Re: [sqlsmith] Failed assertion in parallel worker (ExecInitSubPlan)

On Fri, May 13, 2016 at 9:43 AM, Amit Kapila <amit.kapila16@gmail.com> wrote:
>
> On Thu, May 12, 2016 at 11:37 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> >
> > Robert Haas <robertmhaas@gmail.com> writes:
> > >> Target list for a relation, you mean?  See relation.h:
> > >>
> > >> *      reltarget - Default Path output tlist for this rel; normally contains
> > >> *                  Var and PlaceHolderVar nodes for the values we need to
> > >> *                  output from this relation.
> > >> *                  List is in no particular order, but all rels of an
> > >> *                  appendrel set must use corresponding orders.
> > >> *                  NOTE: in an appendrel child relation, may contain
> > >> *                  arbitrary expressions pulled up from a subquery!
> >
> > > Err, wow.  That makes my head hurt.  Can you explain why this case
> > > only arises for appendrel children, and not for plain rels?
> >
> > Well, plain rels only output Vars ;-)
> >
>
> Does this mean that base rels can't contain PlaceHolderVars?  Isn't it possible in below code:
>