I wrote:
> Thanks. After digging through it a bit, I understand what's happening,
> but I'm not seeing any simple fix.
I forgot to mention that although I could reproduce your bad plan in
8.1, CVS HEAD doesn't fall into the trap. I don't believe we've done
anything to fix the fundamental problem however --- it may just be a
side effect of the changes in the indexscan cost model that cause it
to not go for the bogus plan.
regards, tom lane
