Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/21649#discussion_r198722311
--- Diff: R/pkg/R/DataFrame.R ---
@@ -3905,6 +3905,18 @@ setMethod("rollup",
groupedData(sgd)
})
+isTypeAllowed <- function(x) {
--- End diff --
this is specific to hint types right? let's clarify that in the func name?
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