class_docstr: This handler handles connection and exectuin of Google BigQuery statements
docstr: Check the connection of the BigQuery
  :return: success status and error message if error occurs
docstr_tok: ["Check","the","connection","of","the","BigQuery",":","return",":","success","status","and","error","message","if","error","occurs"]
code: def check_connection(self) -> StatusResponse:
      """
      Check the connection of the BigQuery
      :return: success status and error message if error occurs
      """
      response = StatusResponse(False)
  
      try:
          client = self.connect()
          client.query("SELECT 1;")
  
          # check dataset exists
          client.get_dataset(self.connection_data["dataset"])
  
          response.success = True
      except Exception as e:
          logger.error(
              f'Error connecting to BigQuery {self.connection_data["project_id"]}, {e}!'
          )
          response.error_message = e
  
      if response.success is False and self.is_connected is True:
          self.is_connected = False
  
      return response
  
imports: import os
  import json
  from collections import OrderedDict
  from google.cloud import bigquery
  from google.oauth2 import service_account
  from sqlalchemy_bigquery.base import BigQueryDialect
  from mindsdb_sql.parser.ast.base import ASTNode
  from mindsdb_sql.render.sqlalchemy_render import SqlalchemyRender
  from mindsdb.integrations.libs.base import DatabaseHandler
  from mindsdb.integrations.libs.const import HANDLER_CONNECTION_ARG_TYPE
  from mindsdb.integrations.libs.response import HandlerStatusResponse, HandlerResponse, RESPONSE_TYPE
  from mindsdb.utilities import log
label_desc: Use image node_id 5 for calling the BigQueryHandler obj's underlying member method code with example usage: obj.check_connection() and returns: response