presto-hive/src/main/java/io/prestosql/plugin/hive/security/SqlStandardAccessControl.java/SqlStandardAccessControl/checkCanDropRole
class SqlStandardAccessControl:    @Override
    public void checkCanDropRole(ConnectorSecurityContext context, String role)
    {
        if (!isAdmin(context)) {
            denyDropRole(role);
        }
    }