On Fri, 8 Oct 2004, Tom Lane wrote:
> Josh Berkus <josh@agliodbs.com> writes:
> > I'll give you an example why not:
>
> > CALL some_sp ( user IS 19, session IS NULL );
>
> > However, Tom, couldn't AS confuse the parser when used to call a named
> > function in a SELECT clause?
>
> I don't think so. We are talking about
>
> SELECT f(42 AS a, col1 AS b) AS collabel FROM ...
>
> Certainly there's no ambiguity to a person in this: param name AS's are
> inside parens, collabel AS's are not. I believe that bison would deal
> with this handily ... but I have to admit I've not actually tried to
> make the grammar changes for it.
A quick hack on bison confirms that this doesn't generate any conflicts
(as long as you don't add a_expr AS a_expr to a_expr :-)).
Gavin