[GitHub] [airflow] yuqian90 opened a new pull request #7276: [AIRFLOW-5391] Do not run skipped tasks when they are cleared

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yuqian90 opened a new pull request #7276: [AIRFLOW-5391] Do not run skipped tasks when they are cleared
URL: https://github.com/apache/airflow/pull/7276
 
 
   This PR fixes the following issue:
   
   If a task is skipped by ``BranchPythonOperator``, ``BaseBranchOperator`` orr ``ShortCircuitOperator`` and the user then clears the skipped task, it'll execute. 
   
   After this PR:
   The ``NotPreviouslySkippedDep`` rule will first evaluate if a task has a direct ``SkipMixin`` parent that has decided to skip it. This is done by examining the XCom data stored by ``SkipMixin.skip()`` or ``SkipMixin.skip_all_except()``.
   
   The implementation is inspired by the author of [this blog](https://blog.diffractive.io/2018/08/07/replacement-shortcircuitoperator-for-airflow/).
   
   ---
   Issue link: [AIRFLOW-5391](https://issues.apache.org/jira/browse/AIRFLOW-5391)
   
   Make sure to mark the boxes below before creating PR: [x]
   
   - [x] Description above provides context of the change
   - [x] Commit message/PR title starts with `[AIRFLOW-NNNN]`. AIRFLOW-NNNN = JIRA ID<sup>*</sup>
   - [x] Unit tests coverage for changes (not needed for documentation changes)
   - [x] Commits follow "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)"
   - [x] Relevant documentation is updated including usage instructions.
   - [x] I will engage committers as explained in [Contribution Workflow Example](https://github.com/apache/airflow/blob/master/CONTRIBUTING.rst#contribution-workflow-example).
   
   <sup>*</sup> For document-only changes commit message can start with `[AIRFLOW-XXXX]`.
   
   ---
   In case of fundamental code change, Airflow Improvement Proposal ([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvements+Proposals)) is needed.
   In case of a new dependency, check compliance with the [ASF 3rd Party License Policy](https://www.apache.org/legal/resolved.html#category-x).
   In case of backwards incompatible changes please leave a note in [UPDATING.md](https://github.com/apache/airflow/blob/master/UPDATING.md).
   Read the [Pull Request Guidelines](https://github.com/apache/airflow/blob/master/CONTRIBUTING.rst#pull-request-guidelines) for more information.
   

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