Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/20166
I think this is a bug, in `Dataset.showString` I see code like
```
case seq: Seq[_] => seq.mkString("[", ", ", "]")
```
Which means we do want to show strings like `[[1, 2], [3], [4, 5, 6]]`
Anyway let's fix in another PR, I'm merging this PR first
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