jcsherin commented on code in PR #12030:
URL: https://github.com/apache/datafusion/pull/12030#discussion_r1719702820
##########
datafusion/physical-plan/src/windows/mod.rs:
##########
@@ -356,8 +356,11 @@ impl BuiltInWindowFunctionExpr for WindowUDFExpr {
}
fn field(&self) -> Result<Field> {
- let nullable = true;
- Ok(Field::new(&self.name, self.data_type.clone(), nullable))
+ Ok(Field::new(
+ &self.name,
+ self.data_type.clone(),
+ self.fun.nullable(),
Review Comment:
This is why `nullable` method was added to `WindowUDFImpl` so that the
user-defined window function can customize nullability of column values.
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