code: @Override
      public Object[] readNext(List<String> columnNames) throws IOException {
          return sasFileParser.readNext(columnNames);
      }
docs: Reads all rows from the sas7bdat file. For each row, only the columns defined in the list are read.
  
  @param columnNames list of column names which should be processed.
  @return an array of array objects whose elements can be objects of the following classes: double, long,
  int, byte[], Date depending on the column they are in.