Parquet logical type may be none even if converted type is set?

[jp0317]

when converted type is set but logical type is not, currently the logical type in basic type info will be none. I noticed that in C++ implementation logical type can be created from converted type, e.g., here. Is this behavior inconsistency intended?

[Jefffrey]

I think this explains it

arrow-rs/parquet/src/basic.rs

Lines 1197 to 1203 in 12091af

	// LogicalType <=> ConvertedType conversion
	// Note: To prevent type loss when converting from ConvertedType to LogicalType,
	// the conversion from ConvertedType -> LogicalType is not implemented.
	// Such type loss includes:
	// - Not knowing the decimal scale and precision of ConvertedType
	// - Time and timestamp nanosecond precision, that is not supported in ConvertedType.

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