Nikita Malakhov <hukutoc(at)gmail(dot)com> writes:
> Please advise on the idea of preserving pg_proc oids during pg_upgrade, in
> a way like relfilenodes, type id and so on. What are possible downsides of
> such a solution?
You have the burden of proof backwards. That would add a great deal
of new mechanism, and you haven't provided even one reason why it'd
be worth doing.
regards, tom lane