Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/7192#issuecomment-118390526
@cloud-fan not sure if I follow. The `$out` reference is generally
something pulled into the closure by the compiler, not something we can avoid.
In fact, closure cleaning is expensive even if we don't modify any pointers
because we still have to traverse the ASM tree.
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