diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/agg/MultiDistinctSum.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/agg/MultiDistinctSum.java
index 8441e02828..b440d91a31 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/agg/MultiDistinctSum.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/agg/MultiDistinctSum.java
@@ -20,7 +20,6 @@ package org.apache.doris.nereids.trees.expressions.functions.agg;
 import org.apache.doris.catalog.FunctionSignature;
 import org.apache.doris.nereids.exceptions.AnalysisException;
 import org.apache.doris.nereids.trees.expressions.Expression;
-import org.apache.doris.nereids.trees.expressions.functions.AlwaysNotNullable;
 import org.apache.doris.nereids.trees.expressions.functions.ComputePrecisionForSum;
 import org.apache.doris.nereids.trees.expressions.functions.ExplicitlyCastableSignature;
 import org.apache.doris.nereids.trees.expressions.shape.UnaryExpression;
@@ -35,7 +34,7 @@ import com.google.common.collect.ImmutableList;
 import java.util.List;
 
 /** MultiDistinctSum */
-public class MultiDistinctSum extends AggregateFunction implements UnaryExpression, AlwaysNotNullable,
+public class MultiDistinctSum extends NullableAggregateFunction implements UnaryExpression,
         ExplicitlyCastableSignature, ComputePrecisionForSum, MultiDistinction {
 
     public static final List<FunctionSignature> SIGNATURES = ImmutableList.of(
@@ -45,11 +44,15 @@ public class MultiDistinctSum extends AggregateFunction implements UnaryExpressi
     );
 
     public MultiDistinctSum(Expression arg0) {
-        super("multi_distinct_sum", true, arg0);
+        super("multi_distinct_sum", true, false, arg0);
     }
 
     public MultiDistinctSum(boolean distinct, Expression arg0) {
-        super("multi_distinct_sum", true, arg0);
+        super("multi_distinct_sum", true, false, arg0);
+    }
+
+    public MultiDistinctSum(boolean distinct, boolean alwaysNullable, Expression arg0) {
+        super("multi_distinct_sum", true, alwaysNullable, arg0);
     }
 
     @Override
@@ -64,6 +67,11 @@ public class MultiDistinctSum extends AggregateFunction implements UnaryExpressi
         return new Sum(getArgument(0)).getSignatures();
     }
 
+    @Override
+    public NullableAggregateFunction withAlwaysNullable(boolean alwaysNullable) {
+        return new MultiDistinctSum(distinct, alwaysNullable, children.get(0));
+    }
+
     @Override
     public MultiDistinctSum withDistinctAndChildren(boolean distinct, List<Expression> children) {
         Preconditions.checkArgument(children.size() == 1);
diff --git a/regression-test/data/nereids_syntax_p0/adjust_nullable.out b/regression-test/data/nereids_syntax_p0/adjust_nullable.out
index 4c443b8493..485b1414ea 100644
--- a/regression-test/data/nereids_syntax_p0/adjust_nullable.out
+++ b/regression-test/data/nereids_syntax_p0/adjust_nullable.out
@@ -4,3 +4,5 @@
 2
 3
 
+-- !distinct_sum --
+
diff --git a/regression-test/suites/nereids_syntax_p0/adjust_nullable.groovy b/regression-test/suites/nereids_syntax_p0/adjust_nullable.groovy
index 5014dd7b1d..24fb20d9aa 100644
--- a/regression-test/suites/nereids_syntax_p0/adjust_nullable.groovy
+++ b/regression-test/suites/nereids_syntax_p0/adjust_nullable.groovy
@@ -64,5 +64,36 @@ suite("adjust_nullable") {
     order by
       subq_1.gid;
     """
+
+    sql """
+        drop table if exists table_7_undef_undef;
+    """
+    sql """
+        drop table if exists table_8_undef_undef;
+    """
+    sql """
+        create table table_7_undef_undef (`pk` int,`col_int_undef_signed` int  ,`col_varchar_10__undef_signed` varchar(10)  ,`col_varchar_1024__undef_signed` varchar(1024)  ) engine=olap distributed by hash(pk) buckets 10 properties(    'replication_num' = '1');
+    """
+    sql """
+        create table table_8_undef_undef (`pk` int,`col_int_undef_signed` int  ,`col_varchar_10__undef_signed` varchar(10)  ,`col_varchar_1024__undef_signed` varchar(1024)  ) engine=olap distributed by hash(pk) buckets 10 properties(    'replication_num' = '1');
+    """
+
+    sql """
+        insert into table_7_undef_undef values (0,6,"didn't","was"),(1,1,"mean",'k'),(2,2,'i','i'),(3,null,'y','p'),(4,8,"you're","and"),(5,6,'i','o'),(6,null,"have","not");
+    """
+    sql """
+        insert into table_8_undef_undef values (0,null,"one",'m'),(1,null,"got",'m'),(2,9,'m','b'),(3,null,"say",'p'),(4,null,'t',"yeah"),(5,null,'y',"because"),(6,null,"from",'q'),(7,null,"the","in");
+    """
+
+    qt_distinct_sum """
+        SELECT    SUM( DISTINCT alias1 . `col_int_undef_signed` ) AS field1 FROM  table_7_undef_undef AS alias1  LEFT  JOIN table_8_undef_undef AS alias2 ON alias1 . `col_varchar_1024__undef_signed` = alias2 . `col_varchar_1024__undef_signed`  WHERE alias2 . `pk` >= alias2 . `col_int_undef_signed`  HAVING field1 <> 8 ORDER BY field1  , field1  ; 
+    """
+
+    sql """
+        drop table if exists table_7_undef_undef;
+    """
+    sql """
+        drop table if exists table_8_undef_undef;
+    """
 }