mai-nakagawa opened a new pull request, #23662:
URL: https://github.com/apache/airflow/pull/23662

   Relates #15432 
   
   I also have gone through the above discussion and the related documents 
introduced there:
   - [AIP-39 Richer 
scheduler_interval](https://cwiki.apache.org/confluence/display/AIRFLOW/AIP-39+Richer+scheduler_interval)
   - [Scoping out a new feature for 2.1: improving 
schedule_interval](https://lists.apache.org/thread.html/rb4e004e68574e5fb77ee5b51f4fd5bfb4b3392d884c178bc767681bf%40%3Cdev.airflow.apache.org%3E)
   - [[DISCUSS][AIP-39] Richer (and pluggable) schedule_interval on 
DAGs](https://lists.apache.org/thread.html/rf8eeb06493681f48dc9e82ce605a9c3a930cfee0b4ca19462a4e55b3%40%3Cdev.airflow.apache.org%3E)
   
   I agree with the idea of "data intervals", however, the default behavior of 
[`CronDataIntervalTimetable`](https://github.com/apache/airflow/blob/2.2.5/airflow/timetables/interval.py#L116)
 is a little bit confusing - a DAG Run is triggered immediately after the DAG 
is enabled (unpaused), unlike normal cron's behavior.
   
   Hence I'd like to add another cron timetable which starts a DAG Run at the 
start of the period.


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