Jefffrey commented on PR #22730:
URL: https://github.com/apache/datafusion/pull/22730#issuecomment-4650003213
one thing i find confusing is this seems inconsistent with lists, for example
```sql
> select arrow_typeof(a), arrow_cast(a, 'List(non-null Int64)') from values
([1, 2]), ([3, 4]) t(a);
+-------------------+----------------------------------------------+
| arrow_typeof(t.a) | arrow_cast(t.a,Utf8("List(non-null Int64)")) |
+-------------------+----------------------------------------------+
| List(Int64) | [1, 2] |
| List(Int64) | [3, 4] |
+-------------------+----------------------------------------------+
2 row(s) fetched.
Elapsed 0.005 seconds.
```
we are allowed to cast from a list with nullable inner field (by default i
think display of type doesn't show `nullable` if its nullable) to a non-null
inner field 🤔
could we investigate this discrepancy?
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