Обсуждение: RE: [HACKERS] Just another question

But scan.l returns Op.

Michael

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> -----Original Message-----
> From:    Thomas G. Lockhart [SMTP:lockhart@alumni.caltech.edu]
> Sent:    Thursday, April 23, 1998 2:07 PM
> To:    Michael Meskes
> Cc:    PostgreSQL Hacker
> Subject:    Re: [HACKERS] Just another question
>
> > I just noticed that there is an operator '=:'. What is it used for?
>
> tgl=> select * from pg_operator where oprname = '=:';
> ...
> (0 rows)
>
> ?? I don't see it here.
>
>                       - Tom

> > > I just noticed that there is an operator '=:'. What is it used
> > > for?
> > ?? I don't see it here.
> But scan.l returns Op.

Oh, it is an _allowed_ operator symbol combination, if someone were to
define an operator using it. But it isn't pre-defined anywhere, is it?

And, it should be OK to require spaces to help delimit your embedded
stuff; that is, "=:" is interpreted as a possible operator, while "= :"
(with space) is "equals embedded variable"...

I'd hate to keep removing single characters from the allowed operator
character set when we get syntax conflicts like this. We'll end up with
only the SQL92-allowed operator symbols before long :)

                      - Tom