jayzhan211 commented on code in PR #12308:
URL: https://github.com/apache/datafusion/pull/12308#discussion_r1742906482
##########
datafusion/functions/src/core/coalesce.rs:
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@@ -60,12 +60,16 @@ impl ScalarUDFImpl for CoalesceFunc {
}
fn return_type(&self, arg_types: &[DataType]) -> Result<DataType> {
- Ok(arg_types[0].clone())
+ Ok(arg_types
+ .iter()
+ .find_or_first(|d| !d.is_null())
+ .unwrap()
Review Comment:
Only if the `arg_types` is empty, the unwrap panics. But the length check is
handled in `coerce_types`, so it is safe to unwrap here.
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