Re: "ORDER BY" clause prevents "UPDATE WHERE CURRENT OF"

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Robert Haas" <robertmhaas(at)gmail(dot)com>
Cc: Postgres <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: "ORDER BY" clause prevents "UPDATE WHERE CURRENT OF"
Date: 2008-11-14 22:06:04
Message-ID: 21885.1226700364@sss.pgh.pa.us
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"Robert Haas" <robertmhaas(at)gmail(dot)com> writes:
> I found the following behavior surprising. Is there a reason for it?

Yes.

regards, tom lane

(Oh, you wanted to know what the reason is? It's because a sort step
is not going to pass through any tuple identity information.)

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