fix full join cte level

src/gausskernel/optimizer/prep/prepjointree.cpp

@@ -3439,6 +3439,13 @@ static Node* reduce_inequality_fulljoins_jointree_recurse(PlannerInfo* root, Nod
             IncrementVarSublevelsUp(j1->quals, 2, 1);
             IncrementVarSublevelsUp(j2->quals, 2, 1);
 
+            /*
+            * Upper-level vars in subquery are now two level far to their parent
+            * than before.
+            */
+            IncrementVarSublevelsUp((Node*)setop1, 2, 1);
+            IncrementVarSublevelsUp((Node*)setop2, 2, 1);
+
             /* No quals in FromExpr. Search 'QUALS SHOULD BE HERE.' in this
              * source code file.
              */

src/test/regress/expected/join_test_alias.out

@@ -158,3 +158,22 @@ order by 1,2,3,4;
     |    |        |      |  2 | li | adjani | 2000 |  3 | li | adjani | 5000
 (5 rows)
 
+--CTE test
+create table cte_test(w_zip text);
+create table cte_test2(w_name text);
+create table cte_test3(d_id text);
+with alias1 as (select w_zip alias2 from cte_test) select w_name from cte_test2 union select d_id from cte_test3 full join alias1 on cte_test3.d_id>alias1.alias2;
+ w_name 
+--------
+(0 rows)
+
+-- CTE test with smp
+set query_dop = 4;
+with alias1 as (select w_zip alias2 from cte_test) select w_name from cte_test2 union select d_id from cte_test3 full join alias1 on cte_test3.d_id>alias1.alias2;
+ w_name 
+--------
+(0 rows)
+
+drop table cte_test;
+drop table cte_test2;
+drop table cte_test3;

src/test/regress/sql/join_test_alias.sql

@@ -99,4 +99,21 @@ join fulljointest t3 on case t3.c4 when 100 then 'low'
 when 5000 then 'high'
 when 2000 then 'medium'
 end between 'high' and 'high'
-order by 1,2,3,4;
+order by 1,2,3,4;
+
+--CTE test
+create table cte_test(w_zip text);
+
+create table cte_test2(w_name text);
+
+create table cte_test3(d_id text);
+
+with alias1 as (select w_zip alias2 from cte_test) select w_name from cte_test2 union select d_id from cte_test3 full join alias1 on cte_test3.d_id>alias1.alias2;
+
+-- CTE test with smp
+set query_dop = 4;
+with alias1 as (select w_zip alias2 from cte_test) select w_name from cte_test2 union select d_id from cte_test3 full join alias1 on cte_test3.d_id>alias1.alias2;
+
+drop table cte_test;
+drop table cte_test2;
+drop table cte_test3;