Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/21228#discussion_r186252477
--- Diff: R/pkg/R/functions.R ---
@@ -818,6 +818,7 @@ setMethod("factorial",
#' first(df$c, TRUE)
#' }
#' @note first(characterOrColumn) since 1.4.0
+#' @note the function is non-deterministic because its result depends on
order of rows.
--- End diff --
yes, for now it is.
in this case, and a "Note:..." after L806 "value it sees when na.rm is set
to true. If..."
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