diff --git a/src/gausskernel/optimizer/plan/planner.cpp b/src/gausskernel/optimizer/plan/planner.cpp
index c9a263e21..a889baffa 100755
--- a/src/gausskernel/optimizer/plan/planner.cpp
+++ b/src/gausskernel/optimizer/plan/planner.cpp
@@ -1720,7 +1720,10 @@ Plan* subquery_planner(PlannerGlobal* glob, Query* parse, PlannerInfo* parent_ro
     if (hasOuterJoins) {
         reduce_outer_joins(root);
         DEBUG_QRW("After outer-to-inner conversion");
-        if (IS_STREAM_PLAN) {
+#ifdef ENABLE_MULTIPLE_NODES
+        if (IS_STREAM_PLAN)
+#endif
+        {
             bool support_rewrite = true;
             if (!fulljoin_2_left_union_right_anti_support(root->parse))
                 support_rewrite = false;
diff --git a/src/gausskernel/optimizer/prep/prepjointree.cpp b/src/gausskernel/optimizer/prep/prepjointree.cpp
index 2e1fae2f1..ea536a260 100755
--- a/src/gausskernel/optimizer/prep/prepjointree.cpp
+++ b/src/gausskernel/optimizer/prep/prepjointree.cpp
@@ -3369,8 +3369,9 @@ void reduce_inequality_fulljoins(PlannerInfo* root)
  */
 static Node* reduce_inequality_fulljoins_jointree_recurse(PlannerInfo* root, Node* jtnode)
 {
+#ifdef ENABLE_MULTIPLE_NODES
     Assert(IS_STREAM_PLAN);
-
+#endif
     if (jtnode == NULL || IsA(jtnode, RangeTblRef)) {
         return jtnode; /* jtnode is returned unmodified */
     } else if (IsA(jtnode, FromExpr)) {
diff --git a/src/test/regress/expected/join_test_alias.out b/src/test/regress/expected/join_test_alias.out
index da5494779..862195a09 100644
--- a/src/test/regress/expected/join_test_alias.out
+++ b/src/test/regress/expected/join_test_alias.out
@@ -53,3 +53,108 @@ on T5.issue_type=T6.is_type
             | 首发
 (2 rows)
 
+-- full join with non-equal condition
+create table fulljointest(c1 int,c2 varchar2(20),c3 varchar2(20),c4 int);
+insert into fulljointest values(1,'li','adjani',100);
+insert into fulljointest values(2,'li','adjani',2000);
+insert into fulljointest values(3,'li','adjani',5000);
+set query_dop=1;
+explain(costs off) select * from fulljointest t1 full join fulljointest t2 on case t2.c4 when 100 then 'low'
+when 5000 then 'high'
+when 2000 then 'medium'
+end between 'high' and 'high'
+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;
+                                                                                                                                                       QUERY PLAN                                                                                                                                                        
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
+ Sort
+   Sort Key: t1.c1, t1.c2, t1.c3, t1.c4
+   ->  Nested Loop
+         ->  Result
+               ->  Append
+                     ->  Nested Loop Left Join
+                           ->  Seq Scan on fulljointest t1
+                           ->  Materialize
+                                 ->  Seq Scan on fulljointest t2
+                                       Filter: ((CASE c4 WHEN 100 THEN 'low'::text WHEN 5000 THEN 'high'::text WHEN 2000 THEN 'medium'::text ELSE NULL::text END >= 'high'::text) AND (CASE c4 WHEN 100 THEN 'low'::text WHEN 5000 THEN 'high'::text WHEN 2000 THEN 'medium'::text ELSE NULL::text END <= 'high'::text))
+                     ->  Nested Loop Left Anti Full Join
+                           Join Filter: ((CASE t2.c4 WHEN 100 THEN 'low'::text WHEN 5000 THEN 'high'::text WHEN 2000 THEN 'medium'::text ELSE NULL::text END >= 'high'::text) AND (CASE t2.c4 WHEN 100 THEN 'low'::text WHEN 5000 THEN 'high'::text WHEN 2000 THEN 'medium'::text ELSE NULL::text END <= 'high'::text))
+                           ->  Seq Scan on fulljointest t2
+                           ->  Materialize
+                                 ->  Seq Scan on fulljointest t1
+         ->  Materialize
+               ->  Seq Scan on fulljointest t3
+                     Filter: ((CASE c4 WHEN 100 THEN 'low'::text WHEN 5000 THEN 'high'::text WHEN 2000 THEN 'medium'::text ELSE NULL::text END >= 'high'::text) AND (CASE c4 WHEN 100 THEN 'low'::text WHEN 5000 THEN 'high'::text WHEN 2000 THEN 'medium'::text ELSE NULL::text END <= 'high'::text))
+(18 rows)
+
+select * from fulljointest t1 full join fulljointest t2 on case t2.c4 when 100 then 'low'
+when 5000 then 'high'
+when 2000 then 'medium'
+end between 'high' and 'high'
+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;
+ c1 | c2 |   c3   |  c4  | c1 | c2 |   c3   |  c4  | c1 | c2 |   c3   |  c4  
+----+----+--------+------+----+----+--------+------+----+----+--------+------
+  1 | li | adjani |  100 |  3 | li | adjani | 5000 |  3 | li | adjani | 5000
+  2 | li | adjani | 2000 |  3 | li | adjani | 5000 |  3 | li | adjani | 5000
+  3 | li | adjani | 5000 |  3 | li | adjani | 5000 |  3 | li | adjani | 5000
