Re: pg_upgrade silently truncates nextMultiOffset to 32 bits

Sorry, I missed this reply of yours earlier.

On 27/08/2026 10:35, Masahiko Sawada wrote:
> On Thu, Aug 27, 2026 at 12:06 AM Chao Li <li(dot)evan(dot)chao(at)gmail(dot)com> wrote:
>> bigint is a signed int64, so it cannot represent the full uint64 range, although perhaps this is only a theoretical concern. If we want to avoid this limitation, should we use numeric instead?
>
> I'd prefer to keep bigint here. pg_get_multixact_stats() already
> reports num_members and members_size as int8, and both are derived
> from these same offsets. Also, other fields in pg_control_checkpoint()
> are fixed-width types, whereas numeric is pass-by-reference.
>
> I considered using xid8 instead but it has only comparison operators
> and no arithmetic, so we couldn't compute a delta between two
> checkpoints.

Hmm, that's a good point, although 'xid' didn't have those operators or
arithmetic either.

- Heikki