Etsuro Fujita <> writes:
> One thing I'm not sure about is: should we insist that a join can be  
> pushed down only if the checkAsUser fields of the relevant RTEs are  
> equal in the case where user mappings are meaningless to the FDW, like  
> file_fdw?

If we add a mechanism to let us know that the FDW doesn't care, we could
relax the requirement for such cases.  I don't have a strong opinion on
whether that's worthwhile.  It'd depend in part on how many FDWs there
are that don't care, versus those that do; and I have no idea about that.

                        regards, tom lane

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