Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/7192#issuecomment-118355222
hi @chenghao-intel , IMO `SparkPlan` should only be executed at driver side
and no need to serialize and pass it to executor side. So in this PR, I'm
trying to remove all unnecessary `$out` references inside closure and remove
all `transient` inside `SparkPlan`.
cc @marmbrus @yhuai
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