Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/4199#issuecomment-72400547
I don't think that I agree with this change. In general it is always safe
to do a shuffle join where as a broadcast join could possible cause the driver
to OOM. However, I'm worried that this change will make us faster for some
workloads but possibly also unstable.
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