Github user sun-rui commented on the pull request:
https://github.com/apache/spark/pull/9222#issuecomment-151060081
@FRosner, I am not denying a unit test:). My point is that it seems not
necessary to add a Scala unit case for dfToCols, which is dedicated for SparkR
now and its logic is simple. Adding a R test case is fine for me, but it is a
plus but not compelling, as its functionality is covered by existing test cases
for collect().
As for private modifier, I could be wrong, forget it:)
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