't make much sense. You can install
btree_gist (a contrib module) to be able to use numeric columns as part
of a GiST index.
If you have more complex spatial data, you should look into PostGIS.
Regards,
Jeff Davis