Symfony doctrine group by max date timestamp - php

Question

I would like to select values from table o by some conditions and grouped by groupKey. This query is working fine, but now query return first grouped value for my. I need to retrieve grouped values with MAX timestamp.
An example if there are two or more values with groupKey I need that one where o.createdAt value is newer.
$qb = $this->createQueryBuilder('order');
$expr = $qb->expr();
return $qb
->select('order, (CASE WHEN order.tsmOrderNumber IS NOT NULL THEN order.tsmOrderNumber ELSE order.id END) as groupKey')
->where('order.user =:user')
->andWhere('order.status =:status')
->andWhere(
$expr->orX(
$expr->andX(
$expr->isNotNull('order.wayBillNumber'),
$expr->neq('order.wayBillNumber', "''"),
$expr->between('order.createdAt', ':dateFrom', ':dateTo')
),
$expr->andX(
$expr->orX(
$expr->isNull('o.tsmNumber'),
$expr->eq('o.tsmNumber', '\'\'')
),
$expr->between('order.createdAt', ':dateFrom2', ':dateTo')
)
)
)
->setParameters(
[
'status' => Order::STATUS_COMPLETED,
'user' => $user,
'dateFrom' => (new \DateTime())->modify('-2 month'),
'dateFrom2' => (new \DateTime())->modify('-6 month'),
'dateTo' => new \DateTime()
]
)
->groupBy('groupKey')
->orderBy('order.createdAt', 'DESC')
->getQuery()
->getResult();