| From: | Greg Nancarrow <gregn4422(at)gmail(dot)com> |
|---|---|
| To: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
| Cc: | Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Parallel INSERT (INTO ... SELECT ...) |
| Date: | 2020-10-12 01:44:24 |
| Message-ID: | CAJcOf-dKsm3H-uB9NYN73yt51w7M7+7DOcaM2AmwbPBhaZN34A@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Sun, Oct 11, 2020 at 1:05 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
>
> On Sat, Oct 10, 2020 at 5:25 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> >
> > 8. You have made changes related to trigger execution for Gather node,
> > don't we need similar changes for GatherMerge node?
> >
> ..
> >
> > 10. Don't we need a change similar to cost_gather in
> > cost_gather_merge? It seems you have made only partial changes for
> > GatherMerge node.
> >
>
> Please ignore these two comments as we can't push Insert to workers
> when GatherMerge is involved as a leader backend does the final phase
> (merge the results by workers). So, we can only push the Select part
> of the statement.
>
Precisely, that's why I didn't make those changes for GatherMerge.
Regards,
Greg Nancarrow
Fujitsu Australia
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