Chapman Flack <chap@anastigmatix.net> writes:
> Is there an inherent technical or policy reason for pg_upgrade not to
> preserve comments on predefined roles (or on predefined objects generally)?
I think this is absolutely out of scope for pg_dump. We generally expect
that system objects' properties are not dumped, because they might be
different in a newer version, and overwriting the system definition with
a possibly-obsolete version would be a bad thing.
You could quibble about comments being a different matter, but I don't
buy it.
Also, our one venture into this space (allowing custom modifications of
system-object privileges to be propagated by pg_dump) has IMV been an
unmitigated disaster. Years later, it *still* has unresolved bugs and
definitional issues. So I'm going to run away screaming from any proposal
to do likewise for other object properties.
> For that matter, would it be objectionable for the predefined roles to
> come with comments right out of the box?
That, however, seems reasonable enough. We deliver built-in functions and
operators with comments, so why not roles?
> Another objection might be that they'd presumably be subject to translation,
> and would need some way for initdb to install the proper localized versions.
We've not worried about that for functions/operators.
> I've appended the comments we use for them at $work, anyway.
IMO these would have to be shortened quite a bit to be friendly for
"\du+" displays. I'm not against the concept though.
regards, tom lane