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From: Jeff Davis <pgsql@j-davis.com>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Teodor Sigaev <teodor@sigaev.ru>
Cc: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
Cc: Pgsql Hackers <pgsql-hackers@postgresql.org>
Subject: Re: [PATCHES] GIN improvements
Date: Wed, 04 Feb 2009 13:23:09 -0800
Message-ID: <1233782589.3805.12.camel@dell.linuxdev.us.dell.com> (raw)
In-Reply-To: <603c8f070902041140h35c2aeo8c4ed79cd16400f8@mail.gmail.com>
References: <483FD205.4090904@sigaev.ru>
	<1232348905.7281.114.camel@jdavis>
	<4974B002.3040202@sigaev.ru>
	<1232474489.23316.8.camel@jdavis>
	<49770FD4.5030600@sigaev.ru>
	<1232561271.23793.46.camel@jdavis>
	<497864DC.5080800@sigaev.ru>
	<4979BAF8.1000501@sigaev.ru>
	<16080.1233625091@sss.pgh.pa.us>
	<1233772747.3805.2.camel@dell.linuxdev.us.dell.com>
	<603c8f070902041140h35c2aeo8c4ed79cd16400f8@mail.gmail.com>

On Wed, 2009-02-04 at 14:40 -0500, Robert Haas wrote:
> Well, there's nothing to force that plan to be invalidated when the
> state of the pending list changes, is there?
> 

Would it be unreasonable to invalidate cached plans during the pending
list cleanup?

Anyway, it just strikes me as strange to expect a plan to be a good plan
for very long. Can you think of an example where we applied this rule
before?

Regards,
	Jeff Davis

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