xudong963 commented on code in PR #16362:
URL: https://github.com/apache/datafusion/pull/16362#discussion_r2157945137


##########
datafusion/optimizer/src/push_down_filter.rs:
##########
@@ -778,6 +779,16 @@ impl OptimizerRule for PushDownFilter {
             return Ok(Transformed::no(plan));
         };
 
+        let predicate = split_conjunction_owned(filter.predicate.clone());
+        let old_predicate_len = predicate.len();
+        let new_predicates = simplify_predicates(predicate)?;
+        if old_predicate_len != new_predicates.len() {
+            let Some(new_predicate) = conjunction(new_predicates) else {
+                return plan_err!("at least one expression exists");

Review Comment:
   Updated in 
https://github.com/apache/datafusion/pull/16362/commits/883f56201a9290b83b89611c13b6a7ed7ec943e8



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