Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/3874#issuecomment-68751824
Damn, exposing `Optional` in the API turned out to be a minefield... I see
the problem and I don't see a good solution other than adding `Function` to the
list of exclusions.
That being said, I think only `Function` should be added. The
[source](https://code.google.com/p/guava-libraries/source/browse/guava/src/com/google/common/base/Function.java?name=master)
indicates it has no references to other types, so hopefully it shouldn't cause
any other issues...
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