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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andrew Dunstan <andrew@dunslane.net>
Cc: Heikki Linnakangas <hlinnakangas@vmware.com>
Cc: Craig Ringer <craig@2ndQuadrant.com>
Cc: Claudio Freire <klaussfreire@gmail.com>
Cc: Merlin Moncure <mmoncure@gmail.com>
Cc: David Greco <David_Greco@harte-hanks.com>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: Poor performance using CTE
Date: Wed, 21 Nov 2012 09:59:07 -0500
Message-ID: <3396.1353509947@sss.pgh.pa.us> (raw)
In-Reply-To: <50ACE970.7050701@dunslane.net>
References: <187F6C10D2931A4386EE8E58E13857F612917154@BLUPRD0811MB413.namprd08.prod.outlook.com>
	<CAHyXU0xeEVX2P=HaNxPiKayEhkWp3GobgAXCQPrfsqbawXVV-w@mail.gmail.com>
	<CAGTBQpZ_Za-XSXvmPUx3F7wgeX=HB1xUpDsn+1DXY3a87YJLBQ@mail.gmail.com>
	<CAHyXU0z4oUss50vhH_wGZ-HERQe9wCMSf1nMTGNddXeCoKvVVA@mail.gmail.com>
	<CAGTBQpbf9bdJ3gjcYdw2FuPmN=dqx+wE7opsCp515cEndpGDYw@mail.gmail.com>
	<50AC1472.3050607@2ndQuadrant.com>
	<18123.1353455585@sss.pgh.pa.us>
	<50ACD166.1000507@vmware.com>
	<50ACE970.7050701@dunslane.net>

Andrew Dunstan <andrew@dunslane.net> writes:
> If we're going to do it can we please come up with something more 
> intuitive and much, much more documented than "OFFSET 0"? And if/when we 
> do this we'll need to have big red warnings all over then release notes, 
> since a lot of people I know will need to do some extensive remediation 
> before moving to such a release.

The probability that we would actually *remove* that behavior of OFFSET
0 is not distinguishable from zero.  I'm not terribly excited about
having an alternate syntax to specify an optimization fence, but even
if we do create such a thing, there's no need to break the historical
usage.

			regards, tom lane




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