code: def _parse_list_value_pbs(rows, row_type):
      
      result = []
      for row in rows:
          row_data = []
          for value_pb, field in zip(row.values, row_type.fields):
              row_data.append(_parse_value_pb(value_pb, field.type))
          result.append(row_data)
      return result
docs: Convert a list of ListValue protobufs into a list of list of cell data.
  
      :type rows: list of :class:`~google.protobuf.struct_pb2.ListValue`
      :param rows: row data returned from a read/query
  
      :type row_type: :class:`~google.cloud.spanner_v1.proto.type_pb2.StructType`
      :param row_type: row schema specification
  
      :rtype: list of list of cell data
      :returns: data for the rows, coerced into appropriate types