pgsql-server/src/backend/optimizer/path indxpath.c

CVSROOT:    /cvsroot
Module name:    pgsql-server
Changes by:    tgl@svr1.postgresql.org    04/01/07 18:02:48

Modified files:
    src/backend/optimizer/path: indxpath.c

Log message:
    Make some improvements in the intelligence of the partial-index
    predicate tester.  It can now deal with commuted clauses (for
    instance, 4 < x implies x > 3), subclauses more complicated than
    a simple Var (for example, upper(x) = 't' implies upper(x) > 'a'),
    and <> operators (for example, x < 3 implies x <> 4).  Still
    only understands operators associated with btree opclasses, though.
    Inspired by example from Martin Hampl.