Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/18371#discussion_r124454234
--- Diff: R/pkg/R/functions.R ---
@@ -41,14 +41,21 @@ NULL
#' @param x Column to compute on. In \code{shiftLeft}, \code{shiftRight}
and \code{shiftRightUnsigned},
#' this is the number of bits to shift.
#' @param y Column to compute on.
-#' @param ... additional argument(s). For example, it could be used to
pass additional Columns.
--- End diff --
we don't have math func that takes more than 2 columns?
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