ashb commented on issue #5423: [AIRFLOW-3739] Remove start_date requirement on 
DAG
URL: https://github.com/apache/airflow/pull/5423#issuecomment-503033064
 
 
   Either we need a start-date and a schedule, or no schedule, (Or I guess the 
third option is schedule + existing dag runs, but that seems a bit much to 
check).
   
   Case 1: yup, adding that would be good
   
   Case 2: Guessing/inferring the schedule sounds risky. Do we really default 
it currently?
   
   Case 3: what else could it be? I guess if catchup was _also_ false then we 
could "guess" at "just run from the last complete interval, but that feels a 
bit error prone
   
   Setting the start_date but not the schedule interval isn't a _problem_ but 
may not be what people expect.

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