Major Description
When you define UDTs based on hierarchical traits UDFs disregard the type hierarchy:
E.g. I have 2 UDTs based on 2 hierarchical traits. I then define 2 UDFs: The first one returns the derived type, the second takes the base type. This results in an error, although i believe it should be feasible:
(...)cannot resolve 'UDF(UDF(22))' due to data type mismatch: argument 1 requires exampleBaseType type, however, 'UDF(22)' is of exampleFirstSubType type.
The reason is that DataType defines
override private[sql] def acceptsType(dataType: DataType) =
this.getClass == dataType.getClass
However I believe it should be:
override private[sql] def acceptsType(dataType: DataType) = dataType match {
case other: UserDefinedType[_] =>
this.getClass == other.getClass || this.userClass.isAssignableFrom(other.userClass)
case _ => false
}
