dabla commented on code in PR #62922:
URL: https://github.com/apache/airflow/pull/62922#discussion_r3628685172
##########
task-sdk/src/airflow/sdk/execution_time/lazy_sequence.py:
##########
@@ -166,6 +169,80 @@ def __getitem__(self, key: int | slice) -> T | Sequence[T]:
return XCom.deserialize_value(_XComWrapper(msg.root))
+class XComIterable(Sequence):
+ """An iterable that lazily fetches XCom values one by one instead of
loading all at once."""
+
+ def __init__(self, task_id: str, dag_id: str, run_id: str, length: int,
map_index: int | None = None):
+ self.task_id = task_id
+ self.dag_id = dag_id
+ self.run_id = run_id
+ self.length = length
+ self.map_index = map_index
+
+ def __iter__(self) -> Iterator:
+ return _XComIterator(self)
+
+ def __len__(self) -> int:
+ return self.length
+
+ @overload
+ def __getitem__(self, key: int) -> Any: ...
+
+ @overload
+ def __getitem__(self, key: slice) -> Sequence[Any]: ...
+
+ def __getitem__(self, key: int | slice) -> Any | Sequence[Any]:
+ """Allow direct indexing so this works like a sequence."""
+ if isinstance(key, slice):
+ start, stop, step = key.indices(len(self))
+ return [self[i] for i in range(start, stop, step)]
Review Comment:
@kaxil Wouldn't it be better to do this in a separate
[PR](https://github.com/apache/airflow/pull/70223), so we already have the XCom
FastAPI route ready so once merged, we can use it here to not overwhelm this PR?
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