docs: def map_to_csv(fields, delimiter=","):
      """
      Convert dict to csv
  
      :param fields:
      :return:
      """
  
      def _list_to_csv(l):
          """
          Util function to overcome the use of files by in-memory io buffer
  
          :param l:
          :return:
          """
          io_file = io.StringIO()
          writer = csv.writer(io_file, quoting=csv.QUOTE_NONNUMERIC, lineterminator='', delimiter=delimiter)
          writer.writerow(l)
          return io_file.getvalue()
  
      def _app(current_tuple, e=None):
          if e is not None:
              return None, e
          csv_list = []
          for f in fields:
              if f in current_tuple:
                  csv_list.append(current_tuple[f])
              else:
                  e.update({"output": "expected field {} not found".format(f)})
                  return None, e
          return _list_to_csv(csv_list), e
      if fields is None or len(fields) == 0:
          return fixed_input(None, "no fields provided, cannot proceed without order")
      return _app