Github user shivaram commented on the issue:
https://github.com/apache/spark/pull/14431
Sure - Appending more information to the R object is fine. Also it looks
like we actually have a handle to the RelationalGroupedDataset when we call
groupBy on the scala side
https://github.com/apache/spark/blob/b89b3a5c8e391fcaebe7ef3c77ef16bb9431d6ab/sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala#L1288
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