On 2015/11/04 17:28, Kouhei Kaigai wrote:
I think we need to consider a general solution that can be applied not
only to the case where the component tables in a foreign join all use
ROW_MARK_COPY but to the case where those tables use different rowmark
types such as ROW_MARK_COPY and ROW_MARK_EXCLUSIVE, as I pointed out

In mixture case, FDW/CSP can choose local recheck & reconstruction based
on the EPQ tuples of base relation. Nobody enforce FDW/CSP to return
a joined tuple always even if author don't want to support the feature.
Why do you think it is not a generic solution? FDW/CSP driver "can choose"
the best solution according to its implementation and capability.

It looked to me that you were discussing only the case where component foreign tables in a foreign join all use ROW_MARK_COPY, so I commented that. Sorry for my misunderstanding.

Best regards,
Etsuro Fujita

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