From: Tom Lane <tgl@sss.pgh.pa.us>
To: Shaun Thomas <sthomas@leapfrogonline.com>
Cc: Jim C. Nasby <jnasby@pervasive.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Confirmation of bad query plan generated by 7.4
Date: Tue, 13 Jun 2006 22:13:24 -0400
Message-ID: <18843.1150251204@sss.pgh.pa.us> (raw)
In-Reply-To: <448EF8B2.8F27.00A9.0@leapfrogonline.com>
References: <9119.1150222168@sss.pgh.pa.us>
<448EDFC4.8F27.00A9.0@leapfrogonline.com>
<20060613211347.GB34196@pervasive.com>
<448EE95D.8F27.00A9.0@leapfrogonline.com>
<20060613215418.GI34196@pervasive.com>
<448EF8B2.8F27.00A9.0@leapfrogonline.com>
"Shaun Thomas" <sthomas@leapfrogonline.com> writes:
> I can see the planner not liking the results of a function,
> but a variable? That's a static value!
Read what you wrote, and rethink...
If you're desperate you can construct a query string with the variable
value embedded as a literal, and then EXECUTE that. This isn't a great
solution since it forces a re-plan on every execution. We've
occasionally debated ways to do it better, but no such improvement will
ever appear in 7.4 ;-)
regards, tom lane
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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, sthomas@leapfrogonline.com, jnasby@pervasive.com
Subject: Re: Confirmation of bad query plan generated by 7.4
In-Reply-To: <18843.1150251204@sss.pgh.pa.us>
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