public static function v101() {
        global $wpdb;

        $csgioct = self::getComboSetGroupItemsOrderCartTable();
        $rowIndexExists = (bool)(int)$wpdb->get_var('SELECT COUNT(*)
            FROM INFORMATION_SCHEMA.STATISTICS
            WHERE TABLE_SCHEMA = ' . '\'' . DB_NAME . '\'' . " AND TABLE_NAME = '{$csgioct}' AND INDEX_NAME = 'row';
        ");
        if ($rowIndexExists === true) {
            $wpdb->query("ALTER TABLE {$csgioct} DROP INDEX row;");
        }
    }