diff --git a/src/gausskernel/optimizer/plan/createplan.cpp b/src/gausskernel/optimizer/plan/createplan.cpp
index 71d36c409791785893082f949af9af73a4e242fe..23101aee38ee2307e9542f95aa76166ff683b087 100755
--- a/src/gausskernel/optimizer/plan/createplan.cpp
+++ b/src/gausskernel/optimizer/plan/createplan.cpp
@@ -1258,7 +1258,7 @@ static Plan* create_append_plan(PlannerInfo* root, AppendPath* best_path)
     ListCell* subpaths = NULL;
 
     if (tlist == NIL) {
-        Const* c = make_const(NULL, makeString("Dummy"), 0);
+        Const* c = makeConst(INT4OID, -1, InvalidOid, -2, (Datum)0, true, false);
         tlist = lappend(tlist, makeTargetEntry((Expr*)c, 1, NULL, true));
     }
 
diff --git a/src/test/regress/output/vec_result.source b/src/test/regress/output/vec_result.source
index da935fe48a8637c79c49a89c13d6dc6fcf29bb76..5b714cea21b5779a9192829f1c49d5720288a106 100644
--- a/src/test/regress/output/vec_result.source
+++ b/src/test/regress/output/vec_result.source
@@ -446,9 +446,9 @@ GROUP BY ROLLUP(Column_026);
                        ->  CStore Scan on vector_result_engine.job_classification table_030
                              Output: 'Dummy'
                        ->  Vector Adapter
-                             Output: ('Dummy')
+                             Output: (NULL::integer)
                              ->  Result
-                                   Output: 'Dummy'
+                                   Output: NULL::integer
                                    One-Time Filter: false
                  ->  Vector Materialize
                        Output: table_037.location_type_desc
@@ -487,9 +487,9 @@ GROUP BY ROLLUP(Column_026);
                            ->  CStore Scan on vector_result_engine.job_classification table_030
                                  Output: 'Dummy'
                            ->  Vector Adapter
-                                 Output: ('Dummy')
+                                 Output: (NULL::integer)
                                  ->  Result
-                                       Output: 'Dummy'
+                                       Output: NULL::integer
                                        One-Time Filter: false
                      ->  Vector Materialize
                            Output: table_037.location_type_desc