Lee-W commented on code in PR #67537:
URL: https://github.com/apache/airflow/pull/67537#discussion_r3382020336
##########
airflow-core/src/airflow/models/backfill.py:
##########
@@ -266,6 +298,51 @@ def _get_dag_run_no_create_reason(dr, reprocess_behavior:
ReprocessBehavior) ->
return non_create_reason
+def _validate_partition_window(
+ partition_date_start: datetime | None,
+ partition_date_end: datetime | None,
+) -> None:
+ """Raise ``InvalidPartitionWindow`` when start is strictly after end."""
+ if (
+ partition_date_start is not None
+ and partition_date_end is not None
+ and partition_date_start.date() > partition_date_end.date()
+ ):
+ raise InvalidPartitionWindow(
+ f"partition_date_start ({partition_date_start.date()}) must not be
after "
+ f"partition_date_end ({partition_date_end.date()})."
+ )
+
+
+def _resolve_backfill_window(
Review Comment:
I redesigned this rather than patching it: there's no longer a separate
partition-selector path or `from_date`/`to_date` rejection.Backfill now
auto-detects a partitioned timetable and treats the existing `--from-date` /
`--to-date` as the partition-date range (one run per partition), so the API/UI
just work — no 500. Added API, model, and timetable tests for the partitioned
case.
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