Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/1134#issuecomment-54251873
Hi @YanjieGao, as I said #1127 this will be a great optimization to have
after we figure out how to choose join algorithms based on statistics. I think
we should close this issue for now and reopen once we have a design for this.
Thanks for working on it!
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