diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/processor/post/TwoPhaseReadOpt.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/processor/post/TwoPhaseReadOpt.java
index 543f908456..18b7dbdf7f 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/processor/post/TwoPhaseReadOpt.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/processor/post/TwoPhaseReadOpt.java
@@ -92,6 +92,7 @@ public class TwoPhaseReadOpt extends PlanPostProcessor {
         PhysicalOlapScan olapScan;
         PhysicalProject<Plan> project = null;
         PhysicalFilter<Plan> filter = null;
+        child = localTopN.child();
         while (child instanceof Project || child instanceof Filter) {
             if (child instanceof Filter) {
                 filter = (PhysicalFilter<Plan>) child;