Re: Premature view materialization in 8.2?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Jonathan Ellis" <jonathan(at)utahpython(dot)org>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Premature view materialization in 8.2?
Date: 2007-04-06 06:23:56
Message-ID: 261.1175840636@sss.pgh.pa.us
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"Jonathan Ellis" <jonathan(at)utahpython(dot)org> writes:
> On 4/5/07, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>>> Is this a regression, or a "feature" of 8.2?
>>
>> Hard to say without EXPLAIN ANALYZE output to compare.

> To my eye they are identical other than the speed but perhaps I am
> missing something.

Yeah, it sure is the same plan, and 8.2 seems to be a tad faster right
up to the hash join on user_id. Is user_id a textual datatype? I'm
wondering if the 8.2 installation is using a different locale --- the
speed of simple string comparisons can be horrifically worse in some
locales compared to others.

regards, tom lane

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