Github user ScrapCodes commented on the pull request:
https://github.com/apache/spark/pull/5977#issuecomment-100102939
@JoshRosen Thanks for pointing out.
Until now I was in the impression of x.getClass is same as classOf[x].
```scala
scala> class A
defined class A
scala> new A
res0: A = A@2d38eb89
scala> classOf[A]
res1: Class[A] = class A
scala> res0.getClass
res2: Class[_ <: A] = class A
scala>
```
Thanks a lot for adding a test suite :). There is minor nit regarding
style, that we do not allow infix notations in scala syntax. LGTM otherwise.
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