Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/1074#issuecomment-46076251
This test is failing because you made the `TreeNode` an inner class. An
inner class is actually just syntactic sugar done by the compiler where there
is an extra implicit constructor parameter to the class for the outer object.
As a result, the contract that all of the argument to the `TreeNode`'s
constructor are either in `productIterator` or `otherCopyArgs` is broken.
Here's a fix: https://github.com/concretevitamin/spark/pull/1
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