Doctrine 2 - Using identifier of relation in DQL query

query_builder.php

<?php

$qb = $this->get('doctrine.orm.entity_manager')->createQueryBuilder();
$qb->select('v.id')
    ->from('CormesClipkitApiBundle:Video', 'v')
    ->where('IDENTITY(v.user) in (?1)')
    ->setParameter(1, $coIds)
    ->setFirstResult(rand(0, $count - $resnum))
    ->setMaxResults($resnum);
$result = $qb->getQuery()->getResult();