Robert Haas <> 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?

                        regards, tom lane

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