Re: Improve list manipulation in several places
| От | Richard Guo |
|---|---|
| Тема | Re: Improve list manipulation in several places |
| Дата | |
| Msg-id | CAMbWs4-vs=SGXYYs89Kkqdcn78emKGdbzqF_p3v4WX5C9VnYGw@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: Improve list manipulation in several places (Peter Eisentraut <peter.eisentraut@enterprisedb.com>) |
| Список | pgsql-hackers |
On Mon, May 8, 2023 at 11:22 PM Peter Eisentraut <peter.eisentraut@enterprisedb.com> wrote:
On 23.04.23 08:42, Richard Guo wrote:
> Thanks for the suggestion. I've split the patch into two as attached.
> 0001 is just a minor simplification by replacing lfirst(list_head(list))
> with linitial(list). 0002 introduces new functions to reduce the
> movement of list elements in several places so as to gain performance
> improvement and benefit future callers.
These look sensible to me. If you could show some numbers that support
the claim that there is a performance advantage, it would be even more
convincing.
Thanks Peter for looking at those patches. I tried to devise a query to
show performance gain but did not succeed :-(. So I begin to wonder if
0002 is worthwhile to do, as it seems that it does not solve any real
problem.
Thanks
Richard
show performance gain but did not succeed :-(. So I begin to wonder if
0002 is worthwhile to do, as it seems that it does not solve any real
problem.
Thanks
Richard
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