Github user sksamuel commented on the pull request:
https://github.com/apache/spark/pull/5376#issuecomment-90662827
In general Hotspot is good at optimizing away unneeded allocations but in
this case, since you're invoking a method on the allocated object, you're
actually asking hotspot to realize that the method is a delegate and the
delegation call can be flattened (I hestitate to use the word inlined so we
don't go off topic on inlining of local functions which hotspot does). I don't
think Hotspot can do this currently, but would be impressed to learn otherwise.
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