diff --git a/src/test/regress/expected/gp_optimizer.out b/src/test/regress/expected/gp_optimizer.out
index 4e4f41d5ec8f2402b1ed16fa32b5f356d25133ba..d05c0824f8ed46a058c2b7529c67b2a82abd885f 100644
--- a/src/test/regress/expected/gp_optimizer.out
+++ b/src/test/regress/expected/gp_optimizer.out
@@ -8131,6 +8131,22 @@ select * from orca.t order by 1,2;
  201208 |       2 | tag1  | tag2 
 (7 rows)
 
+-- test EXPLAIN support of partition selection nodes, while we're at it.
+explain select * from orca.t order by 1,2;
+                                             QUERY PLAN                                              
+-----------------------------------------------------------------------------------------------------
+ Gather Motion 2:1  (slice1; segments: 2)  (cost=0.00..431.00 rows=1 width=32)
+   Merge Key: timest, user_id
+   ->  Sequence  (cost=0.00..431.00 rows=1 width=32)
+         ->  Partition Selector for t (dynamic scan id: 1)  (cost=10.00..100.00 rows=50 width=4)
+               Partitions selected:  6 (out of 6)
+         ->  Sort  (cost=0.00..431.00 rows=1 width=32)
+               Sort Key: timest, user_id
+               ->  Dynamic Table Scan on t (dynamic scan id: 1)  (cost=0.00..431.00 rows=1 width=32)
+ Settings:  optimizer=on; optimizer_segments=3
+ Optimizer status: PQO version 1.630
+(10 rows)
+
 select tag2, tag1 from orca.t order by 1, 2;;
  tag2  | tag1  
 -------+-------
diff --git a/src/test/regress/expected/gp_optimizer_1.out b/src/test/regress/expected/gp_optimizer_1.out
index 01b760460a8014d8c1d7e760caefe6ce79ce9c39..0f6858f8ba59db622be71f6c9c5b1bb49967793f 100644
--- a/src/test/regress/expected/gp_optimizer_1.out
+++ b/src/test/regress/expected/gp_optimizer_1.out
@@ -8132,6 +8132,24 @@ select * from orca.t order by 1,2;
  201208 |       2 | tag1  | tag2 
 (7 rows)
 
+-- test EXPLAIN support of partition selection nodes, while we're at it.
+explain select * from orca.t order by 1,2;
+                                                  QUERY PLAN                                                  
+--------------------------------------------------------------------------------------------------------------
+ Gather Motion 2:1  (slice1; segments: 2)  (cost=16113.11..16515.11 rows=160800 width=92)
+   Merge Key: orca.t.timest, orca.t.user_id
+   ->  Sort  (cost=16113.11..16515.11 rows=80400 width=92)
+         Sort Key: orca.t.timest, orca.t.user_id
+         ->  Append  (cost=0.00..2208.00 rows=80400 width=92)
+               ->  Append-only Columnar Scan on t_1_prt_part201203 t  (cost=0.00..368.00 rows=13400 width=92)
+               ->  Append-only Scan on t_1_prt_part201204 t  (cost=0.00..368.00 rows=13400 width=92)
+               ->  Seq Scan on t_1_prt_part201205 t  (cost=0.00..368.00 rows=13400 width=92)
+               ->  Append-only Columnar Scan on t_1_prt_part201206 t  (cost=0.00..368.00 rows=13400 width=92)
+               ->  Append-only Scan on t_1_prt_part201207 t  (cost=0.00..368.00 rows=13400 width=92)
+               ->  Seq Scan on t_1_prt_part201208 t  (cost=0.00..368.00 rows=13400 width=92)
+ Settings:  optimizer=off; optimizer_segments=3
+(12 rows)
+
 select tag2, tag1 from orca.t order by 1, 2;;
  tag2  | tag1  
 -------+-------
diff --git a/src/test/regress/sql/gp_optimizer.sql b/src/test/regress/sql/gp_optimizer.sql
index fef0b20b9073545894a802e4ae5f08b812cbd3c8..87cd50cc6169f2efa915afa33cb12dc0cb8fcfbc 100644
--- a/src/test/regress/sql/gp_optimizer.sql
+++ b/src/test/regress/sql/gp_optimizer.sql
@@ -475,6 +475,9 @@ insert into orca.t values('201208',2,'tag1','tag2');
 -- test projections
 select * from orca.t order by 1,2;
 
+-- test EXPLAIN support of partition selection nodes, while we're at it.
+explain select * from orca.t order by 1,2;
+
 select tag2, tag1 from orca.t order by 1, 2;;
 
 select tag1, user_id from orca.t order by 1, 2;