On Mon, Nov 2, 2009 at 4:41 PM, Jeff Davis <pgsql@xxxxxxxxxxx> wrote: > 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. It sounds like what you're trying to do needs an "expression index" so you can construct a data type which does support gist indexes out of your two numeric columns. You could do something like create index i on (point(col1,col2)) though I think you might have to actually make a "box" instead. Alternatively you could look at the "cube" contrib module. As far as i know all of these actually work with doubles though, so you'll lose precision. -- greg -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
