Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/18366#discussion_r124453861
--- Diff: R/pkg/R/functions.R ---
@@ -90,8 +90,11 @@ NULL
#'
#' String functions defined for \code{Column}.
#'
-#' @param x Column to compute on. In \code{instr}, it is the substring to
check. In \code{format_number},
-#' it is the number of decimal place to format to.
+#' @param x Column to compute on except in the following methods:
+#' \itemize{
+#' \item \code{instr}: class "character", the substring to check.
--- End diff --
the form `class "character"` might not be commonly use around here.
how about like
https://stat.ethz.ch/R-manual/R-devel/library/utils/html/read.table.html, just
say
```
instr: character, the substring to check.
```
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