diff --git a/src/rootserver/ob_ddl_service.cpp b/src/rootserver/ob_ddl_service.cpp
index 958c18ac82..616380642c 100755
--- a/src/rootserver/ob_ddl_service.cpp
+++ b/src/rootserver/ob_ddl_service.cpp
@@ -7875,7 +7875,7 @@ int ObDDLService::modify_generated_column_default_value(ObColumnSchemaV2 &genera
       const ObTenantSchema *tenant_schema = NULL;
       ObSchemaGetterGuard schema_guard;
       ObRawExpr *expr = NULL;
-      lib::Worker::CompatMode compat_mode;
+      lib::Worker::CompatMode compat_mode = lib::Worker::CompatMode::INVALID;
 
       if (OB_FAIL(default_session.init(0, 0, &allocator))) {
         LOG_WARN("init empty session failed", K(ret));
@@ -7946,7 +7946,7 @@ int ObDDLService::modify_generated_column_local_vars(ObColumnSchemaV2 &generated
       const ObTenantSchema *tenant_schema = NULL;
       ObSchemaGetterGuard schema_guard;
       ObRawExpr *expr = NULL;
-      lib::Worker::CompatMode compat_mode;
+      lib::Worker::CompatMode compat_mode = lib::Worker::CompatMode::INVALID;
       if (OB_FAIL(default_session.init(0, 0, &allocator))) {
         LOG_WARN("init empty session failed", K(ret));
       } else if (OB_FAIL(schema_service_->get_tenant_schema_guard(tenant_id, schema_guard))) {
@@ -8157,7 +8157,7 @@ int ObDDLService::modify_func_expr_column_name(
     } else {
       char *new_part_func_expr_buf = NULL;
       int64_t outer_pos = 0;
-      lib::Worker::CompatMode compat_mode;
+      lib::Worker::CompatMode compat_mode = lib::Worker::CompatMode::INVALID;
       if (OB_ISNULL(new_part_func_expr_buf =
                     static_cast<char *>(allocator.alloc(OB_MAX_SQL_LENGTH)))) {
         ret = OB_ALLOCATE_MEMORY_FAILED;
@@ -8545,7 +8545,7 @@ int ObDDLService::rebuild_constraint_check_expr(
       } else {
         char *new_check_expr_buf = NULL;
         int64_t outer_pos = 0;
-        lib::Worker::CompatMode compat_mode;
+        lib::Worker::CompatMode compat_mode = lib::Worker::CompatMode::INVALID;
         if (OB_ISNULL(new_check_expr_buf =
                       static_cast<char *>(allocator.alloc(OB_MAX_SQL_LENGTH)))) {
           ret = OB_ALLOCATE_MEMORY_FAILED;
diff --git a/src/share/schema/ob_table_sql_service.cpp b/src/share/schema/ob_table_sql_service.cpp
index 9fa6c562c9..4da5a348d9 100644
--- a/src/share/schema/ob_table_sql_service.cpp
+++ b/src/share/schema/ob_table_sql_service.cpp
@@ -1115,7 +1115,7 @@ int ObTableSqlService::add_columns_for_core(ObISQLClient &sql_client, const ObTa
   }
   // for batch sql query
   bool enable_stash_query = false;
-  ObSqlTransQueryStashDesc *stash_desc;
+  ObSqlTransQueryStashDesc *stash_desc = NULL;
   ObMySQLTransaction* trans = dynamic_cast<ObMySQLTransaction*>(&sql_client);
   if (OB_SUCC(ret) && trans != nullptr && trans->get_enable_query_stash()) {
     enable_stash_query = true;
@@ -1198,8 +1198,8 @@ int ObTableSqlService::add_columns_for_not_core(ObISQLClient &sql_client,
   ObSqlString *column_history_sql_ptr = &column_history_sql_obj;
   // for batch sql query
   bool enable_stash_query = false;
-  ObSqlTransQueryStashDesc *stash_desc;
-  ObSqlTransQueryStashDesc *stash_desc2;
+  ObSqlTransQueryStashDesc *stash_desc = NULL;
+  ObSqlTransQueryStashDesc *stash_desc2 = NULL;
   ObMySQLTransaction* trans = dynamic_cast<ObMySQLTransaction*>(&sql_client);
   if (OB_SUCC(ret) && trans != nullptr && trans->get_enable_query_stash()) {
     if (OB_FAIL(trans->get_stash_query(tenant_id, OB_ALL_COLUMN_TNAME, stash_desc))) {