Garamda commented on code in PR #13511:
URL: https://github.com/apache/datafusion/pull/13511#discussion_r1980826096
##########
datafusion/sql/src/expr/function.rs:
##########
@@ -349,15 +365,49 @@ impl<S: ContextProvider> SqlToRel<'_, S> {
} else {
// User defined aggregate functions (UDAF) have precedence in case
it has the same name as a scalar built-in function
if let Some(fm) = self.context_provider.get_aggregate_meta(&name) {
- let order_by = self.order_by_to_sort_expr(
- order_by,
- schema,
- planner_context,
- true,
- None,
- )?;
- let order_by = (!order_by.is_empty()).then_some(order_by);
- let args = self.function_args_to_expr(args, schema,
planner_context)?;
+ if fm.is_ordered_set_aggregate() && within_group.is_empty() {
+ return plan_err!("WITHIN GROUP clause is required when
calling ordered set aggregate function({})", fm.name());
+ }
+
+ if null_treatment.is_some() &&
!fm.supports_null_handling_clause() {
+ return plan_err!(
+ "[IGNORE | RESPECT] NULLS are not permitted for {}",
+ fm.name()
+ );
+ }
Review Comment:
> This was smelling odd, so I dug a bit deeper. I think you've inadvertantly
stumbled into something even weirder than you anticipated
> ...
> The RESPECT NULLS | IGNORE NULLS options is only a property of certain
window functions, hence we shouldn't need to track it for aggregate functions.
>
> I'm going to file a ticket for the above.
> ...
> Per my point about [IGNORE | RESPECT] NULLS being a property of window
functions, I don't think we need this check here.
I understood and agree with your guidance.
I will track what is decided in the issue you filed, and will remove some
codes out after determination.
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