Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/1134#issuecomment-46928292
Skew join optimization will be very helpful, but how do we know what are
skew join keys? By the way, the code will not take effect if you don't put the
strategy object into a give context, (e.g. SQLContext, HiveContext)
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