xudong963 commented on code in PR #18817:
URL: https://github.com/apache/datafusion/pull/18817#discussion_r2559218340
##########
datafusion/physical-plan/src/execution_plan.rs:
##########
@@ -682,6 +684,16 @@ pub trait ExecutionPlan: Debug + DisplayAs + Send + Sync {
) -> Option<Arc<dyn ExecutionPlan>> {
None
}
+
+ /// Try to create a new execution plan that satisfies the given sort
ordering.
+ ///
+ /// Default implementation returns `Ok(None)`.
+ fn try_pushdown_sort(
Review Comment:
Do we need to add the API for `ExecutionPlan`? Is it possible to push down
sort during the pushdown sort optimizer? Because we need to traverse the plan
in the rule, so it looks possible to find the target node and directly give it
the order.
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