Convert camelCase to snake_case when saving Dataframe/Dataset to parquet?

[Mike Wheeler]

Hi Spark User,

For Scala case class, we usually use camelCase (carType) for member fields.
However, many data system use snake_case (car_type) for column names. When
saving a Dataset of case class to parquet, is there any way to
automatically convert camelCase to snake_case (carType -> car_type)?

Thanks,

Mike