Re: [HACKERS] subquery syntax broken

I believe it has to do with the fact that '=' has right precedence.
Thomas, can you comment. Maybe we need to %right 'Op' at that point so
it doesn't shift too early?

>
> Bruce Momjian wrote:
> >
> > > vac=> select * from x where y = (select max(y) from x);
> > > ERROR: parser: parse error at or near "select"
> > > vac=> select * from x where y <> (select max(y) from x);
> > > ERROR: parser: parse error at or near "select"
> >
> > Sorry I missed that most obvious option. Here is the patch. I will
> > apply it today.
>
> It doesn't work for =, >, etc:
>
> vac=> select * from x where y = (select max(y) from x);
> ERROR: parser: parse error at or near "select"
>
> but work for others:
>
> vac=> select * from x where y @ (select max(y) from x);
> ERROR: There is no operator '@' for types 'int4' and 'int4'
> You will either have to retype this query using an explicit cast,
> or you will have to define the operator using CREATE OPERATOR
>
> Also:
>
> > + | a_expr Op '(' SubSelect ')'
> > + {
> > + SubLink *n = makeNode(SubLink);
> > + n->lefthand = lcons($1, NULL);
> > + n->oper = lcons($2,NIL);
> > + n->useor = false;
> > + n->subLinkType = ALL_SUBLINK;
> ^^^^^^^^^^^
> should be EXPR_SUBLINK
> > + n->subselect = $4;
> > + $$ = (Node *)n;
> > + }
>
> Vadim
>

--
Bruce Momjian
maillist(at)candle(dot)pha(dot)pa(dot)us