Currently when you write parquet files via the sas libname engine the parquet types are fully determined by the informat only. That is to say if you have a numeric variable with a datetime20. format and no informat it will be written to the parquet file as a double.
The feature request is that if no informats are specified SAS should use sensible default types based on the format. It is very intuitive that a datetime20. format column should be written as a timestamp thus users should not have to be burdened for defining informat types for what should be obvious conversions.
