Github user actuaryzhang commented on a diff in the pull request:
https://github.com/apache/spark/pull/18422#discussion_r124718755
--- Diff: R/pkg/R/functions.R ---
@@ -132,23 +132,40 @@ NULL
#' df <- createDataFrame(as.data.frame(Titanic, stringsAsFactors = FALSE))}
NULL
-#' lit
+#' Non-aggregate functions for Column operations
#'
-#' A new \linkS4class{Column} is created to represent the literal value.
-#' If the parameter is a \linkS4class{Column}, it is returned unchanged.
+#' Non-aggregate functions defined for \code{Column}.
#'
-#' @param x a literal value or a Column.
+#' @param x Column to compute on. In \code{lit}, it is a literal value or
a Column.
+#' In \code{monotonically_increasing_id}, it should be empty.
+#' @param y Column to compute on.
+#' @param ... additional argument(s). In \code{expr}, it contains an
expression character
--- End diff --
Right, thanks for catching this.
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