zhongjiajie commented on issue #4779: [AIRFLOW-3958] Support list tasks as upstream in chain URL: https://github.com/apache/airflow/pull/4779#issuecomment-474158762 @feng-tao @Fokko @XD-DENG I got this, I will close this and submit a new PR to remove `airflow.utils.helpers.chain`, thank for your advice.
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