Github user actuaryzhang commented on a diff in the pull request:
https://github.com/apache/spark/pull/18366#discussion_r123756917
--- Diff: R/pkg/R/functions.R ---
@@ -86,6 +86,22 @@ NULL
#' df <- createDataFrame(data.frame(time = as.POSIXct(dts), y = y))}
NULL
+#' String functions for Column operations
+#'
+#' 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},
--- End diff --
In the string functions, `instr` and `format_number` are the only two
methods that have the `(y, x)` signature. And yes, there was doc on the `y`
parameter down below. Now I bring it up and document here.
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