Robert Haas <> writes:
> On Mon, Mar 14, 2016 at 1:37 PM, Tom Lane <> wrote:
>> Yeah.  An alternative definition that would support that would be to
>> call the upper-path-providing callback for each FDW that's responsible
>> for any base relation of the query.  But I think that that would often
>> lead to a lot of redundant/wasted computation, and it's not clear to
>> me that we can support such cases without other changes as well.

> Sure, that's fine with me.  Are you going to go make these changes now?

Yeah, in a bit.

> Eventually, we might just support a configurable flag on FDWs where
> FDWs that want to do this sort of thing can request callbacks on every
> join and every upper rel in the query.  But that can wait.

That'd be a possibility, too.

                        regards, tom lane

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