PersonDedupeDataSource::innerCalculateEntityCount

protected function innerCalculateEntityCount(DuplicateCriterion $criterion, array $options = null)
{
	$entityTypeID = $this->getEntityTypeID();
	$enablePermissionCheck = $this->isPermissionCheckEnabled();
	$userID = $this->getUserID();

	$query = new Main\Entity\Query(DuplicatePersonMatchCodeTable::getEntity());
	$query->addSelect('QTY');
	$query->registerRuntimeField('', new Main\Entity\ExpressionField('QTY', 'COUNT(*)'));
	$query->addFilter('=ENTITY_TYPE_ID', $entityTypeID);

	if($enablePermissionCheck)
	{
		$permissionSql = $this->preparePermissionSql();
		if($permissionSql === false)
		{
			//Access denied;
			return 0;
		}
		if(is_string($permissionSql) && $permissionSql !== '')
		{
			$query->addFilter('@ENTITY_ID', new Main\DB\SqlExpression($permissionSql));
		}
	}

	$matches = $criterion->getMatches();
	$lastName = isset($matches['LAST_NAME']) ? $matches['LAST_NAME'] : '';
	if($lastName === '')
	{
		throw new Main\ArgumentException("Parameter 'LAST_NAME' is required.", 'matches');
	}
	$query->addFilter('=LAST_NAME', $lastName);
	$query->addFilter('=NAME', isset($matches['NAME']) ? $matches['NAME'] : '');
	$query->addFilter('=SECOND_NAME', isset($matches['SECOND_NAME']) ? $matches['SECOND_NAME'] : '');

	$rootEntityID = 0;
	if(is_array($options) && isset($options['ROOT_ENTITY_ID']))
	{
		$rootEntityID =  (int)$options['ROOT_ENTITY_ID'];
	}
	if($rootEntityID > 0)
	{
		$query->addFilter('!ENTITY_ID', $rootEntityID);
		$query->addFilter(
			'!@ENTITY_ID',
			DuplicateIndexMismatch::prepareQueryField($criterion, $entityTypeID, $rootEntityID, $userID)
		);
	}

	$query = DedupeDataSource::registerRuntimeFieldsByParams($query, $this->getParams());

	$limit = 0;
	if(is_array($options) && isset($options['LIMIT']))
	{
		$limit =  (int)$options['LIMIT'];
	}
	if($limit > 0)
	{
		$query->setLimit($limit);
	}

	$dbResult = $query->exec();
	$fields = $dbResult->fetch();
	return is_array($fields) && isset($fields['QTY']) ? intval($fields['QTY']) : 0;
}