Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/21255#discussion_r186942863
--- Diff: R/pkg/R/functions.R ---
@@ -2047,17 +2049,15 @@ setMethod("countDistinct",
#' \code{concat}: Concatenates multiple input columns together into a
single column.
#' If all inputs are binary, concat returns an output as binary.
Otherwise, it returns as string.
#'
-#' @rdname column_string_functions
+#' @rdname column_collection_functions
#' @aliases concat concat,Column-method
#' @examples
#'
#' \dontrun{
#' # concatenate strings
#' tmp <- mutate(df, s1 = concat(df$Class, df$Sex),
#' s2 = concat(df$Class, df$Sex, df$Age),
--- End diff --
for background, we want to keep example runnable as much as possible..
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