Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/18481#discussion_r125110360
--- Diff: R/pkg/R/functions.R ---
@@ -200,6 +200,31 @@ NULL
#' head(select(tmp, sort_array(tmp$v1, asc = FALSE)))}
NULL
+#' Window functions for Column operations
+#'
+#' Window functions defined for \code{Column}.
+#'
+#' @param x In \code{lag} and \code{lead}, it is the column as a character
string or a Column
+#' to compute on. In \code{ntile}, it is the number of ntile
groups.
+#' @param offset In \code{lag}, the number of rows back from the current
row from which to obtain
+#' a value. In \code{lead}, the number of rows after the
current row from which to
+#' obtain a value. If not specified, the default is 1.
+#' @param ... additional argument(s).
+#' @name column_window_functions
+#' @rdname column_window_functions
+#' @family window functions
+#' @examples
+#' \dontrun{
+#' # Dataframe used throughout this doc
+#' df <- createDataFrame(cbind(model = rownames(mtcars), mtcars))
+#' ws <- orderBy(windowPartitionBy("am"), "hp")
+#' tmp <- mutate(df, dist = over(cume_dist(), ws), dense_rank =
over(dense_rank(), ws),
--- End diff --
is this comment still useful, or obvious without it?
```
#' # Get ntile group id (1-4) for hp
```
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