'Get Logs of a command from Qubole
:param ti: Task Instance of the dag, used to determine the Quboles command id
:return: command log as text'

def get_log(self, ti):

    if (self.cmd is None):
        cmd_id = ti.xcom_pull(key='qbol_cmd_id', task_ids=self.task_id)
    Command.get_log_id(self.cls, cmd_id)
