Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/14705#discussion_r75566267
--- Diff: R/pkg/R/generics.R ---
@@ -735,6 +752,8 @@ setGeneric("between", function(x, bounds) {
standardGeneric("between") })
setGeneric("cast", function(x, dataType) { standardGeneric("cast") })
#' @rdname columnfunctions
+#' @param x a Column object.
+#' @param ... additional argument(s).
--- End diff --
Ah I recall. These are generated by code but are exported functions - you
see their names match the generics.
For these I think we should put the roxygen block in the R file that has
the generator code, follow by NULL like what we have for write.ml in mllib.R
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