code: def _to_json(self):
      params = {
          "columns": self.to_postgres_columns(self.columns),
          "params": self.to_postgres_columns(self.params),
          "data": self.data,
          "state_track": self.state_track,
          "server_status": self.server_status,
          "is_executed": self.is_executed,
          "session": self.session.to_json(),
      }
      return params
  
imports: from typing import Union
  from mindsdb_sql import parse_sql
  from mindsdb_sql.planner import utils
  from numpy import dtype
  from pandas.api import types
  from mindsdb.api.executor import SQLQuery, Column
  from mindsdb.api.mysql.mysql_proxy.utilities.lightwood_dtype import dtype
  from mindsdb.api.executor.command_executor import ExecuteCommands
  from mindsdb.api.mysql.mysql_proxy.utilities import SqlApiException
  from mindsdb.api.postgres.postgres_proxy.postgres_packets.postgres_fields import POSTGRES_TYPES
  from mindsdb.utilities import log
label_desc: Use image node_id 7 for calling the Executor obj's underlying member method code with example usage: obj._to_json() and returns: params