Incorrect Repeated Field Schema Inference

[tustvold]

Describe the bug

The schema inference logic in parquet does not infer the correct nullability for nested types.

For example

let message_type = "
message test_schema {
  OPTIONAL INT32 leaf1;
  REPEATED GROUP outerGroup {
    OPTIONAL INT32 leaf2;
    REPEATED GROUP innerGroup {
      OPTIONAL INT32 leaf3;
    }
  }
}
";
let parquet_group_type = parse_message_type(message_type).unwrap();
let parquet_schema = SchemaDescriptor::new(Arc::new(parquet_group_type));
let converted_arrow_schema =
parquet_to_arrow_schema(&parquet_schema, None).unwrap();

Will infer innerGroup and outerGroup as nullable lists with nullable elements, when they are neither.

To Reproduce

See test

Expected behavior

The nullability should be inferred correctly

Additional context

This has likely been hidden by the lack of support for repeated fields - #1680