Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/2455#issuecomment-57874204
@erikerlandson I didn't check the test code. I will try to find another
time to make a pass on the test. The implementation looks good to me except
minor inline comments. Could you create a JIRA for `.drop(...)` in sampling and
link it to the upstream Scala JIRA? So we will remember to update it later.
Thanks!
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