Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/7356#issuecomment-122122047
Hmm I think the scala API having two arguments makes an interesting case --
I did not notice that. What does the Python API do ?
One thing about the `createColumnFunction` things is that they are hard to
document with roxygen. We should create a separate JIRA to discuss this.
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