2015-05-15 8:43 GMT+09:00 Kouhei Kaigai <kaigai@ak.jp.nec.com>:
> Regarding of FDW, as Hanada-san mentioned, I'm uncertain whether
> similar feature is also needed because its join-pushdown feature
> scan on the result-set of remotely joined relations, thus no need
> to have local child Path nodes.
> So, I put this custom_children list on CustomXXXX structure only.
AFAIS most of FDWs won't need child paths to process their external data.
The most possible idea is that a FDW uses output of ForeignScan plan
node which is handled by the FDW, but such work should be done by
another CSP (or at least via CSP I/F).
--
Shigeru HANADA
