timsaucer opened a new issue, #19768:
URL: https://github.com/apache/datafusion/issues/19768
### Is your feature request related to a problem or challenge?
`ArrayAgg` produces an output with data type:
```
DataType::List(Arc::new(Field::new_list_field(
arg_types[0].clone(),
true,
)))
```
If the input field is non-nullable, then we should be able to preserve this
in the output.
### Describe the solution you'd like
Implement `return_field` and remove `return_type`. Preserve nullability of
the input.
### Describe alternatives you've considered
_No response_
### Additional context
_No response_
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