zhongjiajie commented on issue #6950: [AIRFLOW-6392] Remove cyclic dependency baseoperator <-> helpers URL: https://github.com/apache/airflow/pull/6950#issuecomment-569910783 > These functions are used by users, so we should think about backward compatibility. I submit https://github.com/apache/airflow/pull/4779 due to use bit shift will so lengthy in some situation as I comment in https://github.com/apache/airflow/pull/4779#issuecomment-467694805, but when I use `chain` could be more easy using `chain(*[lists_of_task])`, So IMO and situation, I think function `chain` is useful and I will not remove it, that my point
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