Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/8705#issuecomment-140133705
Found two possible sources of flakiness:
1. For double and float, `NaN == NaN` is always `false`
2. `checkAnswer` doesn't handle `Map[K, V]` properly. For example:
```
scala> Map(1 -> 2, 2 -> 1).toString
res0: String = Map(1 -> 2, 2 -> 1)
scala> Map(2 -> 1, 1 -> 2).toString
res1: String = Map(2 -> 1, 1 -> 2)
```
We can't rely on `toString` to compare `Map` instances.
Need to update `checkAnswer` to special case `NaN` and `Map[K, V]`.
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