wanlce commented on a change in pull request #21715:
URL: https://github.com/apache/airflow/pull/21715#discussion_r812673361
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File path: airflow/timetables/interval.py
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@@ -211,6 +217,17 @@ def _align(self, current: DateTime) -> DateTime:
return next_time
return current
+ def _prev_align(self, current: DateTime) -> DateTime:
+ """Get the prev scheduled time.
+
+ This is ``current - interval``, unless ``current`` falls right on the
+ interval boundary, when ``current`` is returned.
+ """
+ prev_time = self._get_prev(current)
+ if self._get_next(prev_time) != current:
+ return prev_time
+ return current
Review comment:
They are different ha
For self._prev_align()
- If current is at 1am, the return value is at midnight
For self._align()
- If current is at 1am, the return value is next midnight.
It is correct that `data_schedule_start` is equal to the `data_schedule_end`
of the previous one when no scheduling time changes. However, when the
scheduling time changes, The first `data_schedule_start` for a new schedule may
not be the same as the `data_schedule_end` before the schedule was changed
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