From 048b9d40d395e2e5a4b86a78e0cb9b3f3539fa66 Mon Sep 17 00:00:00 2001
From: minghong <englefly@gmail.com>
Date: Mon, 9 Sep 2024 09:47:27 +0800
Subject: [PATCH] fix

---
 .../nereids/processor/post/TopnFilterPushDownVisitor.java    | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/processor/post/TopnFilterPushDownVisitor.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/processor/post/TopnFilterPushDownVisitor.java
index 95cdbd9cc96af0b..a6c97cf4267741b 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/processor/post/TopnFilterPushDownVisitor.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/processor/post/TopnFilterPushDownVisitor.java
@@ -218,7 +218,9 @@ public Boolean visitPhysicalNestedLoopJoin(PhysicalNestedLoopJoin<? extends Plan
     public Boolean visitPhysicalRelation(PhysicalRelation relation, PushDownContext ctx) {
         if (supportPhysicalRelations(relation)
                 && relation.getOutputSet().containsAll(ctx.probeExpr.getInputSlots())) {
-            if (relation.getStats().getRowCount() > ctx.topn.getLimit() + ctx.topn.getOffset()) {
+            // in ut, relation.getStats() may return null
+            if (relation.getStats() == null
+                    || relation.getStats().getRowCount() > ctx.topn.getLimit() + ctx.topn.getOffset()) {
                 topnFilterContext.addTopnFilter(ctx.topn, relation, ctx.probeExpr);
                 return true;
             }
@@ -226,6 +228,7 @@ public Boolean visitPhysicalRelation(PhysicalRelation relation, PushDownContext
         return false;
     }
 
+
     private boolean supportPhysicalRelations(PhysicalRelation relation) {
         return relation instanceof PhysicalOlapScan
                 || relation instanceof PhysicalOdbcScan