Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/10513#issuecomment-168534205
No matter what, there's a break now -- not even source-compatible. In for a
penny, in for a pound, if it has a future benefit? but I agree it's unlikely to
actually switch to the Java 8 `Optional` as it's yet another
source-incompatible change. I think it's either use Java 8 in Spark 2.x, and
then really use `java.util.Optional`, or else go with the hybrid solution where
the new class tries to implement both the Guava and Java 8 API.
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