ashb opened a new issue, #22833:
URL: https://github.com/apache/airflow/issues/22833
This dag
```python
with DAG(dag_id="simple_mapping", start_date=pendulum.DateTime(2022, 4, 6),
catchup=True) as d3:
@task(email='[email protected]')
def add_one(x: int):
return x + 1
two_three_four = add_one.expand(x=[1, 2, 3])
three_four_five = add_one.expand(x=one_two_three)
```
Fails with this error:
```
File "/home/ash/code/airflow/airflow/airflow/models/taskinstance.py", line
2239, in _record_task_map_for_downstreams
raise UnmappableXComTypePushed(value)
airflow.exceptions.UnmappableXComTypePushed: unmappable return type 'int'
```
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