Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/21307#discussion_r187788406
--- Diff: R/pkg/R/functions.R ---
@@ -2055,20 +2058,10 @@ setMethod("countDistinct",
#' @details
#' \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.
+#' The function works with strings, binary and compatible array columns.
--- End diff --
btw, what does "compatible array columns" mean?
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