Github user scwf commented on the pull request:
https://github.com/apache/spark/pull/7417#issuecomment-138037270
@zsxwing it is definitely putting the small table in the left side of
'RDD.cartesian` improve the performance. you can have a simple test that do
cartesian with a big data set and a small data set. the performance of putting
the small data set right is much much worse.
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