ashb commented on code in PR #25788:
URL: https://github.com/apache/airflow/pull/25788#discussion_r948921825
##########
airflow/models/dagrun.py:
##########
@@ -1117,7 +1119,9 @@ def _revise_mapped_task_indexes(
new_indexes[task] = range(new_length)
missing_indexes: Dict[MappedOperator, Sequence[int]] =
defaultdict(list)
for k, v in existing_indexes.items():
- missing_indexes.update({k:
list(set(new_indexes[k]).difference(v))})
+ indexes = list(set(new_indexes[k]).difference(v))
+ if indexes:
+ missing_indexes.update({k: indexes})
Review Comment:
```suggestion
indexes = set(new_indexes[k]).difference(v)
if indexes:
missing_indexes[k] = list(indexes)
```
I think
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