kosiew commented on PR #19524:
URL: https://github.com/apache/datafusion/pull/19524#issuecomment-3701487018
hi @Jefffrey
How about:
```
impl SubstrFunc {
pub fn new() -> Self {
let string =
Coercion::new_exact(TypeSignatureClass::Native(logical_string()));
let int64 = Coercion::new_implicit(
TypeSignatureClass::Native(logical_int64()),
vec![TypeSignatureClass::Native(logical_int32())],
NativeType::Int64,
);
Self {
signature: Signature::from_parameter_variants(
&[
vec![("str", string.clone()), ("start_pos",
int64.clone())],
vec![
("str", string.clone()),
("start_pos", int64.clone()),
("length", int64.clone()),
],
],
Volatility::Immutable,
)
.expect("valid parameter variants"),
aliases: vec![String::from("substring")],
}
}
}
```
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