Karsten Hilbert <Karsten.Hilbert@gmx.net> writes:
> For that matter, is DELETE FROM pg_collation ... equivalent
> to DROP COLLATION ?
There's also entries in pg_depend and pg_shdepend to worry
about.
For these built-in collations, as of v15 there are no such
entries, but prior versions had explicit "pin" entries.
regards, tom lane