robertwb commented on a change in pull request #16761:
URL: https://github.com/apache/beam/pull/16761#discussion_r801954077
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File path: sdks/python/apache_beam/typehints/trivial_inference.py
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@@ -227,6 +227,9 @@ def element_type(hint):
return hint.inner_type
elif isinstance(hint, typehints.TupleHint.TupleConstraint):
return typehints.Union[hint.tuple_types]
+ elif isinstance(hint,
+ typehints.UnionHint.UnionConstraint) and not
hint.union_types:
Review comment:
The empty union is a type that can never happen; we want to propagate
that to its (non-existent) "element" type.
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