aka-peter opened a new issue, #3039:
URL: https://github.com/apache/parquet-java/issues/3039
### Describe the bug, including details regarding any error messages,
version, and platform.
When unwrap is enabled all fields of the `TestProto3.OneOfTestMessage` will
be required.
```
message TestProto3.OneOfTestMessage {
required int32 first = 1;
required int32 second = 2;
}
```
https://github.com/apache/parquet-java/blob/73a4430af6c40f8eb246ad4911eb6d103c9a2abe/parquet-protobuf/src/test/resources/TestProto3.proto#L116
This will never work but tests are missing for unwrap of
`TestProto3.OneOfTestMessage`
The required repetition is added here:
https://github.com/apache/parquet-java/blob/73a4430af6c40f8eb246ad4911eb6d103c9a2abe/parquet-protobuf/src/main/java/org/apache/parquet/proto/ProtoSchemaConverter.java#L278
This could be caught early by adding `withValidation(true)` here:
https://github.com/apache/parquet-java/blob/73a4430af6c40f8eb246ad4911eb6d103c9a2abe/parquet-protobuf/src/test/java/org/apache/parquet/proto/TestUtils.java#L221
If validation is disabled it will fail when trying to read one of the
non-existing fields in the `oneof`.
Is there really a need for setting all primitive fields in unwrap to
required?
### Component(s)
_No response_
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