hagerf edited a comment on issue #26087: [SPARK-29427][SQL] Create KeyValueGroupedDataset from existing columns in DataFrame URL: https://github.com/apache/spark/pull/26087#issuecomment-553440561 @cloud-fan yes. My first idea was to convert `RelationalGroupedDataset` to `KeyValueGroupedDataset`. But @viirya was super fast in creating this PR 😊, and the changes seemed to be very small, so I thought maybe this would be easier? I think `df.groupByKey("key").keyAs[String].cogroup(...` is fairly easy to understand as well. I don't really mind which solution, but that the only way to create `KeyValueGroupedDataset` is through passing a function to `groupByKey` is unnecessarily limiting.
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