This special process is used to remove excess commas from a CSV file. Those commas after the last piece of valid data will be removed.
For example the file before applying this process looks like:
Data1,Data2,Data3,Data4,,,
,, ,
Data1,Data2,Data3,Data4,,,
Data1,Data2,Data3,Data4
After applying this process it looks like:
Data1,Data2,Data3,Data4
,,
Data1,Data2,Data3,Data4
Data1,Data2,Data3,Data4
Data1,Data2,Data3,Data4
Notice the space character, though not visible/shown in row 2, column 2, is valid data.