chenkovsky commented on code in PR #16538:
URL: https://github.com/apache/datafusion/pull/16538#discussion_r2167849726


##########
datafusion/sql/src/expr/function.rs:
##########
@@ -375,6 +375,10 @@ impl<S: ContextProvider> SqlToRel<'_, S> {
                     return plan_err!("WITHIN GROUP clause is required when 
calling ordered set aggregate function({})", fm.name());
                 }
 
+                if !fm.is_ordered_set_aggregate() && !within_group.is_empty() {
+                    return plan_err!("WITHIN GROUP clause is not permitted for 
non-ordered set aggregate function({})", fm.name());

Review Comment:
   I think order-sensitive means order is necessary. but for array_agg, order 
is optional.



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