docs: def _load_text_csv_file(self, filename, separator=',', **kwargs):
          """Return a pair RDD where key is taken from first column, remaining columns are named after their column id as string"""
          rdd_input = self.sc.textFile(filename)
  
          def load_csv_record(line):
              input_stream = StringIO.StringIO(line)
              reader = csv.reader(input_stream, delimiter=',')
              # key in first column, remaining columns 1..n become dict key values
              payload = reader.next()
              key = payload[0]
              rest = payload[1:]
              # generate dict of "1": first value, "2": second value, ...
              d = {}
              for (cell,i) in izip(rest, range(1,1+len(rest))):
                  d[str(i)] = cell
              # just in case, add "0": key
              d["0"] = key
              return (key, d)
  
          rdd_parsed = rdd_input.map(load_csv_record)
          return rdd_parsed