milton0825 edited a comment on issue #5279: [AIRFLOW-4509] SubDagOperator using scheduler instead of backfill URL: https://github.com/apache/airflow/pull/5279#issuecomment-496740218 @ashb correct me if I am wrong. I think that implies that only parent DAGs can have `DagRun` and subdag is just used as an abstraction for visualization only. I would imagine that we still need to track the progress of subdag somewhere and `DagRun` would be a a good place since it is the abstraction built for this purpose. Of course the downside of maintaining multiple `DagRun` 's can complicate the codebase and can be hard to keep all `DagRun` s consistent. I would like to hear more about your thoughts on this. But I agree with you that this PR can be the first step as it does not involve too many changes...
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