Re: small exclusion constraints patch

On Sat, May 29, 2010 at 06:11:57PM -0400, Tom Lane wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> > The only disadvantage I see of just documenting this is that
> > someone might write a user-defined index opclass that works like
> > this, and they won't be able to use this until at least 9.1 (or at
> > least, not without patching the source).
>
> I don't actually think that anyone's very likely to write a <>-like
> index operator. It's approximately useless to use an index for such
> a query.
>
> Or, to put it differently: if nobody's done that in the past twenty
> years, why is it likely to happen before 9.1?

Because there's a fundamentally new way to use them now, namely with
exclusion constraints :)

Cheers,
David.
--
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