Reynold Xin created SPARK-14063:
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Summary: SQLContext.range should return Dataset[java.lang.Long]
Key: SPARK-14063
URL: https://issues.apache.org/jira/browse/SPARK-14063
Project: Spark
Issue Type: Sub-task
Components: SQL
Reporter: Reynold Xin
Assignee: Reynold Xin
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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