Check this option if you use temporary variable names for simplifying the syntax for any of the two list-style fields above ( List of Variable Names and Types and List of Variable Names and Lengths ) and want to have the original column names as defined in a row of the raw input file.Note : You must specify a nonzero value for the Row Number of Variable Names for this option to take effect.Caution : Renaming can take a long time for extremely wide data sets.