Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/10513#issuecomment-168158788
My theory was that it makes it more compatible with Java 8 Optional. Later,
moving to its implementation is a smaller change. We're taking the bigger
change now. Or at least that was the motivation.
Another possibility is to add the Guava work-alike methods and deprecate
them. Later they'd be removed I guess when Java 8 Optional gets used. I liked
that less since it still just half of the breaking change farther down the
road, when a major release seems like the time to do as much of the breaking as
possible.
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