jcsherin commented on code in PR #12030:
URL: https://github.com/apache/datafusion/pull/12030#discussion_r1719704089
##########
datafusion/physical-plan/src/windows/mod.rs:
##########
@@ -375,6 +378,16 @@ impl BuiltInWindowFunctionExpr for WindowUDFExpr {
fn reverse_expr(&self) -> Option<Arc<dyn BuiltInWindowFunctionExpr>> {
None
}
+
+ fn get_result_ordering(&self, schema: &SchemaRef) ->
Option<PhysicalSortExpr> {
+ self.fun
+ .sort_options()
Review Comment:
The user-defined window function can specify its result ordering which will
be used for updating ordering equivalences.
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