Re: BUG #5165: Poor performance with Left-join where right side does not exist - Mailing list pgsql-bugs

From assaf lehr
Subject Re: BUG #5165: Poor performance with Left-join where right side does not exist
Date
Msg-id 228785.60021.qm@web53701.mail.re2.yahoo.com
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In response to Re: BUG #5165: Poor performance with Left-join where right side does not exist  (Tom Lane <tgl@sss.pgh.pa.us>)
List pgsql-bugs
ok. thanks, when my project will move to 8.4, I `ll re-do this test.




________________________________
From: Tom Lane <tgl@sss.pgh.pa.us>
To: Kevin Grittner <Kevin.Grittner@wicourts.gov>
Cc: Robert Haas <robertmhaas@gmail.com>; assaf lehr <assaf_lehr@yahoo.com>; pgsql-bugs@postgresql.org
Sent: Thu, November 5, 2009 5:21:28 PM
Subject: Re: [BUGS] BUG #5165: Poor performance with Left-join where right side does not exist

"Kevin Grittner" <Kevin.Grittner@wicourts.gov> writes:
> assaf lehr <assaf_lehr@yahoo.com> wrote:
>> let me explain it better.
>> [hand-waving and pseudo-code]

> People would like to help you, but you're not providing enough
> information to let them.

Well, the really important point is that this query is using a
construction that was specifically improved in 8.4.  The advice
is still going to be the same: see if it isn't better with 8.4.

            regards, tom lane

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