Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/9358#issuecomment-153335332
cc @yhuai @marmbrus , according to the jenkins result, scala method which
returns generic array will return `Object` at java side, `DataFrame.collect`
returns `Array[Row]` and has no problem.
The reason is that: in scala `Array[Int]`, `Array[String]` are just `Array`
with type parameter, however, at java side, `int[]` and `String[]` is different
type, and there is exactly one supertype of them: `java.lang.Object`.
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