Github user junyangq commented on a diff in the pull request:
https://github.com/apache/spark/pull/14705#discussion_r75430000
--- Diff: R/pkg/R/functions.R ---
@@ -3115,6 +3166,11 @@ setMethod("dense_rank",
#'
#' This is equivalent to the LAG function in SQL.
#'
+#' @param x the column as a character string or a Column to compute on.
+#' @param offset the number of rows back from the current row from which
to obtain a value.
+#' If not specified, the default is 1.
+#' @param defaultValue default to use when the offset row does not exist.
+#' @param ... further arguments to be passed to or from other methods.
--- End diff --
This is actually the issue I raised at the end of #14558. In the same doc,
it also includes generic definition, which also comes with `...` and this has
the actual meaning "further arguments to be passed".
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