Re: [PATCH] Proposal to Enable/Disable Index using ALTER INDEX

On Mon, Aug 04, 2025 at 01:19:46PM +0900, Michael Paquier wrote:
> On Sat, Aug 02, 2025 at 03:09:19PM -0400, Shayon Mukherjee wrote:
> > Per this plan, this would mean that pg_hint_plan would need to
> > support index-level hints, and it’s not a massive / impossible
> > task. But it also means that both systems aren't fighting/overriding
> > each other or making it difficult for users to understand when
> > exactly an index is being used or not. Ultimately, this would also
> > mean that `ALTER INDEX INVISIBLE` is a one-way door, and there is
> > only one way to control index visibility in core, which makes sense
> > to me.
>
> Sami has proposed a patch for pg_hint_plan that goes in the direction
> of a DisableIndex hint, which is doable even if it requires some work
> inside the extension code like some refactoring:
> https://github.com/ossc-db/pg_hint_plan/issues/226
>
> So I cannot say much about this proposal for core, but for
> pg_hint_plan I'm looking at adding that for the v18 release of the
> module, which is planned for the end of August/beginning of September.

FWIW if anyone actually needs it, that feature had existed for decades in
plantuner: http://www.sigaev.ru/git/gitweb.cgi?p=plantuner.git;a=summary