Github user chenghao-intel commented on the pull request: https://github.com/apache/spark/pull/9097#issuecomment-153974261 cc/ @scwf @Sephiroth-Lin @zhichao-li has posted the benchmark result that we've done, but it's based on the fake data, I know you guys have requirement on this improvement, too, can you please test it with some real world cases?
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