Re: Join push-down support for foreign tables

> > * Bug reported by Thom Brown
> > -----------------------------
> > # EXPLAIN VERBOSE SELECT NULL FROM (SELECT people.id FROM people INNER JOIN
> countries ON people.country_id = countries.id LIMIT 3) x;
> > ERROR:  could not open relation with OID 0
> >
> > Sorry, it was a problem caused by my portion. The patched setrefs.c
> > checks fdw_/custom_ps_tlist to determine whether Foreign/CustomScan
> > node is associated with a certain base relation. If *_ps_tlist is
> > valid, it also expects scanrelid == 0.
> > However, things we should check is incorrect. We may have a case
> > with empty *_ps_tlist if remote join expects no columns.
> > So, I adjusted the condition to check scanrelid instead.
> 
> Is this issue fixed by v5 custom/foreign join patch?
>
Yes, please rebase it.

--
NEC OSS Promotion Center / PG-Strom Project
KaiGai Kohei <kaigai@ak.jp.nec.com>