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-553436169 The `dataframe cogroup` sounds like a valid use case, but not sure how to express it in SQL. Have you tried to do `df.repartition(numPartitions, $"key").rdd` and cogroup the RDD?
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