| From: | Richard Guo <guofenglinux(at)gmail(dot)com> |
|---|---|
| To: | Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com> |
| Cc: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, David Rowley <dgrowleyml(at)gmail(dot)com>, Ranier Vilela <ranier(dot)vf(at)gmail(dot)com> |
| Subject: | Re: Improve list manipulation in several places |
| Date: | 2023-07-04 00:48:00 |
| Message-ID: | CAMbWs4-eK-2PUm+HCv08Jf6BqR8vb0MVhqBB7ZS3NQ6pK8GAew@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, Jul 3, 2023 at 5:41 PM Peter Eisentraut <
peter(dot)eisentraut(at)enterprisedb(dot)com> wrote:
> On 09.05.23 05:13, Richard Guo wrote:
> > Yeah, maybe this is the reason I failed to devise a query that shows any
> > performance gain. I tried with a query which makes the 'all_pathkeys'
> > in sort_inner_and_outer being length of 500 and still cannot see any
> > notable performance improvements gained by list_copy_move_nth_to_head.
> > Maybe the cost of other parts of planning swamps the performance gain
> > here? Now I agree that maybe 0002 is not worthwhile to do.
>
> I have committed patch 0001. Since you have withdrawn 0002, this closes
> the commit fest item.
Thanks for pushing it and closing the item!
Thanks
Richard
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