Currently, CSV parser supports the following 6 data type: bool, integer, string, float, double and date. This parser don’t support data type inference, so user should give the right setting for each column in the input schema defination.
For the input CSV file, adjacent fields must be separated by a single comma (Other delimiter is not supported). And any field can be quoted. Note that, the nested comma must be quoted and the embedded double-quote characters and line breaks does not being supported so far. Also, the leading and trailing spaces between fields, as well as the heading record is forbidden.
For output data, CSV parser will allow user to select some columns and only the selected columns would be output by the object-stream interface.