Github user srowen commented on the pull request: https://github.com/apache/spark/pull/3874#issuecomment-68789982 Although further creep of the unshading-of-the-shading feels risky, it seems to resolve a problem, and is in principle OK on the same grounds that unshading `Optional` is. I'm still puzzled about why using Guava 14 isn't working but wouldn't argue with solving a problem this way.
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