Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/11868#issuecomment-199957564
I spent a bit of time on this -- I'm actually not sure we want to change
this anymore, because Scala itsefl doesn't do this and users can always screw
up if they do field comparison themselves.
```
scala> Float.NaN == Double.NaN
res1: Boolean = false
```
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