On 2015/11/24 2:41, Robert Haas wrote:
On Fri, Nov 20, 2015 at 12:11 AM, Kouhei Kaigai <kai...@ak.jp.nec.com> wrote:
One subplan means FDW driver run an entire join sub-tree with local
alternative sub-plan; that is my expectation for the majority case.

What I'm imagining is that we'd add handling that allows the
ForeignScan to have inner and outer children.  If the FDW wants to
delegate the EvalPlanQual handling to a local plan, it can use the
outer child for that.  Or the inner one, if it likes.  The other one
is available for some other purposes which we can't imagine yet.  If
this is too weird, we can only add handling for an outer subplan and
forget about having an inner subplan for now.  I just thought to make
it symmetric, since outer and inner subplans are pretty deeply baked
into the structure of the system.

I'd vote for only allowing an outer subplan.

Best regards,
Etsuro Fujita

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