kaxil commented on pull request #17545:
URL: https://github.com/apache/airflow/pull/17545#issuecomment-897600884


   > can be known at the time of the DAG run whether or not to mark a task as 
skipped.
   
   That is not true in all cases though, DagRun creation does not mean your 
Task will run on the same day too for several reasons (parallelism, task is 
waiting for upstream task to complete and others) except ofcourse you are 
relying on "execution_date" and not actual "run date"/"start date"
   
   I do agree that there is advantage / optimization if you rely on 
execution_date and the scheduler can skip it but not otherwise.


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