Bruce Momjian <bruce(at)momjian(dot)us> writes:
> That's what I thought too, but I see a schema file in pg_extensions:
Read the manual.
> Should we hard-code a pg_catalog plpgsql to be skipped in pg_dump?
No, I don't think so.
The real issue here is that we don't have a notion of a "built-in
extension". I think this was specifically debated back when we
extension-ified plpgsql, though I don't recall details of why
we ended up not doing that. Maybe the idea was that you could
drop and then re-add plpgsql? Anyway, I think this is not such
a simple issue and a one-line hack in pg_dump is not likely to
improve matters.
regards, tom lane