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From: Tom Lane <[email protected]>
To: Florian Wunderlich <[email protected]>
Cc: [email protected]
Cc: [email protected]
Subject: Re: Bug #866 related problem (ATTN Tom Lane)
Date: Wed, 12 Feb 2003 18:27:01 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

Florian Wunderlich <[email protected]> writes:
> So can I be sure that every non-aggregate SELECT on tables joined with
> unique indexes works, independent of the WHERE or ORDER BY?

I would think that backwards scan on a join mostly doesn't work, but
haven't tried it in any detail.

A plan with a SORT node at the top *will* work, no matter what's under
the SORT, so ORDER BY might mask problems in some cases.

> Is anybody working on implementing this functionality?

Not me... although I have thought about at least adding enough code to
report an error in the cases that will give wrong answers.

			regards, tom lane

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