[GitHub] [airflow] uranusjr commented on a change in pull request #18786: Docs: Move part of timetable guide to concepts

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uranusjr commented on a change in pull request #18786:
URL: https://github.com/apache/airflow/pull/18786#discussion_r723768339



##########
File path: docs/apache-airflow/dag-run.rst
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@@ -22,7 +22,8 @@ A DAG Run is an object representing an instantiation of the DAG in time.
 Each DAG may or may not have a schedule, which informs how DAG Runs are
 created. ``schedule_interval`` is defined as a DAG argument, which can be passed a
 `cron expression <https://en.wikipedia.org/wiki/Cron#CRON_expression>`_ as
-a ``str``, a ``datetime.timedelta`` object, or one of the following cron "presets".
+a ``str``, a ``datetime.timedelta`` object, a ``Timetable`` object,
+or one of the following cron "presets".

Review comment:
       `schedule_interval` only accepts `str` (cron expression), `timedelta`, and `None`. A timetable object needs to be passed to the `timetable` argument instead.




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