Re: PL/pgSQL PERFORM with CTE

2013/8/20 Merlin Moncure <mmoncure(at)gmail(dot)com>

> On Tue, Aug 20, 2013 at 7:25 AM, Andres Freund <andres(at)2ndquadrant(dot)com>
> wrote:
> > On 2013-08-20 14:15:55 +0200, David E. Wheeler wrote:
> >> Hi Pavel,
> >>
> >> On Aug 20, 2013, at 2:11 PM, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
> wrote:
> >>
> >> >> david=# DO $$
> >> >> david$# BEGIN
> >> >> david$# WITH now AS (SELECT now())
> >> >> david$# PERFORM * from now;
> >> >> david$# END;
> >> >> david$# $$;
> >> >> ERROR: syntax error at or near "PERFORM"
> >> >> LINE 4: PERFORM * from now;
> >> >> ^
> >> >> Parser bug in PL/pgSQL, perhaps?
> >> >
> >> > no
> >> >
> >> > you cannot use a PL/pgSQL statement inside SQL statement.
> >>
> >> Well, there ought to be *some* way to tell PL/pgSQL to discard the
> result. Right now I am adding a variable to select into but never otherwise
> use. Inelegant, IMHO. Perhaps I’m missing some other way to do it?
> >>
> >> If so, it would help if the hint suggesting the use of PERFORM pointed
> to such alternatives.
> >
> > Not that that's elegant but IIRC PERFORM (WITH ...) ought to work. I
> > don't think the intermingled plpgsql/sql grammars allow a nice way right
> > now.
>
> I think the way forward is to remove the restriction such that data
> returning queries must be PERFORM'd

I disagree, current rule has sense.

Pavel

>
> merlin
>