Proto-Parquet cannot write a schema with an empty group

[asfimport]

This is valid protobuf:

 

message Something {
    EmptyMessage outerEmptyMessage = 1;
}

message EmptyMessage {
}

However when we try to convert this to Parquet we get:

org.apache.parquet.schema.InvalidSchemaException: Cannot write a schema with an empty group: optional group outerEmptyMessage = 1 {
}

Is this a limitation of the Parquet format, or just a bug?

If the former, can we break earlier when generating the schema out of Protobuf, and not when trying to write the content to the already generated schema?

 

Reporter: André Pinto

_{Note: This issue was originally created as PARQUET-1240. Please see the migration documentation for further details.}

[d3m3vilurr]

Can I ask any update this issue?