Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/21649#discussion_r199057309
--- 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 --
in R list could have a list too, not sure if we should recurse indefinitely
```
> a <- list(list(a = 1, b = 2))
> a
[[1]]
[[1]]$a
[1] 1
[[1]]$b
[1] 2
```
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