charlespnh opened a new issue, #35666:
URL: https://github.com/apache/beam/issues/35666
### What happened?
Run the following YAML pipeline:
```
pipeline:
transforms:
- type: Create
name: Create1
config:
elements:
- {'ride_id': '1',
'passenger_count': 1}
- {'ride_id': '2',
'passenger_count': 2}
- type: Create
name: Create2
config:
elements:
- {'ride_id': '3'}
- {'ride_id': '4'}
- type: Flatten
name: Flatten1
input:
- Create1
- Create2
- type: LogForTesting
name: LogForTesting
input: Flatten1
```
... gives the following result:
```
INFO:root:{"ride_id": "3"}
INFO:root:{"ride_id": "4"}
INFO:root:{"ride_id": "1"}
INFO:root:{"ride_id": "2"}
```
... But I'm expecting:
```
INFO:root:{"ride_id": "3"}
INFO:root:{"ride_id": "4"}
INFO:root:{"ride_id": "1", "passenger_count": 1}
INFO:root:{"ride_id": "2", "passenger_count": 2}
```
This is found on `apache_beam 2.66.0`. Tested with Python SDK on Beam
Playground and didn't see this issue of fields being dropped.
### Issue Priority
Priority: 2 (default / most bugs should be filed as P2)
### Issue Components
- [ ] Component: Python SDK
- [ ] Component: Java SDK
- [ ] Component: Go SDK
- [ ] Component: Typescript SDK
- [ ] Component: IO connector
- [x] 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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