On Tue, Dec 01, 2015 at 11:05:47AM -0500, Robert Haas wrote:
> On Mon, Nov 30, 2015 at 2:43 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> > * Foreign join pushdown vs EvalPlanQual
> >
> > Is this fixed by 5fc4c26db? If not, what remains to do?
>
> Unfortunately, no. That commit allows FDWs to do proper EPQ handling
> for plain table scans, but it proves to be inadequate for EPQ handling
> for joins. Solving that problem will require another patch, and,
> modulo a bunch of cosmetic issues, I'm reasonably happy with KaiGai
> Kohei's latest submission. I'll respond in more detail on that
> thread, but the question I want to raise here is: do we want to
> back-patch those changes to 9.5 at this late date?
Yes. If 9.5 added a bad interface, better to fix the interface even now than
to live with the bad one.