alamb commented on code in PR #6462:
URL: https://github.com/apache/arrow-datafusion/pull/6462#discussion_r1207115134
##########
datafusion/expr/src/built_in_function.rs:
##########
@@ -431,29 +452,21 @@ impl BuiltinScalarFunction {
impl fmt::Display for BuiltinScalarFunction {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
- for (func_name, func) in NAME_TO_FUNCTION.iter() {
- if func == self {
- return write!(f, "{}", func_name);
- }
+ if let Some(func_name) = FUNCTION_TO_NAME.get(self) {
+ write!(f, "{}", func_name)
+ } else {
+ // Should not be reached
+ panic!("Internal error: {self:?} not in ALL_FUNCTIONS list");
Review Comment:
> I can play with this and create another PR
Thank you 🙏
Note one gotcha you might hit is that the mapping is one-> many
So you might need something like
```sql
/// returns all the names that can be used for this function
fn names(func: BuiltinScalarFunction) -> &[&'str]] {
match func {
BuiltinScalarFunction::Abs => "abs"
....
}
}
```
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