Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18009#discussion_r118209944
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/DatasetPrimitiveSuite.scala ---
@@ -28,6 +28,8 @@ case class SeqClass(s: Seq[Int])
case class ListClass(l: List[Int])
+case class JListClass(l: java.util.List[Int])
--- End diff --
This is not supported intentionally. If we want to support java classes and
scala classes mixedly, we should unify the `ScalaRelfection` and
`JavaTypeInference`, which is a lot of effort.
For now I think it's more important to completely support specific
collections type in scala, and then try to unify the `ScalaRelfection` and
`JavaTypeInference`.
what do you think?
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