Github user yanboliang commented on a diff in the pull request:
https://github.com/apache/spark/pull/10037#discussion_r46397197
--- Diff: R/pkg/R/generics.R ---
@@ -623,6 +623,10 @@ setGeneric("getItem", function(x, ...) {
standardGeneric("getItem") })
#' @rdname column
#' @export
+setGeneric("isNaN", function(x) { standardGeneric("isNaN") })
--- End diff --
And acturally, ```isnan``` and ```isNaN``` has do same thing at SparkR side
only call different functions at Scala side.
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