Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/17682 @guoxiaolongzte, I just tested the backquotes on Windows with Chrome as below: ![2017-04-21 4 22 07](https://cloud.githubusercontent.com/assets/6477701/25267195/d123bb28-26ae-11e7-823e-405b3665afdd.png) ![2017-04-21 4 22 14](https://cloud.githubusercontent.com/assets/6477701/25267194/d1234cc4-26ae-11e7-9058-a56fba2765c1.png) It is a backquote `` ` `` not a single-quote `'`. Could you try again? I see you made many PRs and I would like them to be more readable.
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