Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/21649#discussion_r198722659
--- Diff: R/pkg/R/DataFrame.R ---
@@ -3905,6 +3905,18 @@ setMethod("rollup",
groupedData(sgd)
})
+isTypeAllowed <- function(x) {
+ if (is.character(x)) {
+ TRUE
+ } else if (is.list(x)) {
--- End diff --
how is `list` going to be used? for instance, do we need to recurse into to
check the type of items in the list?
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