Narine Kokhlikyan created SPARK-17177:
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Summary: Make grouping columns accessible from
RelationalGroupedDataset
Key: SPARK-17177
URL: https://issues.apache.org/jira/browse/SPARK-17177
Project: Spark
Issue Type: New Feature
Reporter: Narine Kokhlikyan
Priority: Minor
Currently, once we create `RelationalGroupedDataset`, we cannot access the
grouping columns from its instance.
Analog to `Dataset` we can have a public method which returns the list of
grouping columns.
https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala#L457
This can be useful for instance in SparkR when we want to have certain logic
associated with the grouping columns, accessible from
`RelationalGroupedDataset`.
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