Re: using custom scan nodes to prototype parallel sequential scan
| От | David Rowley |
|---|---|
| Тема | Re: using custom scan nodes to prototype parallel sequential scan |
| Дата | |
| Msg-id | CAHoyFK-4kb-OR2ukvibvi=X2GQZ=9_VsPTLrL2bE+B3r=n4a=w@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: using custom scan nodes to prototype parallel sequential scan (Simon Riggs <simon@2ndQuadrant.com>) |
| Ответы |
Re: using custom scan nodes to prototype parallel
sequential scan
|
| Список | pgsql-hackers |
On 18 November 2014 05:19, Simon Riggs <simon@2ndquadrant.com> wrote:
On 14 November 2014 11:02, Kouhei Kaigai <kaigai@ak.jp.nec.com> wrote:
> I'd like to throw community folks a question.
> Did someone have a discussion to the challenge of aggregate push-down across
> relations join in the past? It potentially reduces number of rows to be joined.
> If we already had, I'd like to check up the discussion at that time.
Yes, I was looking at aggregate pushdown. I think it needs the same
changes to aggregates discussed upthread.
I have something that I've been working on locally. It's far from ready, but it does work in very simple cases, and shows a nice performance boost. I'll start another thread soon and copy you both in. Perhaps we can share some ideas.
Regards
David Rowley
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