Github user yanboliang commented on a diff in the pull request:
https://github.com/apache/spark/pull/10037#discussion_r46644003
--- 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 --
```isNull``` and ```isNotNull``` are still exported after this PR because
they have been exist at Spark 1.5. ```isNull``` and ```isNotNull``` (with upper
case) are functions of ```Column```, I consider they are Spark specific
functions so did not remove them. If we want to remove them, I can do it in a
follow-up PR and they are breaking changes need to be explain in release note.
@shivaram
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