Please refer this article if you face any issues during CSV file ingestion
If the number of columns in the header of the CSV file does not match the number of columns in the data we face issues during ingestion.
The Fetch Metadata cannot work with wrong header information as the column names have to be assigned from the header.
Please follow the below steps in order to fix the issue,
Always try to get the header information corrected in the CSV file which is used.
Enter the metadata information on the "Edit Schema" page manually.