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

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
Subject: Re: BUG #5165: Poor performance with Left-join where right side does not exist
Date: 2009-11-05 15:21:28
Message-ID: 20626.1257434488@sss.pgh.pa.us
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"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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