Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/8908#issuecomment-143066210
You can run `dev/lint-r` in your tree and it should do the style checks.
Also the jenkins log has the error at the end
```
R/DataFrame.R:1867:69: style: Trailing whitespace is superfluous.
setMethod(f = "as.data.frame", signature = "DataFrame", definition =
```
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