Re: OUTER JOIN performance regression remains in 8.3beta4

"Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov> writes:
> As I poked around at this, it started to seem familiar. I had
> previously posted about this query's performance under 8.2.4.
> http://archives.postgresql.org/pgsql-performance/2007-10/msg00087.php

Well, that thread gave some of the missing details, such as

Table "public.ControlRecord"
Column | Type | Modifiers
--------------------+------------------------+-----------
countyNo | "CountyNoT" | not null

but what the heck is "CountyNoT"?

It looks like 8.3 is failing to realize that it can propagate the
countyNo = 53 condition down to this table's scan, as 8.2 did;
but there's not enough details here to guess why not.

regards, tom lane