private function rememberVisitorId($row)
    {
        if (!empty($row[self::USER_ID_FIELD]) && !empty($row[self::VISITOR_ID_FIELD])) {
            $this->visitorIdsUserIdsMap[$row[self::USER_ID_FIELD]] = $row[self::VISITOR_ID_FIELD];
        }
    }
private function rememberVisitorId($row)
    {
        if (!empty($row[self::USER_ID_FIELD]) && !empty($row[self::VISITOR_ID_FIELD])) {
            $this->visitorIdsUserIdsMap[$row[self::USER_ID_FIELD]] = $row[self::VISITOR_ID_FIELD];
        }
    }
private function rememberVisitorId ( $ row ) { if ( ! empty ( $ row [ self :: USER_ID_FIELD ] ) && ! empty ( $ row [ self :: VISITOR_ID_FIELD ] ) ) { $ this -> visitorIdsUserIdsMap [ $ row [ self :: USER_ID_FIELD ] ] = $ row [ self :: VISITOR_ID_FIELD ] ; } }
Remember visitor ID per user. We use it to fill metadata before actual inserting rows to DB.

@param array $row
Remember visitor ID per user . We use it to fill metadata before actual inserting rows to DB .