To find out whether a ROLE can DROP another in v16+. Prior to v16, just having CREATEROLE was enough, so it didn't really seem necessary.
But knowing whether DROP ROLE will work, w/o invalidating the current transaction, seems like something quite useful to know now, no? I can query pg_auth_members for admin_option, but only easily for direct membership. Taking into account indirect membership, which I assume applies, is exactly why pg_has_role() exists, no? Thanks for any insights. --DD
