Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/7192#issuecomment-119673695
I think I would start by writing some code that looks at the actual size of
the closures that end up getting shipped for a variety of queries to see if
this is really a problem. Then if we are going to do this, we should have
tests that have thresholds on these sizes so that we don't just reintroduce all
the outer points with other work.
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