Neil Conway <[EMAIL PROTECTED]> writes:
> Interesting that we get the row count estimate for this index scan so
> wrong -- I believe this is the root of the problem. Hmmm... I would
> guess that the optimizer stats we have for estimating the selectivity
> of a functional index is pretty primitive, but I haven't looked into
> it at all. Tom might be able to shed some light...

Try "none at all".  I have speculated in the past that it would be worth
gathering statistics about the contents of functional indexes, but it's
still on the to-do-someday list.

>> ->  Seq Scan on traffic_logs ts  (cost=0.00..38340.72 rows=8213 width=16) (actual 
>> time=5.02..-645982.04 rows=462198 loops=1)

> Uh, what?

That is bizarre, all right.  Is it reproducible?

                        regards, tom lane

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