Abacn opened a new issue, #37862:
URL: https://github.com/apache/beam/issues/37862
### What happened?
Found during working on #37855, this also happens on latest Beam version
(2.71)
A minimum example:
```
import typing
import apache_beam as beam
from apache_beam.testing.test_pipeline import TestPipeline
Tuple1 = typing.NamedTuple(
"Tuple1", [("id", int)])
Tuple2 = typing.NamedTuple(
"Tuple1", [("id", int), ("name", str)])
def generate(num: int):
for i in range(2):
yield (Tuple1(i), num)
yield (Tuple2(i, 'a'), num)
if __name__ == '__main__':
pipeline = TestPipeline(is_integration_test=False)
with pipeline as p:
result = (
p
| 'Create' >> beam.Create([i for i in range(2)])
| 'Generate' >> beam.ParDo(generate).with_output_types(
tuple[(Tuple1 | Tuple2), int])
| 'GBK' >> beam.GroupByKey()
| 'Print' >> beam.Map(print))
```
Output (actual):
```
(BeamSchema_4d393d46_1e51_4fa6_b8e4_5397335c352c(id=1), [0, 0, 1, 1])
(BeamSchema_4d393d46_1e51_4fa6_b8e4_5397335c352c(id=0), [0, 0, 1, 1])
```
Output (expected):
```
(BeamSchema_[A](id=1), [0, 1])
(BeamSchema_[A](id=0), [0, 1])
(BeamSchema_[B](id=1), [0, 1])
(BeamSchema_[B](id=0), [0, 1])
```
This could happen more likely for dataclass, when typehint is (A | B) where
dataclass B inherits from dataclass A.
### Issue Priority
Priority: 2 (default / most bugs should be filed as P2)
### Issue Components
- [x] Component: Python SDK
- [ ] Component: Java SDK
- [ ] Component: Go SDK
- [ ] Component: Typescript SDK
- [ ] Component: IO connector
- [ ] Component: Beam YAML
- [ ] Component: Beam examples
- [ ] Component: Beam playground
- [ ] Component: Beam katas
- [ ] Component: Website
- [ ] Component: Infrastructure
- [ ] Component: Spark Runner
- [ ] Component: Flink Runner
- [ ] Component: Samza Runner
- [ ] Component: Twister2 Runner
- [ ] Component: Hazelcast Jet Runner
- [ ] Component: Google Cloud Dataflow Runner
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