From: | assaf lehr <assaf_lehr(at)yahoo(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov> |
Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-bugs(at)postgresql(dot)org |
Subject: | Re: BUG #5165: Poor performance with Left-join where right side does not exist |
Date: | 2009-11-05 22:23:13 |
Message-ID: | 228785.60021.qm@web53701.mail.re2.yahoo.com |
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Thread: | |
Lists: | pgsql-bugs |
ok. thanks, when my project will move to 8.4, I `ll re-do this test.
________________________________
From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>; assaf lehr <assaf_lehr(at)yahoo(dot)com>; pgsql-bugs(at)postgresql(dot)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(dot)Grittner(at)wicourts(dot)gov> writes:
> assaf lehr <assaf_lehr(at)yahoo(dot)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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