ashb commented on a change in pull request #21815:
URL: https://github.com/apache/airflow/pull/21815#discussion_r816636698
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File path: airflow/models/mappedoperator.py
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@@ -284,7 +285,10 @@ def get_serialized_fields(cls):
@staticmethod
@cache
def deps_for(operator_class: Type["BaseOperator"]) -> FrozenSet[BaseTIDep]:
- return operator_class.deps | {MappedTaskIsExpanded()}
+ operator_deps = operator_class.deps
+ if not isinstance(operator_deps, collections.abc.Set):
+ raise UnmappableOperator(f"cannot map operator;
f{operator_class}.deps must be a set")
Review comment:
"deps must be defined as a class-level variable, not a property"?
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