On 26/08/2019 10:59, Andrey Borodin wrote:
> Hi!
>
> In many cases GiST index can be build fast using z-order sorting.
>
> I've looked into proof of concept by Nikita Glukhov [0] and it looks very interesting.
> So, I've implemented yet another version of B-tree-like GiST build.
Cool!
> My biggest concern is that passing function to relation option seems
> a bit hacky. You can pass there any function matching sort support
> signature. Embedding this function into opclass makes no sense: it
> does not affect scan anyhow.
I think it should be a new, optional, GiST "AM support function", in
pg_amproc. That's how the sort support functions are defined for B-tree
opfamilies, too.
- Heikki