code: def add_column_value(self, val: bytes):
      if val == b"NULL":
          self.add_int32(-1)
          return self
  
      self.add_int32(len(val))
      self.add_bytes(val)
      return self
  
imports: import struct
  from typing import List, Any, BinaryIO, Sequence, Dict
  from mindsdb.api.postgres.postgres_proxy.utilities import strip_null_byte
  from mindsdb.utilities import log
  import time
  from mindsdb.api.postgres.postgres_proxy.postgres_packets.postgres_fields import PostgresField
  from mindsdb.api.postgres.postgres_proxy.postgres_packets.postgres_message_identifiers import PostgresBackendMessageIdentifier, PostgresFrontendMessageIdentifier, PostgresAuthType
label_desc: Use image node_id 14 for calling the PostgresPacketBuilder obj's underlying member method code with example usage: obj.add_column_value(val) and returns: self, self