jcsherin opened a new issue, #11625:
URL: https://github.com/apache/datafusion/issues/11625
### Is your feature request related to a problem or challenge?
For a brief time we considered it necessary to extend `StateFieldArgs` to
include the `nullable` derived from the schema of the first argument. So that
we could define a list item for the accumulator state like this:
```rust
// The data type and the `nullable` is equivalent to schema of the first
argument
Field::new("item", args.input_type.clone(), args.input_nullable)
```
_Note: The field `input_nullable` in the above code does not exist in
`StateFieldArgs`._
Instead we currently do this in code:
```rust
Field::new("item", args.input_type.clone(), true) // allows null values in
aggregate computation
```
We take advantage of the fact that currently aggregates do no have any
special treatment for null values present inside list of accumulator state. So
we can avoid adding a new field like `input_nullable` to `StateFieldArgs`.
### Describe the solution you'd like
Capture this decision explicitly as a doc comment to benefit future readers
of code. Add the comment to the following aggregates:
1. `sum`
2. `count`
3. `array_agg`
4. `nth_value`
5. `bit_and_or_xor`
There are no code changes required.
### Describe alternatives you've considered
_No response_
### Additional context
See https://github.com/apache/datafusion/issues/11433#issuecomment-2238576514
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