+    |    |        |      |  1 | li | adjani |  100 |  3 | li | adjani | 5000
+    |    |        |      |  2 | li | adjani | 2000 |  3 | li | adjani | 5000
+(5 rows)
+
+set query_dop=4;
+explain(costs off) select * from fulljointest t1 full join fulljointest t2 on case t2.c4 when 100 then 'low'
+when 5000 then 'high'
+when 2000 then 'medium'
+end between 'high' and 'high'
+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;
+                                                                                                                                                       QUERY PLAN                                                                                                                                                        
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
+ Sort
+   Sort Key: t1.c1, t1.c2, t1.c3, t1.c4
+   ->  Nested Loop
+         ->  Result
+               ->  Append
+                     ->  Nested Loop Left Join
+                           ->  Seq Scan on fulljointest t1
+                           ->  Materialize
+                                 ->  Seq Scan on fulljointest t2
+                                       Filter: ((CASE c4 WHEN 100 THEN 'low'::text WHEN 5000 THEN 'high'::text WHEN 2000 THEN 'medium'::text ELSE NULL::text END >= 'high'::text) AND (CASE c4 WHEN 100 THEN 'low'::text WHEN 5000 THEN 'high'::text WHEN 2000 THEN 'medium'::text ELSE NULL::text END <= 'high'::text))
+                     ->  Nested Loop Left Anti Full Join
+                           Join Filter: ((CASE t2.c4 WHEN 100 THEN 'low'::text WHEN 5000 THEN 'high'::text WHEN 2000 THEN 'medium'::text ELSE NULL::text END >= 'high'::text) AND (CASE t2.c4 WHEN 100 THEN 'low'::text WHEN 5000 THEN 'high'::text WHEN 2000 THEN 'medium'::text ELSE NULL::text END <= 'high'::text))
+                           ->  Seq Scan on fulljointest t2
+                           ->  Materialize
+                                 ->  Seq Scan on fulljointest t1
+         ->  Materialize
+               ->  Seq Scan on fulljointest t3
+                     Filter: ((CASE c4 WHEN 100 THEN 'low'::text WHEN 5000 THEN 'high'::text WHEN 2000 THEN 'medium'::text ELSE NULL::text END >= 'high'::text) AND (CASE c4 WHEN 100 THEN 'low'::text WHEN 5000 THEN 'high'::text WHEN 2000 THEN 'medium'::text ELSE NULL::text END <= 'high'::text))
+(18 rows)
+
+select * from fulljointest t1 full join fulljointest t2 on case t2.c4 when 100 then 'low'
+when 5000 then 'high'
+when 2000 then 'medium'
+end between 'high' and 'high'
+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;
+ c1 | c2 |   c3   |  c4  | c1 | c2 |   c3   |  c4  | c1 | c2 |   c3   |  c4  
+----+----+--------+------+----+----+--------+------+----+----+--------+------
+  1 | li | adjani |  100 |  3 | li | adjani | 5000 |  3 | li | adjani | 5000
+  2 | li | adjani | 2000 |  3 | li | adjani | 5000 |  3 | li | adjani | 5000
+  3 | li | adjani | 5000 |  3 | li | adjani | 5000 |  3 | li | adjani | 5000
+    |    |        |      |  1 | li | adjani |  100 |  3 | li | adjani | 5000
+    |    |        |      |  2 | li | adjani | 2000 |  3 | li | adjani | 5000
+(5 rows)
+
diff --git a/src/test/regress/sql/join_test_alias.sql b/src/test/regress/sql/join_test_alias.sql
index e57761476..64c5ac9e4 100644
--- a/src/test/regress/sql/join_test_alias.sql
+++ b/src/test/regress/sql/join_test_alias.sql
@@ -50,4 +50,53 @@ ELSE '增发'::text
 END AS is_type from t33
 )T6
 on T5.issue_type=T6.is_type
-;
\ No newline at end of file
+;
+
+-- full join with non-equal condition
+create table fulljointest(c1 int,c2 varchar2(20),c3 varchar2(20),c4 int);
+insert into fulljointest values(1,'li','adjani',100);
+insert into fulljointest values(2,'li','adjani',2000);
+insert into fulljointest values(3,'li','adjani',5000);
+
+set query_dop=1;
+
+explain(costs off) select * from fulljointest t1 full join fulljointest t2 on case t2.c4 when 100 then 'low'
+when 5000 then 'high'
+when 2000 then 'medium'
+end between 'high' and 'high'
+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;
+
+select * from fulljointest t1 full join fulljointest t2 on case t2.c4 when 100 then 'low'
+when 5000 then 'high'
+when 2000 then 'medium'
+end between 'high' and 'high'
+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;
+
+set query_dop=4;
+explain(costs off) select * from fulljointest t1 full join fulljointest t2 on case t2.c4 when 100 then 'low'
+when 5000 then 'high'
+when 2000 then 'medium'
+end between 'high' and 'high'
+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;
+
+select * from fulljointest t1 full join fulljointest t2 on case t2.c4 when 100 then 'low'
+when 5000 then 'high'
+when 2000 then 'medium'
+end between 'high' and 'high'
+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;
\ No newline at end of file