tvalentyn opened a new issue, #24704:
URL: https://github.com/apache/beam/issues/24704
### What would you like to happen?
CoGroupByKey produces Dict[K, Union[...]], which is narrower than TypedDict.
If the user follows the CoGroupByKey with a ParDo where the function takes
TypeDict as input, then the type check in Beam fails.
Users having types like:
```
myTypeDict = TypedDict(
'myTypeDict', {
'field_1': List[Field1Type],
'field_2': List[Field2Type],
})
```
are using less specific hints like `myLessSpecificDict = Dict(str,
Union[List[Field1Type], List[Field2Type]])` in order to satisfy beams typing.
We could a first-class typehint TypeDict, which may be easier once we
deprecate Python 3.7.
### Issue Priority
Priority: 3 (nice-to-have improvement)
### Issue Components
- [X] Component: Python SDK
- [ ] Component: Java SDK
- [ ] Component: Go SDK
- [ ] Component: Typescript SDK
- [ ] Component: IO connector
- [ ] Component: Beam examples
- [ ] Component: Beam playground
- [ ] Component: Beam katas
- [ ] Component: Website
- [ ] 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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