On Sat, 22 Mar 2003, Tom Lane wrote:
> Joe Conway <mail@joeconway.com> writes:
> > Pretty handy! But I couldn't find it documented anywhere -- is it?
>
> I think Thomas did that in one of his last batches of changes, and then
> disappeared without adding the documentation. Feel free to contribute
> some.
>
> I believe it is supposed to be a SQL99 feature, so you might see if the
> spec sheds any light ...
8.14 <type predicate> to be exact.
Gavin
