[GitHub] [airflow] xinbinhuang edited a comment on pull request #15142: Add support for labelling DAG edges (WIP)

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xinbinhuang edited a comment on pull request #15142:
URL: https://github.com/apache/airflow/pull/15142#issuecomment-812326424


   How about `task1 >> "this is a label" | task2`? This is the exact opposite of the Beam Python SDK [example here](https://beam.apache.org/documentation/sdks/python-streaming/). 
   
   Though I am a bit hesitant to introduce another special operator for Airflow, I think it's still better to introduce a `Label` inheriting from `TaskMixin` for these 2 reasons:
   
   - Conceptually, label and task should not be treated the same. The label is metadata but the task is a task. They are different in both UI and execution.
   - In general, I don't like the *explicit* import of UI components in DAG code. I think DAG code should focus on execution/dependency logic
   
   > If we ever want to add edge information beyond just a label (e.g. add a longer description), it means we have to go back to this pattern
   
   Can you give an example of a long description that has to use `Label` for but not otherwise?


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