jayzhan211 commented on code in PR #14440:
URL: https://github.com/apache/datafusion/pull/14440#discussion_r1939394767
##########
datafusion/expr-common/src/signature.rs:
##########
@@ -455,6 +461,46 @@ fn get_data_types(native_type: &NativeType) ->
Vec<DataType> {
}
}
+#[derive(Debug, Clone)]
+pub struct FunctionSignature {
+ pub parameters: Vec<ParameterSignature>,
+ /// The volatility of the function. See [Volatility] for more information.
+ pub volatility: Volatility,
+}
+
+pub type ParameterSignature = Vec<ParameterType>;
+
+#[derive(Debug, Clone, Eq, PartialOrd, Hash)]
+pub struct ParameterType {
+ pub param_type: LogicalTypeRef,
Review Comment:
`param_type`: target type of function signature
`allowed_casts`: implicit coercion allowed to cast to target type.
For example,
`param_type`: string
`allowed_casts`: binary, int
```
Valid: All are casted to string
func(string)
func(binary)
func(int)
Invalid:
func(float or other types)
```
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