Lee-W commented on code in PR #75499:
URL: https://github.com/apache/airflow/pull/75499#discussion_r4440530047
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airflow-core/src/airflow/partition_mappers/chain.py:
##########
@@ -66,8 +67,18 @@ def to_downstream(self, key: str) -> str | Iterable[str]:
return keys[0] if len(keys) == 1 else keys
def to_partition_date(self, downstream_key: str) -> datetime | None:
- # The last mapper in the chain formats the final downstream key, so it
owns the anchor.
- return self.mappers[-1].to_partition_date(downstream_key)
+ # A trailing IdentityMapper preserves the key, so the previous mapper
still owns the anchor.
+ mapper = self.mappers[-1]
+ index = len(self.mappers) - 1
+ while isinstance(mapper, IdentityMapper) and index > 0:
+ index -= 1
+ mapper = self.mappers[index]
+ try:
+ return mapper.to_partition_date(downstream_key)
+ except ValueError:
Review Comment:
None is incorrect in this case.
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