Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/21482#discussion_r192577245
--- Diff: R/pkg/R/generics.R ---
@@ -695,6 +695,12 @@ setGeneric("getField", function(x, ...) {
standardGeneric("getField") })
#' @rdname columnfunctions
setGeneric("getItem", function(x, ...) { standardGeneric("getItem") })
+#' @rdname columnfunctions
+setGeneric("isInf", function(x) { standardGeneric("isInf") })
+
+#' @rdname columnfunctions
+setGeneric("isinf", function(x) { standardGeneric("isinf") })
--- End diff --
`isnan` lower case is not a column functions see
https://github.com/NihalHarish/spark/blob/7e396f70f58ffd309e7f738751f3aa8cfe321ce7/R/pkg/R/generics.R#L1002
`@rdname columnfunctions` will cause it to go to the wrong doc page
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