Re: WIP: generalized index constraints

Jeff Davis <pgsql@j-davis.com> writes:
> On Tue, 2009-09-15 at 13:16 -0400, Robert Haas wrote:
>> Uhh.... so what happens if I create an index constraint using the
>> +(integer, integer) operator?

> You can use any operator that has an index search strategy. Overlaps is
> probably the most useful, but you could imagine other operators, like a
> bi-directional containment operator (either LHS is contained in RHS, or
> vice-versa).

Does it behave sanely for operators that are non-commutative, such
as '>'?  (I'm not even very sure that I know what "sanely" would be
in such a case.)
        regards, tom lane