guojidan opened a new issue, #8756:
URL: https://github.com/apache/arrow-datafusion/issues/8756
### Is your feature request related to a problem or challenge?
close #8045 .
Now `ScalarUDF` is not supported `monotonicity`
### Describe the solution you'd like
_No response_
### Describe alternatives you've considered
I think `ScalarUDF's` monotonicity should defined by User-self, so we can
add `monotonicity` function for `ScalarUDFImpl` trait, like this:
```
pub trait ScalarUDFImpl {
fn monotonicity() -> Result<Option<FuncMonotonicity>> {
Ok(None)
}
}
```
### Additional context
_No response_
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