Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/2078
Hi @gallenvara, this issue cannot be easily solved. The `TypeInfo` check in
`UnionOperator` cannot be removed, because it prevents that incompatible
serializers are used at runtime. However, the equality check of the
`RowTypeInfo` is a bit too strict. `RowTypeInfo` is based on `CaseClassInfo`
which check for field types and names (which is fine for case classes).
However, for `Row` we only need to check for types. Actually, I think we can
remove the `fieldNames` parameter from the `RowTypeInfo` constructor and always
create default field names ("f0", "f1", ...) as done in some of the other
constructors.
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