joseph-isaacs opened a new issue, #12819:
URL: https://github.com/apache/datafusion/issues/12819
### Is your feature request related to a problem or challenge?
I am trying to create a scalar UDF, pack, which operates on struct arrays.
It packs many array into a struct array each with a distinct name
```pack(("a", arr1), ("b", arr2), ...) -> struct([("a", arr1.data_type),
("b", arr2.data_type), ...])```
This has a data type dependent on the input type and nullability. In the
method `ScalarUDFImpl::invoke` I want to return an a struct array with each
field having the data type and nullability of the input, however the invoke
function only gives the data type of the array not the nullability of the
record batch or intermediate children expressions.
I have returned this type information from `return_type_from_exprs`, I just
need to access this in the stateless scalar udf impl.
### Describe the solution you'd like
I would like add a new `ScalarUDFImpl::invoke_with_data_type` (or
`invoke_with_return_type`) method which is given both the evaluated children
array (as previously) and also either the previously returned type (from
`return_type_from_exprs`) or the arguments already passed to
`return_type_from_exprs` which could be re-evaluated by invoke. I am open to
either, I guess the former seems more performant.
### Describe alternatives you've considered
_No response_
### Additional context
I believe this would be a small non-breaking, change, that I am happy to
contribute.
Any ideas?
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