Major Description
SPARK-13894 changed the return type of range from Dataset[Row] to Dataset[Long]. The problem is that due to https://issues.scala-lang.org/browse/SI-4388, Scala compiles primitive types in generics into just Object, i.e. range at bytecode level now just returns Dataset[Object]. This is really bad for Java users because they are losing type safety and also need to add a type cast every time they use range.
Talked to retronym who suggested the best approach is to return Dataset[java.lang.Long]. The small downside is that when Scala users want to explicitly type a closure used on the dataset returned by range, they would need to use java.lang.Long instead of the Scala Long.
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