Github user sun-rui commented on a diff in the pull request:
https://github.com/apache/spark/pull/10220#discussion_r61376989
--- Diff: R/pkg/R/DataFrame.R ---
@@ -1426,11 +1426,11 @@ setMethod("withColumn",
#' Mutate
#'
-#' Return a new SparkDataFrame with the specified columns added.
+#' Return a new SparkDataFrame with the specified columns added or
replaced.
#'
#' @param .data A SparkDataFrame
#' @param col a named argument of the form name = col
-#' @return A new SparkDataFrame with the new columns added.
+#' @return A new SparkDataFrame with the new columns added or replaced.
--- End diff --
added
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