Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/9680#issuecomment-162258164
LGTM. @felixcheung I think the current resolution of not adding `cor` until
we can support it is fine by me. Its better to not mask existing functions
unless we can match existing functionality.
Merging this to master, branch-1.6
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