Enhance ArrayAgg to preserve input field nullability #19768
Description
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
There are additional updates that will need to be made in the accumulator.