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-553436914 another option might be to have an API to convert `RelationalGroupedDataset` to `KeyValueGroupedDataset`, something like `df.groupBy('key).as[KeyType].cogroup`
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