$query = $this->entityManager->createQueryBuilder()
        ->select('sm')
        ->from('AppBundle:ScheduleMeta', 'sm')
        ->innerJoin('AppBundle:ScheduleEvent', 'se', 'WITH', 'sm = se.scheduleMeta')
        ->leftJoin('sm.pricingOptions', 'po')
        ->andWhere('po.id IS NOT NULL OR se.isFree = true')
        ->getQuery()
        ->useQueryCache(true)
    ;