cloud-fan commented on issue #26087: [SPARK-29427][SQL] Create KeyValueGroupedDataset from existing columns in DataFrame URL: https://github.com/apache/spark/pull/26087#issuecomment-553485027 > what the key type can be for df.groupBy("a", "b", "c") It can be a case class. I think this should be similar to `df.as[T]`. We can always find a java type to match a certain schema.
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