Github user sun-rui commented on the pull request:
https://github.com/apache/spark/pull/8961#issuecomment-144976347
@felixcheung, could you verify that your PR works when there are columns
more than 2? for example, select(df, c("c1", "c2", "c3")). I suspect that it
does not work. Note that the signature of the Scala select:
select(col:String, cols: String*)
If we want to support the case where the parameter col is a vector, I think:
1. extract the col[[1]]
2. merge the remaining col[2:length(col)] and the possible ... varargs.
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