On Wed, Dec 16, 2015 at 5:59 AM, David Rowley
> One thing I noticed is that you're only enabling Parallel aggregation when
> there's already a Gather node in the plan. Perhaps this is fine for a proof
> of concept, but I'm wondering how we can move forward from this to something
> that can be committed.
As far as that goes, I think the infrastructure introduced by the
parallel join patch will be quite helpful here. That introduces the
concept of a "partial path" - that is, a path that needs a Gather node
in order to be completed. And that's exactly what you need here:
after join planning, if there's a partial path available for the final
rel, then you can consider
FinalizeAggregate->Gather->PartialAggregate->[the best partial path].
Of course, whether a partial path is available or not, you can
consider Aggregate->[the best regular old path].
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