Currently, in ProtoParquetWriter there's not any support for extended protobuf messages. An attempt to write a protobuf message with extension either:
- Results in an uninformative error like this:
- Results in a data corruption, if an extension type is compatible with a base field type with a corresponding index.
Imo there are two possible solutions:
1. Ignore extension fields.
2. When an extension field is detected in a message, throw an informative error.