On Tue, Nov 3, 2015 at 8:15 AM, Kouhei Kaigai <kai...@ak.jp.nec.com> wrote:
> A challenge is that junk wholerow references on behalf of ROW_MARK_COPY
> are injected by preprocess_targetlist(). It is earlier than the main path
> consideration by query_planner(), thus, it is not predictable how remote
> query shall be executed at this point.

Oh, dear.  That seems like a rather serious problem for my approach.

> If ROW_MARK_COPY, base tuple image is fetched using this junk attribute.
> So, here is two options if we allow to put joined tuple on either of
> es_epqTuple[].

Neither of these sounds viable to me.

I'm inclined to go back to something like what you proposed here:


Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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