timsaucer commented on code in PR #20451:
URL: https://github.com/apache/datafusion/pull/20451#discussion_r2977109343


##########
datafusion/physical-optimizer/src/optimizer.rs:
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@@ -50,7 +50,7 @@ use datafusion_physical_plan::ExecutionPlan;
 /// `PhysicalOptimizerRule`s.
 ///
 /// [`SessionState::add_physical_optimizer_rule`]: 
https://docs.rs/datafusion/latest/datafusion/execution/session_state/struct.SessionState.html#method.add_physical_optimizer_rule
-pub trait PhysicalOptimizerRule: Debug {
+pub trait PhysicalOptimizerRule: Debug + std::any::Any {

Review Comment:
   With regard to that, may I interest you in this PR which removes almost 1200 
lines? https://github.com/apache/datafusion/pull/20812



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