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From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Martijn van Oosterhout <kleptog(at)svana(dot)org>
Cc: andrew(at)supernews(dot)com, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Removing SORTFUNC_LT/REVLT
Date: 2006-01-01 17:56:11
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
Martijn van Oosterhout <kleptog(at)svana(dot)org> writes:
> On Thu, Dec 29, 2005 at 04:33:32PM -0000, Andrew - Supernews wrote:
>> Does it matter? How would the same operator specify different orderings
>> in different operator classes,

> Well, we currently don't forbid it and indeed encourage it (by
> encouraging reverse operator classes) as the only way to handle the
> ORDER a, b DESC case right now.
> I don't think I can find any other examples right now. I don't think
> I'd have a problem with forbidding it at some future date.

Right, the reverse-sort opclass is the only practical example that
anyone's pointed out ... for btree.  For GiST it would be a serious
error to try to restrict operators to appear in at most one opclass.
Therefore, we're not going to be forbidding it, and the code has to
behave in a sane fashion if someone does it.

			regards, tom lane

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