Re: Help with optimizing a sql statement - Mailing list pgsql-performance

From Greg Stark
Subject Re: Help with optimizing a sql statement
Date
Msg-id 87zmkz6955.fsf@stark.xeocode.com
Whole thread Raw
In response to Re: Help with optimizing a sql statement  (Tom Lane <tgl@sss.pgh.pa.us>)
List pgsql-performance
Tom Lane <tgl@sss.pgh.pa.us> writes:

> Are you sure this WHERE clause really expresses your intent?  It seems
> awfully oddly constructed.  Removing the redundant parens and clarifying
> the layout, I get
...
> That next-to-last major AND clause seems a rather unholy mix of join and
> restriction clauses; I wonder if it's not buggy in itself.

FYI RT uses a perl module called SearchBuilder which constructs these queries
dynamically. So he's probably not really free to fiddle with the query all he
wants.

At the very least I would suggest checking the changelog for SearchBuilder for
more recent versions. There have been a lot of tweaks for working with
Postgres. In the past it really only worked properly with MySQL.

--
greg

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