Re: Parallel INSERT (INTO ... SELECT ...)

On Wed, Dec 23, 2020 at 7:52 AM Hou, Zhijie <houzj.fnst@cn.fujitsu.com> wrote:
>
> Hi
>
> > > I may be wrong, and if I miss sth in previous mails, please give me some
> > hints.
> > > IMO, serial insertion with underlying parallel SELECT can be
> > > considered for foreign table or temporary table, as the insertions only
> > happened in the leader process.
> > >
> >
> > I don't think we support parallel scan for temporary tables. Can you please
> > try once both of these operations without Insert being involved? If you
> > are able to produce a parallel plan without Insert then we can see why it
> > is not supported with Insert.
>
> Sorry, may be I did not express it clearly, I actually means the case when insert's target(not in select part) table
istemporary.
 
> And you are right that parallel select is not enabled when temporary table is in select part.
>

I think Select can be parallel for this case and we should support this case.

-- 
With Regards,
Amit Kapila.