andygrove commented on code in PR #12308:
URL: https://github.com/apache/datafusion/pull/12308#discussion_r1742798249
##########
datafusion/functions/src/core/coalesce.rs:
##########
@@ -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:
I wonder if it is ever possible for this unwrap to panic? I could trigger it
by explicitly calling `return_type(&[])` but perhaps this would never happen
via SQL
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