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From: Martijn van Oosterhout <kleptog(at)svana(dot)org>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Removing SORTFUNC_LT/REVLT
Date: 2005-12-30 15:07:25
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On Thu, Dec 29, 2005 at 10:49:23AM -0500, Tom Lane wrote:
> What I'd really like is to deprecate the "USING operator" syntax in
> favor of a "USING operatorclassname" syntax.  Actually, "USING opclass
> [ASC/DESC]" would get the job done, since given an opclass you can
> certainly run the sort function either normal or reverse.

Thought of something this morning: this seems OK at first glance but I
don't think it's workable. The example being locale dependant sorting.
I really don't think we want to create a new operator class for each
possible way you can sort strings.

Collations (currently anyway) are really just an operator class +
[ASC/DESC] + optional locale rolled into a single identifier. The idea
being that when you use '<', the collation on that node decides
unambiguously which version of '<' you mean, rather than looking up the
operator and trying to guess which operator class you meant.

Have a nice day,
Martijn van Oosterhout   <kleptog(at)svana(dot)org>
> Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a
> tool for doing 5% of the work and then sitting around waiting for someone
> else to do the other 95% so you can sue them.

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Subject: Re: Removing SORTFUNC_LT/REVLT
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