GitHub user Jefffrey closed the discussion with a comment: Parquet logical type 
may be none even if converted type is set?

I think this explains it

https://github.com/apache/arrow-rs/blob/12091af35e5070dae33e86fbe988d9319521cd16/parquet/src/basic.rs#L1197-L1203

Can't speak on the C++ implementation, though it looks like they do it like this

https://github.com/apache/arrow/blob/deed9c0d99b33be112f9931ec92f4df65c75fc43/cpp/src/parquet/types.cc#L462-L532

GitHub link: 
https://github.com/apache/arrow-rs/discussions/6404#discussioncomment-17819461

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