Github user gengliangwang commented on the issue: https://github.com/apache/spark/pull/22914 I prefer to just highlight the invalid output. E.g. ![image](https://user-images.githubusercontent.com/1097932/47831557-0e6ea800-ddcc-11e8-9fd1-c4d29f944c9d.png) ![image](https://user-images.githubusercontent.com/1097932/47831561-11699880-ddcc-11e8-9d83-20e49a0c517d.png)
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