Github user NarineK commented on the issue:
https://github.com/apache/spark/pull/14431
It seems that, currently, in SparkR the `GroupedData` which represents
scala's GroupedData object doesn't have any information about the grouping
keys. `RelationalGroupedDataset` has a private attribute `groupingExpr` which
contains information about grouping columns, however it is not accessible from
R side. I was thinking that maybe we could pass grouping columns to groups.R
like: groupedData(sgd, cols).
Any thoughts @shivaram ?
Thanks!
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