jedcunningham commented on code in PR #22849:
URL: https://github.com/apache/airflow/pull/22849#discussion_r846639474
##########
airflow/models/taskinstance.py:
##########
@@ -295,6 +299,71 @@ def clear_task_instances(
dr.start_date = None
+class _LazyXComAccessIterator(collections.abc.Iterator):
+ __slots__ = ['_cm', '_it']
+
+ def __init__(self, cm: ContextManager[Query]):
+ self._cm = cm
+ self._it = None
+
+ def __del__(self):
+ if self._it:
+ self._cm.__exit__(None, None, None)
+
+ def __iter__(self):
+ return self
+
+ def __next__(self):
+ if not self._it:
+ self._it = iter(self._cm.__enter__())
+ return XCom.deserialize_value(next(self._it))
+
+
+class _LazyXComAccess(collections.abc.Sequence):
+ """Wrapper to lazily pull XCom with a sequence-like interface.
+
+ Note that since the session bound to the parent query may have died when we
+ actually access the sequence's content, we must a new fresh session
Review Comment:
```suggestion
actually access the sequence's content, we must create a new session
```
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