[HACKERS] Re: FWD: tinterval vs interval on pgsql-novice

[Tom Lane]

Thomas Lockhart <[EMAIL PROTECTED]> writes:
>   select ('today', interval '1 day') OVERLAPS ('yesterday', interval '18
> hours');

> (the second one fails). Now that I look, this breakage was introduced in
> March when "we" expunged operators allowed as identifiers (Tom Lane and
> I have blood on our hands on this one ;) See gram.y around line 5409.

I see it does fail, but I'm at a complete loss to understand why,
especially given that the first case still works.  The grammar looks
perfectly fine AFAICT.  Can you explain what's wrong here?

                        regards, tom lane