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Antoine PitrouMicah Kornfield
ab435daa89e
Antoine Pitrou authored and Micah Kornfield committed 5216e044cef
PARQUET-1990: [C++] Refuse to write ConvertedType::NA

ConvertedType::NA corresponds to an invalid converted type that was once added to the Parquet spec:
https://github.com/apache/parquet-format/pull/45
but then quickly removed in favour of the Null logical type:
https://github.com/apache/parquet-format/pull/51

Unfortunately, Parquet C++ could still in some cases emit the unofficial converted type.

Also remove the confusingly-named LogicalType::Unknown, while "UNKNOWN" in the Thrift specification points to LogicalType::Null.

Closes #9863 from pitrou/PARQUET-1990-invalid-converted-type

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Micah Kornfield <emkornfield@gmail.com>