Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/21244#discussion_r186254858
--- Diff: R/pkg/R/generics.R ---
@@ -918,6 +918,10 @@ setGeneric("explode_outer", function(x) {
standardGeneric("explode_outer") })
#' @name NULL
setGeneric("expr", function(x) { standardGeneric("expr") })
+#' @rdname column_collection_functions
+#' @name NULL
+setGeneric("flatten", function(x, value) { standardGeneric("flatten") })
--- End diff --
`function(x) { standardGeneric("flatten") }`?
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