Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/7474#issuecomment-128130659
@yanboliang let's close this for now. I'm not sure if it is super useful to
have this API, and it is also pretty hard to get right in a distributed setting
(i.e. the two dataframes can have inconsistent number of rows).
We can revisit this if there is stronger demand.
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