damccorm opened a new issue, #19903:
URL: https://github.com/apache/beam/issues/19903
When inferring PCollection element types, merge Unions of identically-sized
Tuples:
Union[Tuple[a, b], Tuple[c, d]] =\> Tuple[Union[a, c], Union[b, d]]
cc: [~robertwb]
Example:
```
def fn(element: Tuple[str, Any]):
....
p | Create([('a', None), ('b', None)] + [('c', 1), ('d',
3)]) | ParDo(fn)
```
This pipeline will fail with something like:
```
apache_beam.typehints.decorators.TypeCheckError: Type hint violation for
'ParDo': requires Tuple[str,
Any] but got Union[Tuple[str, NoneType], Tuple[str, int]] for element
```
In test form:
```
def test_union_of_tuple(self):
self.assertCompatible(
typehints.Tuple[str, typehints.Any],
typehints.Union[typehints.Tuple[str, type(None)],
typehints.Tuple[str,
int]])
```
Imported from Jira
[BEAM-8464](https://issues.apache.org/jira/browse/BEAM-8464). Original Jira may
contain additional context.
Reported by: udim.
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