Issac_musashi, obrigado mas não resolveu meu problema..
Com sua "idéia" tentei alterar para:
$em = $this->getEntityManager();
$query = $em->createQuery('
SELECT
SUM(PERIOD_DIFF(DATE_FORMAT(q.dtFim, \'%Y%m\'),
DATE_FORMAT(q.dtInicio, \'%Y%m\'))) AS totalMes
FROM
app:Bolsista q
WHERE
q.pessoa_id = :pessoa AND
q.tipobolsista_id = :tipoBolsaEstagio
ativo = :ativo')
->setParameter('pessoa', $pessoaId)
->setParameter('tipoBolsaEstagio', $tipoBolsa)
->setParameter('ativo', 1);
return $query->execute()->fetchAll();
mas mesmo assim não funfou!
=/
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