Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/511#issuecomment-41356364
@marmbrus @AndreSchumacher do we really want a SparkConf option for this?
I'd rather minimize the number of options and add rules in the optimizer later
to decide when to do this. These kind of options are esoteric and very hard for
users to configure.
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