Re: pg_upgrade problem with invalid indexes

Andres Freund <andres@2ndquadrant.com> writes:
> !indislive indexes are created during DROP INDEX CONCURRENTLY. Thats a
> different case than CREATE INDEX CONCURRENTLY. Accessing their
> definition is actually problematic because i can vanish while youre
> examing it which could cause errors both in the backend and in pg_dump.

That's true of any index, not just !indislive ones.  If you're doing DDL
during a pg_dump, and that makes it fail, you get to keep both pieces.
        regards, tom lane