Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/21228#discussion_r186252480
--- Diff: R/pkg/R/functions.R ---
@@ -963,6 +964,7 @@ setMethod("kurtosis",
#' last(df$c, TRUE)
#' }
#' @note last since 1.4.0
+#' @note the function is non-deterministic because its result depends on
order of rows.
--- End diff --
same here about `@note`
ditto in all other cases
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