Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/20254#discussion_r161365416
--- Diff: R/pkg/R/DataFrame.R ---
@@ -2873,6 +2873,7 @@ setMethod("intersect",
#' @rdname except
#' @export
#' @note except since 1.4.0
+#' @note behaviour changed from \code{EXCEPT ALL} to \code{EXCEPT
DISTINCT} in 2.0.
--- End diff --
ie.
```
#' but not in another SparkDataFrame. This is equivalent to \code{EXCEPT
DISTINCT} in SQL.
#'
#' Note: Before Spark 2.0.0, the behavior was equivalent to `EXCEPT ALL` in
SQL.
#'
#' @param x a SparkDataFrame.
```
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