Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/22227#discussion_r214566285
--- 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 --
The current build failure:
```
Undocumented arguments in documentation object 'column_string_functions'
'limit'
Functions with \usage entries need to have the appropriate \alias
entries, and all their arguments documented.
The \usage entries must correspond to syntactically valid R code.
See the chapter 'Writing R documentation files' in the 'Writing R
```
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