ALTER ... DEPENDS ON EXTENSION (dependencies of type 'x' on an
extension) was found to have a few problems. One was fixed as
CVE-2020-1720. Other issues:
* pg_dump does not reproduce database state correctly.
The attached 0000 fixes it.
* More than one 'x' dependencies are allowed for the same object on the
same extension. That's useless and polluting, so should be prevented.
* There's no way to remove an 'x' dependency.
I'll send patches for the other two issues as replies later. (I
discovered an issue in my 0001, for the second one, just as I was
sending.)
--
Álvaro Herrera
