Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/12382#issuecomment-210369151
If there's a built-in scalastyle rule for this, let's enable it, but
otherwise not sure it's worth building custom code to enforce it. If you've
found ways to look for more instances of this and found more classes of this
problem, OK open a new PR.
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