In my text file, there are several fields that have the same name, I would like to add an indicator when this field appears a second time.
example:
ipAddress (first occurrence)
ipAddress 'second occurrence) => ipAddress_1
Note that this procedure is to be adapted per group.
use Counter Generation followed by Rank node where grouping attributes are group and filed columns while Ordinal raning is done ascending on Counter column.
You could try using RowID, twice. First time, use it to replace the current row IDs with the contents of the column containing your field, and make sure you check the option to generate unique IDs. In the second node, use it to store the row IDs in a new column