presto-hive/src/main/java/io/prestosql/plugin/hive/metastore/thrift/ThriftHiveMetastoreClient.java/ThriftHiveMetastoreClient/listRoles
class ThriftHiveMetastoreClient:    @Override
    public List<Role> listRoles(String principalName, PrincipalType principalType)
            throws TException
    {
        return client.list_roles(principalName, principalType);
    }