| From: | Zhihong Yu <zyu(at)yugabyte(dot)com> |
|---|---|
| To: | David Rowley <dgrowleyml(at)gmail(dot)com> |
| Cc: | PostgreSQL Developers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Allow parallel DISTINCT |
| Date: | 2021-08-17 14:47:40 |
| Message-ID: | CALNJ-vRLd63reKpo2fgeenV+DuoXj-bdT36upL3brx8c+3DEKw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Aug 17, 2021 at 3:59 AM David Rowley <dgrowleyml(at)gmail(dot)com> wrote:
> On Tue, 17 Aug 2021 at 20:07, Zhihong Yu <zyu(at)yugabyte(dot)com> wrote:
> > Can you attach updated patch so that we know more detail about the two
> new functions; create_final_distinct_paths and
> > create_partial_distinct_paths ?
>
> Must've fallen off in transit :)
>
> David
>
Hi,
Since create_partial_distinct_paths() calls create_final_distinct_paths(),
I wonder if numDistinctRows can be passed to create_final_distinct_paths()
so that the latter doesn't need to call estimate_num_groups().
Cheers
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