diff --git a/cpp/CHANGELOG.md b/cpp/CHANGELOG.md
index 8d78dfba99..40d5ef2cd8 100644
--- a/cpp/CHANGELOG.md
+++ b/cpp/CHANGELOG.md
@@ -14,9 +14,6 @@ Please mark all change in change log and use the ticket from JIRA.
 
 ## Improvement
 - MS-156 - Add unittest for merge result functions
-
-- MS-152 - Delete assert in MySQLMetaImpl and change MySQLConnectionPool impl
-
 - MS-152 - Delete assert in MySQLMetaImpl and change MySQLConnectionPool impl
 
 ## New Feature
diff --git a/cpp/src/db/scheduler/task/SearchTask.cpp b/cpp/src/db/scheduler/task/SearchTask.cpp
index 8bea768a23..708bcc8708 100644
--- a/cpp/src/db/scheduler/task/SearchTask.cpp
+++ b/cpp/src/db/scheduler/task/SearchTask.cpp
@@ -67,7 +67,7 @@ std::shared_ptr<IScheduleTask> SearchTask::Execute() {
             //step 3: cluster result
             SearchContext::ResultSet result_set;
             auto spec_k = index_engine_->Count() < context->topk() ? index_engine_->Count() : context->topk();
-            ClusterResult(output_ids, output_distence, context->nq(), spec_k, result_set);
+            SearchTask::ClusterResult(output_ids, output_distence, context->nq(), spec_k, result_set);
             rc.Record("cluster result");
 
             //step 4: pick up topk result
diff --git a/cpp/unittest/db/search_test.cpp b/cpp/unittest/db/search_test.cpp
index ce99ea78f7..60d210956f 100644
--- a/cpp/unittest/db/search_test.cpp
+++ b/cpp/unittest/db/search_test.cpp
@@ -4,9 +4,7 @@
 // Proprietary and confidential.
 ////////////////////////////////////////////////////////////////////////////////
 #include "db/scheduler/task/SearchTask.h"
-
 #include <gtest/gtest.h>
-
 #include <cmath>
 #include <vector>