Martijn van Oosterhout <kleptog@svana.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 ---------------------------(end of broadcast)--------------------------- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq