Re: ERROR: PlaceHolderVar found where not expected - Mailing list pgsql-bugs

Richard Guo <guofenglinux@gmail.com> writes:
> I came across an ERROR as $subject with query below.
> ...
> This is due to that we use 0 flags for pull_var_clause in
> dependency_is_compatible_expression, assuming that the 'clause_expr'
> cannot contain Aggrefs, WindowFuncs or PlaceHolderVars.  This should be
> an oversight as we can see that it's possible to find PHVs here.

Nice catch.

> But I'm not sure if Aggrefs and WindowFuncs are possible to be found
> here.

WindowFuncs should be disallowed in qual clauses, so I think it's okay
to leave those flags out.  An Aggref could occur in a HAVING qual though.
I'm not sure if this code could get applied to HAVING ... but it's
not immediately clear that it can't.  I'd be inclined to add
PVC_RECURSE_AGGREGATES, as that seems more likely to be okay than not.

            regards, tom lane