Re: GiST nitpicks I want to discuss (and maybe eventually fix)

Hi,

On Tue, Oct 07, 2025 at 12:02:21AM +0500, Kirill Reshke wrote:
> On Mon, 6 Oct 2025 at 23:53, Andrey Borodin <x4mmm(at)yandex-team(dot)ru> wrote:
> > Makes sense. I hope one day we will add a catalog field to track
> > index creation version. This would pave the way to get rid of
> > invalid GiST tuples and return this flag too. We can use it for
> > something better.
>
> In the GIN index we have an index creation version, and it is placed
> on the metapage. So does btree, if i'm not mistaken . So, the index
> version is stored in data, not in catalog. I doubt we will support two
> technologies for one purpose. Since GiST index has no metapage, I
> doubt we will be successful here.

I always found it klunky that you need (AFAIK) an extension
(pageinspect) to figure out the btree/gin index version via its
meta-page and ISTM that this would be useful information to be stored in
the catalog.

Michael