jayzhan211 opened a new issue, #10270:
URL: https://github.com/apache/datafusion/issues/10270
### Is your feature request related to a problem or challenge?
NVL and Nullif has signature uniform, which iterates valid types and creates
many possible types for them
```rust
TypeSignature::Uniform(number, valid_types) => valid_types
.iter()
.map(|valid_type| (0..*number).map(|_|
valid_type.clone()).collect())
.collect(),
```
I think they can have better signatures that take repeated first type as the
valid types.
```rust
TypeSignature::Equal(num) => {
vec![vec![current_types[0]; num]]
}
```
I think there are two benefits
1. only one valid type vector and it is good enough
2. no need to maintain supported types
### Describe the solution you'd like
_No response_
### Describe alternatives you've considered
_No response_
### Additional context
_No response_
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