Parquet Output Format Enhancements for Date and DateTime Columns

Parquet output format converts Date and DateTime columns to date/time types supported by Parquet, instead of writing them as raw numbers. DateTime becomes DateTime64(3) (was: UInt32); setting output_format_parquet_datetime_as_uint32 brings back the old behavior. Date becomes Date32 (was: UInt16). #70950 (Michael Kolupaev).