code: def to_bytes(self, request, request_id):
      flags = struct.pack("<i", 0)  # TODO
      cursor_id = struct.pack("<q", 0)  # TODO
      starting_from = struct.pack("<i", 0)  # TODO
      number_returned = struct.pack("<i", len([request]))
      reply_id = 123  # TODO
      response_to = request_id
  
      logger.debug(f"RET docs={request}")
  
      data = b"".join(
          [flags, cursor_id, starting_from, number_returned]
      )
      data += b"".join([bson.BSON.encode(doc) for doc in [request]])
  
      message = struct.pack("<i", 16 + len(data))
      message += struct.pack("<i", reply_id)
      message += struct.pack("<i", response_to)
      message += struct.pack("<i", OP_REPLY)
  
      return message + data
  
imports: import socketserver
  import socket
  import struct
  import bson
  import traceback
  from bson import codec_options
  from collections import OrderedDict
  from abc import abstractmethod
  from bson.codec_options import CodecOptions
  from bson.codec_options import TypeCodec
  from bson.codec_options import TypeRegistry
  import numpy
  import datetime
  import mindsdb.api.mongo.functions
  from mindsdb.api.mongo.classes import RespondersCollection, Session
  from mindsdb.interfaces.storage import db
  from mindsdb.interfaces.model.model_controller import ModelController
  from mindsdb.interfaces.database.integrations import integration_controller
  from mindsdb.interfaces.database.projects import ProjectController
  from mindsdb.interfaces.database.database import DatabaseController
  from mindsdb.utilities.context import context
  from mindsdb.utilities import log
label_desc: Use image node_id 2 for calling the OpQueryResponder obj's underlying member method code with example usage: obj.to_bytes(request, request_id) and returns: unknown