class_docstr: Implementation based on:
  https://dev.mysql.com/doc/internals/en/com-query-response.html#packet-ProtocolText::ResultsetRow
  https://mariadb.com/kb/en/resultset-row/
code: def body(self):
      string = b""
      for x in self.value:
          if x is NULL_VALUE:
              string += x
          else:
              string += x.toStringPacket()
  
      self.setBody(string)
      return self._body
  
imports: from mindsdb.api.mysql.mysql_proxy.data_types.mysql_datum import Datum
  from mindsdb.api.mysql.mysql_proxy.data_types.mysql_packet import Packet
  from mindsdb.api.mysql.mysql_proxy.libs.constants.mysql import NULL_VALUE
label_desc: Use image node_id 2 for calling the ResultsetRowPacket obj's underlying member method code with example usage: obj.body() and returns: self