code: def execute_async(self, operation, parameters=None, configuration=None):
          
          log.debug('Executing query %s', operation)
  
          def op():
              if parameters:
                  self._last_operation_string = _bind_parameters(operation,
                                                                 parameters)
              else:
                  self._last_operation_string = operation
  
              op = self.session.execute(self._last_operation_string,
                                        configuration,
                                        run_async=True)
              self._last_operation = op
  
          self._execute_async(op)
docs: Asynchronously execute a SQL query.
  
          Immediately returns after query is sent to the HS2 server.  Poll with
          `is_executing`. A call to `fetch*` will block.
  
          Parameters
          ----------
          operation : str
              The SQL query to execute.
          parameters : str, optional
              Parameters to be bound to variables in the SQL query, if any.
              Impyla supports all DB API `paramstyle`s, including `qmark`,
              `numeric`, `named`, `format`, `pyformat`.
          configuration : dict of str keys and values, optional
              Configuration overlay for this query.
  
          Returns
          -------
          NoneType
              Results are available through a call to `fetch*`.