Jefffrey commented on code in PR #18653:
URL: https://github.com/apache/datafusion/pull/18653#discussion_r2525583072
##########
datafusion/functions/src/unicode/substr.rs:
##########
@@ -70,14 +74,30 @@ impl Default for SubstrFunc {
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::user_defined(Volatility::Immutable)
- .with_parameter_names(vec![
- "str".to_string(),
- "start_pos".to_string(),
- "length".to_string(),
- ])
- .expect("valid parameter names"),
+ signature: Signature::one_of(
+ vec![
+ TypeSignature::Coercible(vec![string.clone(),
int64.clone()]),
+ TypeSignature::Coercible(vec![
+ string.clone(),
+ int64.clone(),
+ int64.clone(),
+ ]),
+ ],
+ Volatility::Immutable,
+ )
+ .with_parameter_names(vec![
Review Comment:
Raised for tracking: https://github.com/apache/datafusion/issues/18685
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