diff --git a/src/backend/optimizer/path/joinpath.c b/src/backend/optimizer/path/joinpath.c
index 41b60d0..58078b5 100644
--- a/src/backend/optimizer/path/joinpath.c
+++ b/src/backend/optimizer/path/joinpath.c
@@ -1450,10 +1450,15 @@ hash_inner_and_outer(PlannerInfo *root,
 		 * If the joinrel is parallel-safe, we may be able to consider a
 		 * partial hash join.  However, we can't handle JOIN_UNIQUE_OUTER,
 		 * because the outer path will be partial, and therefore we won't be
-		 * able to properly guarantee uniqueness.  Also, the resulting path
+		 * able to properly guarantee uniqueness. Similarly we can't handle
+		 * JOIN_FULL and JOIN_RIGHT because they can produce false null
+		 * extended rows as outer path is partial. Also, the resulting path
 		 * must not be parameterized.
 		 */
-		if (joinrel->consider_parallel && jointype != JOIN_UNIQUE_OUTER &&
+		if (joinrel->consider_parallel &&
+			jointype != JOIN_UNIQUE_OUTER &&
+			jointype != JOIN_FULL &&
+			jointype != JOIN_RIGHT &&
 			outerrel->partial_pathlist != NIL &&
 			bms_is_empty(joinrel->lateral_relids))
 		{
diff --git a/src/test/regress/expected/join.out b/src/test/regress/expected/join.out
index cafbc5e..e2028d4 100644
--- a/src/test/regress/expected/join.out
+++ b/src/test/regress/expected/join.out
@@ -5260,3 +5260,30 @@ ERROR:  invalid reference to FROM-clause entry for table "xx1"
 LINE 1: ...xx1 using lateral (select * from int4_tbl where f1 = x1) ss;
                                                                 ^
 HINT:  There is an entry for table "xx1", but it cannot be referenced from this part of the query.
+-- avoid parallel full and right join path.
+create table mytab(x int,x1 char(20),x2 varchar(9));
+create table mytab1(y int,y1 char(20),y2 varchar(9));
+insert into mytab values (generate_series(1,200000),'aaaaaaaaaaaaaaaa','aaaaaaaaa');
+insert into mytab1 values (generate_series(1,100000),'aaaaaaaaaaaaaaaa','aaaaaaaaa');
+analyze mytab;
+analyze mytab1;
+select count(*) FROM mytab right outer join mytab1 ON mytab.x = mytab1.y;
+ count  
+--------
+ 100000
+(1 row)
+
+select count(*) FROM mytab full outer join mytab1 ON mytab.x = mytab1.y;
+ count  
+--------
+ 200000
+(1 row)
+
+select count(*) FROM mytab left outer join mytab1 ON mytab.x = mytab1.y;
+ count  
+--------
+ 200000
+(1 row)
+
+drop table mytab;
+drop table mytab1;
diff --git a/src/test/regress/sql/join.sql b/src/test/regress/sql/join.sql
index 3430f91..52d29c4 100644
--- a/src/test/regress/sql/join.sql
+++ b/src/test/regress/sql/join.sql
@@ -1696,3 +1696,17 @@ update xx1 set x2 = f1 from xx1, lateral (select * from int4_tbl where f1 = x1)
 delete from xx1 using (select * from int4_tbl where f1 = x1) ss;
 delete from xx1 using (select * from int4_tbl where f1 = xx1.x1) ss;
 delete from xx1 using lateral (select * from int4_tbl where f1 = x1) ss;
+
+-- avoid parallel full and right join path.
+create table mytab(x int,x1 char(20),x2 varchar(9));
+create table mytab1(y int,y1 char(20),y2 varchar(9));
+insert into mytab values (generate_series(1,200000),'aaaaaaaaaaaaaaaa','aaaaaaaaa');
+insert into mytab1 values (generate_series(1,100000),'aaaaaaaaaaaaaaaa','aaaaaaaaa');
+analyze mytab;
+analyze mytab1;
+select count(*) FROM mytab right outer join mytab1 ON mytab.x = mytab1.y;
+select count(*) FROM mytab full outer join mytab1 ON mytab.x = mytab1.y;
+select count(*) FROM mytab left outer join mytab1 ON mytab.x = mytab1.y;
+
+drop table mytab;
+drop table mytab1;