"David G. Johnston" <david.g.johnston@gmail.com> writes:
> Also, any reason not to just say:
> "This syntax is accepted for compatibility with the SQL standard." and
> move on?
+1. The syntax does not in fact do anything that anyone would call
useful. And I'm also unsure that it really satisfies what the
standard suggests it should do.
On the whole, leaving it in undocumented obscurity seems fine to
me. But if we must mention it, the less said the better. Nobody
will read a paragraph about this and think their time was well
spent.
regards, tom lane