Github user maropu commented on the issue:
https://github.com/apache/spark/pull/20166
BTW, the current `Datset.showString` prints rows thru `RowEncoder`
deserializers like;
```
scala> Seq(Seq(Seq(1, 2), Seq(3), Seq(4, 5, 6))).toDF("a").show(false)
+------------------------------------------------------------+
|a |
+------------------------------------------------------------+
|[WrappedArray(1, 2), WrappedArray(3), WrappedArray(4, 5, 6)]|
+------------------------------------------------------------+
```
If [we cast them before
prints](https://github.com/apache/spark/compare/master...maropu:CastToStringInShowString),
we could get more simpler forms like;
```
scala> Seq(Seq(Seq(1, 2), Seq(3), Seq(4, 5, 6))).toDF("a").show(false)
+------------------------+
|a |
+------------------------+
|[[1, 2], [3], [4, 5, 6]]|
+------------------------+
```
I'm not sure through, is this acceptable? (Probably, we might need to add a
option to keep the old behaviour)
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