Github user JoshRosen commented on the pull request: https://github.com/apache/spark/pull/8026#issuecomment-149785524 @chenghao-intel, thanks a bunch for updating this; the current version of this patch is a lot easier to understand and I'm happy with how clean the code turned out. I left only minor style / clarity comments, which I don't mind addressing myself on merge if you're too busy. If you don't mind, though, one more round of quick updates to address my comments would be appreciated. Anyhow, the technical changes here LGTM.
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