diff --git a/fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java b/fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java
index 3cc2adf5b3..517bd248b5 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java
@@ -957,7 +957,7 @@ public class SessionVariable implements Serializable, Writable {
     public boolean dumpNereidsMemo = false;
 
     @VariableMgr.VarAttr(name = "memo_max_group_expression_size")
-    public int memoMaxGroupExpressionSize = 40000;
+    public int memoMaxGroupExpressionSize = 10000;
 
     @VariableMgr.VarAttr(name = ENABLE_MINIDUMP)
     public boolean enableMinidump = false;