Several issues we need to address before release 1.3
- Do we want to make all classes in org.apache.spark.sql.types.dataTypes.scala public? Seems we do not need to make those abstract classes public.
- Seems NativeType is not a very clear and useful concept. Should we just remove it?
- We need to Stabilize the type hierarchy of our data types. Seems StringType and Decimal Type should not be primitive types.