uranusjr commented on a change in pull request #17414:
URL: https://github.com/apache/airflow/pull/17414#discussion_r695662217
##########
File path: airflow/models/dag.py
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@@ -92,11 +91,34 @@
log = logging.getLogger(__name__)
-ScheduleInterval = Union[str, timedelta, relativedelta]
DEFAULT_VIEW_PRESETS = ['tree', 'graph', 'duration', 'gantt', 'landing_times']
ORIENTATION_PRESETS = ['LR', 'TB', 'RL', 'BT']
+ScheduleIntervalArgNotSet = type("ScheduleIntervalArgNotSet", (), {})
+
DagStateChangeCallback = Callable[[Context], None]
+ScheduleInterval = Union[str, timedelta, relativedelta]
+ScheduleIntervalArg = Union[ScheduleInterval, None,
Type[ScheduleIntervalArgNotSet]]
+
+
+# Backward compatibility: If neither schedule_interval nor timetable is
+# *provided by the user*, default to a one-day interval.
+DEFAULT_SCHEDULE_INTERVAL = timedelta(days=1)
Review comment:
It was `timedelta(days=1)` before this PR; I don’t know if it’s changed
at some point.
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