Github user yu-iskw commented on a diff in the pull request:
https://github.com/apache/spark/pull/8194#discussion_r37131453
--- Diff: R/pkg/R/functions.R ---
@@ -67,6 +67,14 @@ createFunctions <- function() {
createFunctions()
+#' @rdname functions
+#' @return Creates a Column class of literal value.
+#' @export
+lit <- function(x) {
--- End diff --
Can we define a S4 function which has argument signitures which are like
`Any`? As far as I know, `setMethod` requires signatures of argument objects.
The argument of `lit` in Scala is `Any`. Otherwise, we should define
multiple S4 function as follows.
```
setMethod("lit", signature("numeric"), .....)
setMethod("lit", signature("character"), .....)
...
```
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