On Fri, Feb 19, 2010 at 11:05 PM, Robert Haas <robertmhaas@gmail.com> wrote:
> I don't think it's a stretch to say that I'm the one who is confused.
> I am under the (perhaps faulty) impression that when evaluating an
> expression there can only ever be three tuples in score: inner, outer,
s/score/scope.
> and scan. So when we go to evaluate the expression whose result will
> be assigned to $0, where do we get those inner and/or outer and/or
> scan tuples from? IOW, I understand where the subplan is putting its
> OUTPUT, what I don't understand is what context is being used to set
> its input parameters.
...Robert