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https://issues.apache.org/jira/browse/AIRFLOW-3958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16869759#comment-16869759
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ASF subversion and git services commented on AIRFLOW-3958:
----------------------------------------------------------

Commit 75bec88f04705884de58facaac97338a5b5b439a in airflow's branch 
refs/heads/master from Jiajie Zhong
[ https://gitbox.apache.org/repos/asf?p=airflow.git;h=75bec88 ]

[AIRFLOW-3958] Support list tasks as upstream in chain (#4779)



> Support list type as upstream in helper.chain
> ---------------------------------------------
>
>                 Key: AIRFLOW-3958
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-3958
>             Project: Apache Airflow
>          Issue Type: Improvement
>          Components: utils
>    Affects Versions: 1.10.2
>            Reporter: zhongjiajie
>            Assignee: zhongjiajie
>            Priority: Major
>              Labels: patch
>             Fix For: 1.10.2
>
>
> For now on, `airflow.utils.helpers.chain` only support list as downstream, 
> but not upstream. This ticket is to support list as upstream.
> Only support
> {code:java}
> task_1 --> task_2 --> task_3 --> task_4
> or
>                   /--> task_3
> task_1 --> task_2 
>                   \--> task_4{code}
> This improvement to be support
> {code:java}
>                   /--> task_3 \
> task_1 --> task_2              --> task_5
>                   \--> task_4 /
> {code}



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