Re: postgres_fdw join pushdown (was Re: Custom/Foreign-Join-APIs)

       If so, my concern is, the helper function probably wouldn't
    extend to the parameterized-foreign-join-path cases, though that
    would work well for the unparameterized-foreign-join-path cases.  We
    don't support parameterized-foreign-join paths for 9.6?

If we do not find a local path with given parameterization, it means
there are other local parameterized paths which are superior to it. This
possibly indicates that there will be foreign join parameterised paths
which are superior to this parameterized path, so we basically do not
create foreign join path with that parameterization.

The latest version of the postgres_fdw join pushdown patch will support only the unparameterized-path case, so we don't have to consider this, but why do you think the superiority of parameterizations is preserved between remote joining and local joining?