198de79612
DeleteInitPrivs did not get the memo about how, when dropping a whole object (with subid == 0), you should drop entries relating to its sub-objects too. This is visible in the test_pg_dump test case if one drops the extension at the end: the entry for GRANT SELECT(col1) ON regress_pg_dump_table TO public; was still present in pg_init_privs afterwards, although it was pointing to a dangling table OID. Noted while fooling with a fix for REASSIGN OWNED for pg_init_privs entries. This bug is aboriginal in the pg_init_privs feature though, and there seems no reason not to back-patch the fix.
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