Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21307#discussion_r187822362
--- 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 --
I think it basically mean the arrays of elements are compatibile and
castable for a wider type. (e.g. array<int> array<long> -> array<long>)
---
---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For additional commands, e-mail: reviews-h...@spark.apache.org
