Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/22227#discussion_r219690825
--- Diff: R/pkg/R/functions.R ---
@@ -3404,19 +3404,27 @@ setMethod("collect_set",
#' Equivalent to \code{split} SQL function.
#'
#' @rdname column_string_functions
+#' @param limit determines the length of the returned array.
--- End diff --
shall we mention this is an optional param?
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