Github user JoshRosen commented on the pull request: https://github.com/apache/spark/pull/11140#issuecomment-184512589 No comment on the contents of this PR (since I haven't looked at them), but I did want to note that I think that the pull request description is a little thin here. Could you add a concise summary of the changes here, their impact on the code, and motivation for why we're doing this? This helps reviewers / readers know what to focus on and also helps future readers by allowing them to understand the gist of this change without having to read the entire JIRA / discussion.
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