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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