| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: explain and PARAM_EXEC |
| Date: | 2010-02-20 04:10:49 |
| Message-ID: | 603c8f071002192010l22ff1cd3x801ad176b8f3fa4d@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Feb 19, 2010 at 11:05 PM, Robert Haas <robertmhaas(at)gmail(dot)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
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