fix csv_scan_node bug (#115)
fix csv_scan_node bug (#115)


imay/palo,morningman/palo,morningman/palo,lingbin/palo,cyongli/palo,cyongli/palo,imay/palo,imay/palo,cyongli/palo,cyongli/palo,morningman/palo,lingbin/palo,cyongli/palo,imay/palo,morningman/palo,cyongli/palo,imay/palo,lingbin/palo,lingbin/palo,morningman/palo,morningman/palo,lingbin/palo,imay/palo,lingbin/palo