findepi commented on code in PR #13717:
URL: https://github.com/apache/datafusion/pull/13717#discussion_r1880199776
##########
datafusion/functions/src/datetime/date_part.rs:
##########
@@ -148,7 +148,9 @@ impl ScalarUDFImpl for DatePartFunc {
}
fn return_type(&self, _arg_types: &[DataType]) -> Result<DataType> {
- internal_err!("return_type_from_exprs shoud be called instead")
+ // return type could be Float32 or Int32 depending on the input
arguments
+ // return_type_from_exprs should be called instead
+ Ok(DataType::Float64)
Review Comment:
> this is a breaking change and is currently blocking Comet from upgrading
its DataFusion version.
i agree this is breaking and sorry to hear it affects Comet
i wish i knew how to make it non-breaking!
it seems this all boils down to the problem that expressions don't know
their types -- https://github.com/apache/datafusion/issues/12604
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