Github user sun-rui commented on the pull request:
https://github.com/apache/spark/pull/9222#issuecomment-150377869
dfToCols is meant to be called from R side, it makes sense to test it in R.
Having a test case in R for it can test not only the logic in Scala, but also
helps to test other R Scala brige logic including serde. There is no test case
in Scala for SparkR for now, of course, we will add if really needed
test cases in R are at R/pkg/inst/tests
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