Alvaro Herrera <[EMAIL PROTECTED]> writes:
> I wonder why we don't support more operators on Xid, so these things are
> avoided?  Right now we only have =, AFAIR.

I once started to make a btree opclass for XID, and stopped when it
occurred to me that XID comparison doesn't obey the transitive law.
btree won't like that...

                        regards, tom lane

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