Github user squito commented on the pull request: https://github.com/apache/spark/pull/4055#issuecomment-113297759 Hi @suyanNone I'm still trying to understand this. Your high-level description of the problem makes sense, but I'm confused by the test case. I put in a few comments, maybe I just need a little more explanation. It may be related to the work I've been doing on SPARK-7308, though I still need to think about more. In any case thanks for your work on it and sorry if I need some time to think it through & more detailed explanation
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