Monitor::loadActivityResponsibleIds

protected function loadActivityResponsibleIds(array $identifiers): array
{
	if (empty($identifiers))
	{
		return [];
	}
	$bindQuery = ActivityBindingTable::query()
		->registerRuntimeField(
			'',
			new ReferenceField('A',
				ActivityTable::getEntity(),
				['=ref.ID' => 'this.ACTIVITY_ID'],
				['join_type' => Join::TYPE_INNER])
		)
		->setSelect(['ACTIVITY_ID', 'OWNER_ID', 'OWNER_TYPE_ID'])
		->addSelect('A.RESPONSIBLE_ID', 'RESPONSIBLE_ID');

	$orCt = new ConditionTree();
	$orCt->logic(ConditionTree::LOGIC_OR);
	foreach ($identifiers as $identifier)
	{
		$ct = new ConditionTree();
		$ct->where('OWNER_ID', $identifier->getEntityId());
		$ct->where('OWNER_TYPE_ID', $identifier->getEntityTypeId());

		$orCt->where($ct);
	}
	$bindQuery->where($orCt);
	$bindings = $bindQuery->fetchAll();

	if (empty($bindings))
	{
		return [];
	}

	$result = [];
	foreach ($bindings as $bind)
	{
		$key = (new ItemIdentifier($bind['OWNER_TYPE_ID'], $bind['OWNER_ID']))->getHash();
		if (!isset($result[$key]))
		{
			$result[$key] = [];
		}
		$result[$key][] = (int) $bind['RESPONSIBLE_ID'];
	}

	return array_map(fn($resp) => array_unique($resp), $result);
}