diff --git a/src/backend/optimizer/path/joinpath.c b/src/backend/optimizer/path/joinpath.c
index c762ec61fbe..c12317b2a89 100644
--- a/src/backend/optimizer/path/joinpath.c
+++ b/src/backend/optimizer/path/joinpath.c
@@ -2299,7 +2299,6 @@ hash_inner_and_outer(PlannerInfo *root,
 			save_jointype != JOIN_UNIQUE_OUTER &&
 			save_jointype != JOIN_FULL &&
 			save_jointype != JOIN_RIGHT &&
-			save_jointype != JOIN_LASJ_NOTIN &&
 			save_jointype != JOIN_DEDUP_SEMI &&
 			save_jointype != JOIN_DEDUP_SEMI_REVERSE &&
 			outerrel->partial_pathlist != NIL &&
@@ -2319,6 +2318,7 @@ hash_inner_and_outer(PlannerInfo *root,
 			 */
 			if (innerrel->partial_pathlist != NIL &&
 				save_jointype != JOIN_UNIQUE_INNER &&
+				save_jointype != JOIN_LASJ_NOTIN &&
 				enable_parallel_hash)
 			{
 				cheapest_partial_inner =
diff --git a/src/test/regress/expected/gp_parallel.out b/src/test/regress/expected/gp_parallel.out
index 21031b2accc..23bba396d3d 100644
--- a/src/test/regress/expected/gp_parallel.out
+++ b/src/test/regress/expected/gp_parallel.out
@@ -1590,6 +1590,81 @@ select * from t1 order by c2 asc limit 3 offset 5;
 
 abort;
 --
+-- Test Parallel Hash Left Anti Semi (Not-In) Join(parallel-oblivious).
+--
+create table t1(c1 int, c2 int) using ao_row distributed by (c1);
+create table t2(c1 int, c2 int) using ao_row distributed by (c1);
+create table t3_null(c1 int, c2 int) using ao_row distributed by (c1);
+set enable_parallel = on;
+set gp_appendonly_insert_files = 2;
+set gp_appendonly_insert_files_tuples_range = 100;
+set max_parallel_workers_per_gather = 2;
+insert into t1 select i, i from generate_series(1, 5000000) i;
+insert into t2 select i+1, i from generate_series(1, 1200) i;
+insert into t3_null select i+1, i from generate_series(1, 1200) i;
+insert into t3_null values(NULL, NULL);
+analyze t1;
+analyze t2;
+analyze t3_null;
+explain(costs off) select sum(t1.c1) from t1 where c1 not in (select c1 from t2);
+                                QUERY PLAN                                 
+---------------------------------------------------------------------------
+ Finalize Aggregate
+   ->  Gather Motion 6:1  (slice1; segments: 6)
+         ->  Partial Aggregate
+               ->  Hash Left Anti Semi (Not-In) Join
+                     Hash Cond: (t1.c1 = t2.c1)
+                     ->  Parallel Seq Scan on t1
+                     ->  Hash
+                           ->  Broadcast Motion 3:6  (slice2; segments: 3)
+                                 ->  Seq Scan on t2
+ Optimizer: Postgres query optimizer
+(10 rows)
+
+select sum(t1.c1) from t1 where c1 not in (select c1 from t2);
+      sum       
+----------------
+ 12500001778200
+(1 row)
+
+explain(costs off) select * from t1 where c1 not in (select c1 from t3_null);
+                          QUERY PLAN                           
+---------------------------------------------------------------
+ Gather Motion 6:1  (slice1; segments: 6)
+   ->  Hash Left Anti Semi (Not-In) Join
+         Hash Cond: (t1.c1 = t3_null.c1)
+         ->  Parallel Seq Scan on t1
+         ->  Hash
+               ->  Broadcast Motion 3:6  (slice2; segments: 3)
+                     ->  Seq Scan on t3_null
+ Optimizer: Postgres query optimizer
+(8 rows)
+
+select * from t1 where c1 not in (select c1 from t3_null);
+ c1 | c2 
+----+----
+(0 rows)
+
+-- non-parallel results.
+set enable_parallel = off;
+select sum(t1.c1) from t1 where c1 not in (select c1 from t2);
+      sum       
+----------------
+ 12500001778200
+(1 row)
+
+select * from t1 where c1 not in (select c1 from t3_null);
+ c1 | c2 
+----+----
+(0 rows)
+
+drop table t1;
+drop table t2;
+drop table t3_null;
+--
+-- End of Test Parallel Hash Left Anti Semi (Not-In) Join.
+--
+--
 -- Test alter ao/aocs table parallel_workers options
 --
 begin;
diff --git a/src/test/regress/sql/gp_parallel.sql b/src/test/regress/sql/gp_parallel.sql
index e6fd9657e86..6feaeaa4117 100644
--- a/src/test/regress/sql/gp_parallel.sql
+++ b/src/test/regress/sql/gp_parallel.sql
@@ -465,6 +465,39 @@ set local enable_parallel = off;
 explain(costs off, locus) select * from t1 order by c2 asc limit 3 offset 5;
 select * from t1 order by c2 asc limit 3 offset 5;
 abort;
+
+--
+-- Test Parallel Hash Left Anti Semi (Not-In) Join(parallel-oblivious).
+--
+create table t1(c1 int, c2 int) using ao_row distributed by (c1);
+create table t2(c1 int, c2 int) using ao_row distributed by (c1);
+create table t3_null(c1 int, c2 int) using ao_row distributed by (c1);
+set enable_parallel = on;
+set gp_appendonly_insert_files = 2;
+set gp_appendonly_insert_files_tuples_range = 100;
+set max_parallel_workers_per_gather = 2;
+insert into t1 select i, i from generate_series(1, 5000000) i;
+insert into t2 select i+1, i from generate_series(1, 1200) i;
+insert into t3_null select i+1, i from generate_series(1, 1200) i;
+insert into t3_null values(NULL, NULL);
+analyze t1;
+analyze t2;
+analyze t3_null;
+explain(costs off) select sum(t1.c1) from t1 where c1 not in (select c1 from t2);
+select sum(t1.c1) from t1 where c1 not in (select c1 from t2);
+explain(costs off) select * from t1 where c1 not in (select c1 from t3_null);
+select * from t1 where c1 not in (select c1 from t3_null);
+-- non-parallel results.
+set enable_parallel = off;
+select sum(t1.c1) from t1 where c1 not in (select c1 from t2);
+select * from t1 where c1 not in (select c1 from t3_null);
+drop table t1;
+drop table t2;
+drop table t3_null;
+--
+-- End of Test Parallel Hash Left Anti Semi (Not-In) Join.
+--
+
 --
 -- Test alter ao/aocs table parallel_workers options
 --