Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/23161#discussion_r236972877
--- Diff: R/pkg/R/DataFrame.R ---
@@ -2732,14 +2732,24 @@ setMethod("union",
dataFrame(unioned)
})
-#' Return a new SparkDataFrame containing the union of rows
-#'
-#' This is an alias for `union`.
+#' Return a new SparkDataFrame containing the union of rows.
+#' This is an alias for \code{union}.
#'
-#' @rdname union
-#' @name unionAll
+#' @param x a SparkDataFrame.
+#' @param y a SparkDataFrame.
+#' @return A SparkDataFrame containing the result of the unionAll
operation.
+#' @family SparkDataFrame functions
#' @aliases unionAll,SparkDataFrame,SparkDataFrame-method
-#' @note unionAll since 1.4.0
+#' @rdname unionAll
+#' @name unionAll
--- End diff --
I'd add a `@seealso` to union
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