Re: pg_trgm comparison bug on cross-architecture replication due to different char implementation - Mailing list pgsql-hackers

On Tue, Apr 30, 2024 at 12:37 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
>
> Masahiko Sawada <sawada.mshk@gmail.com> writes:
> > On Tue, Apr 23, 2024 at 11:57 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> >> Reject as not a bug.  Discourage people from thinking that physical
> >> replication will work across architectures.
>
> > While cross-arch physical replication is not supported, I think having
> > architecture dependent differences is not good and It's legitimate to
> > fix it. FYI the 'char' data type comparison is done as though char is
> > unsigned. I've attached a small patch to fix it. What do you think?
>
> I think this will break existing indexes that are working fine.
> Yeah, it would have been better to avoid the difference, but
> it's too late now.

True. So it will be a PG18 item.

Regards,

--
Masahiko Sawada
Amazon Web Services: https://aws.amazon.com