findepi commented on code in PR #5623:
URL: https://github.com/apache/datafusion/pull/5623#discussion_r1667008120
##########
datafusion/optimizer/src/optimizer.rs:
##########
@@ -330,15 +324,14 @@ impl Optimizer {
}
log_plan(&format!("Optimized plan (pass {i})"), &new_plan);
- // TODO this is an expensive way to see if the optimizer did
anything and
- // it would be better to change the OptimizerRule trait to return
an Option
- // instead
- if old_plan.as_ref() == &new_plan {
+ // HashSet::insert returns, whether the value was newly inserted.
+ let plan_is_fresh =
+ previous_plans.insert(LogicalPlanSignature::new(&new_plan));
+ if !plan_is_fresh {
Review Comment:
filed https://github.com/apache/datafusion/issues/11285 for this
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