Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/22227#discussion_r214563339
--- Diff: R/pkg/R/functions.R ---
@@ -3410,13 +3410,15 @@ setMethod("collect_set",
#' \dontrun{
#' head(select(df, split_string(df$Sex, "a")))
#' head(select(df, split_string(df$Class, "\\d")))
+#' head(select(df, split_string(df$Class, "\\d", 2)))
--- End diff --
We should add documentation for R side too. Please document `limit` here
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