Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/20787#discussion_r186277140
--- Diff: R/pkg/R/functions.R ---
@@ -1906,6 +1906,7 @@ setMethod("atan2", signature(y = "Column"),
#' @details
#' \code{datediff}: Returns the number of days from \code{y} to \code{x}.
+#' If \code{y} is later than \code{x} then the result is positive.
--- End diff --
I'd add the same sentence to Python and Scala side too.
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