Jefffrey opened a new issue, #22709:
URL: https://github.com/apache/datafusion/issues/22709
### Is your feature request related to a problem or challenge?
these work:
```sql
> select arrow_cast(struct(10), 'Struct("c0": nullable Int64)');
+--------------------------------------------------------------------+
| arrow_cast(struct(Int64(10)),Utf8("Struct("c0": nullable Int64)")) |
+--------------------------------------------------------------------+
| {c0: 10} |
+--------------------------------------------------------------------+
1 row(s) fetched.
Elapsed 0.065 seconds.
> select arrow_cast(10, 'List(non-null Int64)');
+----------------------------------------------------+
| arrow_cast(Int64(10),Utf8("List(non-null Int64)")) |
+----------------------------------------------------+
| [10] |
+----------------------------------------------------+
1 row(s) fetched.
Elapsed 0.010 seconds.
```
this doesn't work, when field is specified to be non-nullable inside a
struct:
```sql
> select arrow_cast(struct(10), 'Struct("c0": non-null Int64)');
Optimizer rule 'simplify_expressions' failed
caused by
This feature is not implemented: Unsupported CAST from Struct("c0": Int64)
to Struct("c0": non-null Int64)
```
### Describe the solution you'd like
see if its possible to implement this support? it seems to work for lists
but not structs, so not sure if this is a limitation or theres a valid reason
to not allow this
### Describe alternatives you've considered
_No response_
### Additional context
i think somewhere around here in the codebase?
https://github.com/apache/datafusion/blob/5c92390921d8d667aa7cb7d56276a59ba36926f4/datafusion/physical-expr/src/expressions/cast.rs#L384-L416
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