Robert Creager <Robert_Creager(at)LogicalChaos(dot)org> writes:
> Is there anything I might be able to do (without the test case) that
> would help figure out what's happening?
oprofile stats would be enlightening, perhaps.
I'm particularly interested in why 7.4 is behaving better than newer
versions --- that does not compute ;-). Have you checked that the same
query plan is being used by 7.4 and the newer versions? Could you get
oprofile results for both versions?
regards, tom lane