AdamGS opened a new issue, #22713:
URL: https://github.com/apache/datafusion/issues/22713
### Describe the bug
The current average implementation assumes that the sum of the values in
`DecimalAverager` doesn't overflow for the Decimals underlying native type (i32
for Decimal32 etc).
The count is assumed to be a u64, so even an avg of `[1_i32; i32::MAX + 1]`
will overflow.
### To Reproduce
```
select avg(d), arrow_typeof(avg(d))
from (
select arrow_cast(99999, 'Decimal32(5, 0)') as d
from generate_series(1, 21476)
) t;
```
Currently fails with:
```
query failed: DataFusion error: Execution error: Arithmetic Overflow in
AvgAccumulator
```
### Expected behavior
Averages shouldn't overflow on intermediate state and should also return
correct results even if the intermediate state is bigger.
### Additional context
_No response_
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