private function setVisitorIds(DataTable $dataTable)
    {
        foreach ($dataTable->getRows() as $row) {
            $userId = $row->getColumn('label');
            if (isset($this->visitorIdsUserIdsMap[$userId])) {
                $row->setMetadata(self::VISITOR_ID_FIELD, $this->visitorIdsUserIdsMap[$userId]);
            }
        }
    }