code: def done(self, retry=DEFAULT_RETRY):
          
          # Since the API to getQueryResults can hang up to the timeout value
          # (default of 10 seconds), set the timeout parameter to ensure that
          # the timeout from the futures API is respected. See:
          # https://github.com/GoogleCloudPlatform/google-cloud-python/issues/4135
          timeout_ms = None
          if self._done_timeout is not None:
              # Subtract a buffer for context switching, network latency, etc.
              timeout = self._done_timeout - _TIMEOUT_BUFFER_SECS
              timeout = max(min(timeout, 10), 0)
              self._done_timeout -= timeout
              self._done_timeout = max(0, self._done_timeout)
              timeout_ms = int(timeout * 1000)
  
          # Do not refresh is the state is already done, as the job will not
          # change once complete.
          if self.state != _DONE_STATE:
              self._query_results = self._client._get_query_results(
                  self.job_id,
                  retry,
                  project=self.project,
                  timeout_ms=timeout_ms,
                  location=self.location,
              )
  
              # Only reload the job once we know the query is complete.
              # This will ensure that fields such as the destination table are
              # correctly populated.
              if self._query_results.complete:
                  self.reload(retry=retry)
  
          return self.state == _DONE_STATE
docs: Refresh the job and checks if it is complete.
  
          :rtype: bool
          :returns: True if the job is complete, False otherwise.