From: Tom Lane <tgl@sss.pgh.pa.us>
To: Greg Sabino Mullane <greg@turnstep.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: SQL Challenge: Arbitrary Cross-tab
Date: Wed, 18 Aug 2004 11:13:35 -0400
Message-ID: <22765.1092842015@sss.pgh.pa.us> (raw)
In-Reply-To: <4229381dfaf8f3ae1e4cb0ae62d6f012@biglumber.com>
References: <4229381dfaf8f3ae1e4cb0ae62d6f012@biglumber.com>
"Greg Sabino Mullane" <greg@turnstep.com> writes:
>> Don't you miss for each subselect an order by tid ?
> No: since all the SELECTs are part of one statement, they
> will have the same (pseudo-random) implicit order.
Nope; Gaetano's right, you cannot assume that. It's entirely possible
for the planner to choose different plans depending on the OFFSET.
(Maybe not very likely, with such small offsets, but could happen.)
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, greg@turnstep.com
Subject: Re: SQL Challenge: Arbitrary Cross-tab
In-Reply-To: <22765.1092842015@sss.pgh.pa.us>
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