uranusjr opened a new pull request, #46451:
URL: https://github.com/apache/airflow/pull/46451

   This adds a new `MultipleCronTriggerTimetable` that takes multiple cron 
expressions, and schedule runs whenever the time matches at least one of the 
expressions. Internally, this just uses `CronTriggerTimetable` and check which 
instance gives the closest “next” run.
   
   I specifically choose `CronTriggerTimetable`, not the more traditional 
`CronDataIntervalTimetable`, since the latter needs to have data interval 
logic, and it is very unclear how data interval should be calculated when more 
than one cron expression is involved.


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