diff --git a/src/test/regress/expected/subselect.out b/src/test/regress/expected/subselect.out
index cc3f5f3737..1b09b3e3fd 100644
--- a/src/test/regress/expected/subselect.out
+++ b/src/test/regress/expected/subselect.out
@@ -830,6 +830,20 @@ explain (verbose, costs off)
                  One-Time Filter: ("*VALUES*".column1 = "*VALUES*".column1)
 (8 rows)
 
+--
+-- Check we don't filter NULL outer rows in a NOT IN where the subquery
+-- returns no rows.
+--
+create temp table notinouter (a int);
+create temp table notininner (a int not null);
+insert into notinouter values(null),(1);
+select * from notinouter where a not in(select a from notininner);
+ a 
+---
+  
+ 1
+(2 rows)
+
 --
 -- Check we behave sanely in corner case of empty SELECT list (bug #8648)
 --
diff --git a/src/test/regress/sql/subselect.sql b/src/test/regress/sql/subselect.sql
index 8bca1f5d55..48230d4671 100644
--- a/src/test/regress/sql/subselect.sql
+++ b/src/test/regress/sql/subselect.sql
@@ -466,6 +466,16 @@ explain (verbose, costs off)
   select x, x from
     (select (select random() where y=y) as x from (values(1),(2)) v(y)) ss;
 
+--
+-- Check we don't filter NULL outer rows in a NOT IN where the subquery
+-- returns no rows.
+--
+create temp table notinouter (a int);
+create temp table notininner (a int not null);
+insert into notinouter values(null),(1);
+
+select * from notinouter where a not in(select a from notininner);
+
 --
 -- Check we behave sanely in corner case of empty SELECT list (bug #8648)
 --