Github user dbtsai commented on the pull request:
https://github.com/apache/spark/pull/7884#issuecomment-127771793
@jkbradley and @mengxr I had `weightCol` as empty as default in my local
branch. Sorry for confusion. This PR is meant to be WIP to see if we have
enough time to make it in 1.5, and not intended to be merged. Thanks.
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