It is not possible to deal with the csv file which contains mutli-formats(each row with different fields)

The following are some rules regarding the rules on .csv file.

- All records should have the same number of fields, in the same order. (https://en.wikipedia.org/wiki/Comma-separated_values)

- Rules typical of these and other "CSV" specifications and implementations are as follows.

1). CSV is a delimited data format that has fields andcolumns separated by the comma character and records and rows terminated by newlines.

2). A CSV file does not require a specific character encoding, byte order, or line terminator format. Ssome software does not support all line-end variations.

3). A record ends at a line terminator. However, line terminators can be embedded as data within fields, so software must recognize quoted line-separators in order to correctly assemble an entire record from multiple lines.

4). All records should have the same number of fields in the same order.