From: | Ranier Vilela <ranier(dot)vf(at)gmail(dot)com> |
---|---|
To: | Richard Guo <guofenglinux(at)gmail(dot)com> |
Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, David Rowley <dgrowleyml(at)gmail(dot)com> |
Subject: | Re: Improve list manipulation in several places |
Date: | 2023-04-21 11:16:01 |
Message-ID: | CAEudQArQSosP9qNR62M6_44t_iicQ4f9JAWmB5nriRccx-TfeQ@mail.gmail.com |
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Em sex., 21 de abr. de 2023 às 04:34, Richard Guo <guofenglinux(at)gmail(dot)com>
escreveu:
> There was discussion in [1] about improvements to list manipulation in
> several places. But since the discussion is not related to the topic in
> that thread, fork a new thread here and attach a patch to show my
> thoughts.
>
> Some are just cosmetic changes by using macros. The others should have
> performance gain from the avoidance of moving list entries. But I doubt
> the performance gain can be noticed or measured, as currently there are
> only a few places affected by the change. I still think the changes are
> worthwhile though, because it is very likely that future usage of the
> same scenario can benefit from these changes.
>
+1
Perhaps list_delete_nth_cell needs to check NIL too?
+ if (list == NIL)
+ return NIL;
+lcons_copy(void *datum, const List *list)
+lappend_copy(const List *list, void *datum)
list param pointer can be const here not?
regards,
Ranier Vilela
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