Github user felixcheung commented on the pull request:
https://github.com/apache/spark/pull/9680#issuecomment-157268953
@sun-rui I updated it. I think it's a bit not as strongly typed as I'd like
but if I add `col2 = "Column"` to signature I get this error:
```
Error in match.call(definition, call, expand.dots, envir) :
unused argument (col2 = c("Column", ""))
```
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