Github user viirya commented on the issue: https://github.com/apache/spark/pull/19363 Although this `toString` in scala-shell looks good, when you print out directly, it might look weird because you just see: ```scala [key: [value: string], value: [value: string]] ``` It's better to add prefix of the class name, like. ```scala KeyValueGroupedDataset: [key: [value: string], value: [value: string]] ```
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