Github user yinxusen commented on the pull request:
https://github.com/apache/spark/pull/10772#issuecomment-172148624
@jkbradley I have changed the fix. However, here is a little tricky. If a
developer wants to convert an `Array[Array[Int]]` or an
`Array[Array[Array[Int]]]`, etc. , it may still have problem. But here, it's
non-trivial to check the nested structure.
For complext structure, an example from current code is in
[VectorIndexer](https://github.com/apache/spark/blob/v1.6.0/mllib/src/main/scala/org/apache/spark/ml/feature/VectorIndexer.scala#L266).
Do you have any recommendations for it? How about we add an assertion in the
above code:
```scala
case Array[Array[_]] => throw new XXXException("You need transform nested
array into Java list yourself")
```
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