Github user yanboliang commented on the pull request: https://github.com/apache/spark/pull/11267#issuecomment-186993289 @shivaram Several R packages have similar function such as [first](http://www.inside-r.org/packages/cran/pastecs/docs/first), [aggregate](http://www.inside-r.org/r-doc/stats/aggregate), etc. Users need this feature in R and did some [workaround](http://stackoverflow.com/questions/28799753/how-to-select-the-last-one-test-without-na-in-r).
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