HyukjinKwon commented on issue #26087: [SPARK-29427][SQL] Create KeyValueGroupedDataset from existing columns in DataFrame URL: https://github.com/apache/spark/pull/26087#issuecomment-553413184 @hagerf pandas UDF for cogroup was added in Spark 3.0 and that thread is basically about that. This new particular API seems not requested multiple times to resolve this particular case. You could use reflection though to access private constructor. In fact its package level private so you can mimic the package structure to access as well.
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