alamb commented on code in PR #6462:
URL: https://github.com/apache/arrow-datafusion/pull/6462#discussion_r1207056961
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datafusion/expr/src/built_in_function.rs:
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@@ -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:
This panic will occur if someone adds a new BuiltInFunction and doesn't add
it to the built in list.
I can remove the panic but then if someone doesn't add the function to the
new LIST I was worried the error would be masked (the wrong function name would
be used or the lookup might fail). But maybe that is preferable 🤔
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