Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/19706
Thanks for review @felixcheung. BTW, looks AppVeyor was failed by a
different reason .. ?
```
> packageVersion('knitr'); packageVersion('rmarkdown');
packageVersion('testthat'); packageVersion('e1071'); packageVersion('survival')
Error in packageVersion("knitr") : package 'knitr' not found
Execution halted
Command exited with code 1
```
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