public function createNativeNamedQuery($queryName)
    {
        $queryMapping   = $this->_class->getNamedNativeQuery($queryName);
        $rsm            = new Query\ResultSetMappingBuilder($this->_em);
        $rsm->addNamedNativeQueryMapping($this->_class, $queryMapping);

        return $this->_em->createNativeQuery($queryMapping['query'], $rsm);
    }