Github user cloud-fan commented on the issue: https://github.com/apache/spark/pull/23204 according to https://github.com/apache/spark/pull/23214#issuecomment-443999282 , the hash join metrics is wrongly implemented. I think it's fine to revert it and re-implement it later. @JkSelf can you address the comments and only revert the hash join part? thanks!
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