Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/18481#discussion_r125154702
--- Diff: R/pkg/R/functions.R ---
@@ -2844,27 +2872,16 @@ setMethod("ifelse",
###################### Window functions######################
-#' cume_dist
-#'
-#' Window function: returns the cumulative distribution of values within a
window partition,
-#' i.e. the fraction of rows that are below the current row.
-#'
-#' N = total number of rows in the partition
-#' cume_dist(x) = number of values before (and including) x / N
-#'
+#' @details
+#' \code{cume_dist}: Returns the cumulative distribution of values within
a window partition,
+#' i.e. the fraction of rows that are below the current row:
+#' number of values before (and including) x / total number of rows in the
partition.
#' This is equivalent to the \code{CUME_DIST} function in SQL.
+#' This should be used with no argument.
--- End diff --
in the earlier PR, you have `The method should be used with no argument.`
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