[jira] [Created] (SPARK-14063) SQLContext.range should return Dataset[java.lang.Long]

["Reynold Xin (JIRA)" <ji...@apache.org>]

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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