Jefffrey commented on PR #18091:
URL: https://github.com/apache/datafusion/pull/18091#issuecomment-4395409405
> I guess what I'm asking is why spark's `avg`'s return type was modified to
be Float64 in `spark/src/function/aggregate/avg.rs`
>
> ```
> fn return_type(&self, _arg_types: &[DataType]) -> Result<DataType> {
> Ok(DataType::Float64)
> }
> ```
>
> whereas previously it used the `avg_return_type` which had spark specific
behavior
At the time of this refactor it only supported f64 input which mapped to f64
output.
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