uranusjr commented on a change in pull request #21715:
URL: https://github.com/apache/airflow/pull/21715#discussion_r816294334
##########
File path: airflow/timetables/interval.py
##########
@@ -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:
Also we need to document pretty thoroughly _why_ we need both functions.
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