presto-hive/src/main/java/io/prestosql/plugin/hive/metastore/SemiTransactionalHiveMetastore.java/TableAndMore/getPrincipalPrivileges
class TableAndMore:        public PrincipalPrivileges getPrincipalPrivileges()
        {
            checkState(principalPrivileges.isPresent());
            return principalPrivileges.get();
        }