On Fri, 2023-02-17 at 09:05 -0800, Andres Freund wrote:
> > Thinking about this more, it's not clear to me if this would be in
> > scope for pg_upgrade or not.
>
> I don't think we should consider changing the default collation
> provider
> without making this more seamless, one way or another.
I guess I'm fine hacking pg_upgrade, but I think I'd like to make it
conditional on this specific case: only perform the fixup if the old
cluster is 15 or earlier and using libc and the newer cluster is 16 or
later and using icu.
There's already a check that the new cluster is empty, so I think it's
safe to hack the pg_database locale fields.
Regards,
Jeff Davis
>
