diff --git a/src/sql/engine/join/ob_merge_join_vec_op.cpp b/src/sql/engine/join/ob_merge_join_vec_op.cpp
index 750fdd01b8..dede222ac2 100644
--- a/src/sql/engine/join/ob_merge_join_vec_op.cpp
+++ b/src/sql/engine/join/ob_merge_join_vec_op.cpp
@@ -39,7 +39,11 @@ OB_SERIALIZE_MEMBER((ObMergeJoinVecSpec, ObJoinVecSpec),
                     equal_cond_infos_,
                     merge_directions_,
                     left_child_fetcher_all_exprs_,
-                    right_child_fetcher_all_exprs_);
+                    right_child_fetcher_all_exprs_,
+                    left_child_fetcher_equal_keys_,
+                    right_child_fetcher_equal_keys_,
+                    left_child_fetcher_equal_keys_idx_,
+                    right_child_fetcher_equal_keys_idx_);
 
 OB_SERIALIZE_MEMBER(ObMergeJoinVecSpec::EqualConditionInfo, expr_, ser_eval_func_, is_opposite_);
 const int64_t ObMergeJoinVecSpec::MERGE_DIRECTION_ASC = 1;
diff --git a/src/sql/engine/join/ob_merge_join_vec_op.h b/src/sql/engine/join/ob_merge_join_vec_op.h
index 2885f6b331..9acd5fd9a1 100644
--- a/src/sql/engine/join/ob_merge_join_vec_op.h
+++ b/src/sql/engine/join/ob_merge_join_vec_op.h
@@ -64,7 +64,11 @@ public:
      equal_cond_infos_(alloc),
      merge_directions_(alloc),
      left_child_fetcher_all_exprs_(alloc),
-     right_child_fetcher_all_exprs_(alloc)
+     right_child_fetcher_all_exprs_(alloc),
+     left_child_fetcher_equal_keys_(alloc),
+     right_child_fetcher_equal_keys_(alloc),
+     left_child_fetcher_equal_keys_idx_(alloc),
+     right_child_fetcher_equal_keys_idx_(alloc)
   {}
 
   virtual ~ObMergeJoinVecSpec() {};
@@ -96,6 +100,10 @@ public:
   common::ObFixedArray<int64_t, common::ObIAllocator> merge_directions_;
   ExprFixedArray left_child_fetcher_all_exprs_;
   ExprFixedArray right_child_fetcher_all_exprs_;
+  ExprFixedArray left_child_fetcher_equal_keys_;
+  ExprFixedArray right_child_fetcher_equal_keys_;
+  common::ObFixedArray<int64_t, common::ObIAllocator> left_child_fetcher_equal_keys_idx_;
+  common::ObFixedArray<int64_t, common::ObIAllocator> right_child_fetcher_equal_keys_idx_;
 
 private:
   DISALLOW_COPY_AND_ASSIGN(ObMergeJoinVecSpec);