QUERY PLAN                                            
--------------------------------------------------------------------------------------------------
 Merge Join  (cost=xxx rows=100 width=29)
   Merge Cond: (t1.c1 = t2.c1)
   InitPlan 1 (returns $0)
     ->  Aggregate  (cost=xxx rows=1 width=4)
           ->  Merge Join  (cost=xxx rows=100 width=4)
                 Merge Cond: (t1_1.c1 = t2_1.c1)
                 ->  Index Only Scan using t1_i1 on t1 t1_1  (cost=xxx rows=1000 width=4)
                 ->  Sort  (cost=xxx rows=100 width=4)
                       Sort Key: t2_1.c1
                       ->  Seq Scan on t2 t2_1  (cost=xxx rows=100 width=4)
   ->  Index Scan using t1_i1 on t1  (cost=xxx rows=1000 width=15)
   ->  Sort  (cost=xxx rows=100 width=14)
         Sort Key: t2.c1
         ->  Seq Scan on t2  (cost=xxx rows=100 width=14)
(14 rows)

                                            QUERY PLAN                                            
--------------------------------------------------------------------------------------------------
 Merge Join  (cost=xxx rows=100 width=29)
   Merge Cond: (t1.c1 = t2.c1)
   InitPlan 1 (returns $0)
     ->  Aggregate  (cost=xxx rows=1 width=4)
           ->  Merge Join  (cost=xxx rows=1 width=4)
                 Merge Cond: (t1_1.c1 = t2_1.c1)
                 ->  Index Only Scan using t1_i1 on t1 t1_1  (cost=xxx rows=1000 width=4)
                 ->  Sort  (cost=xxx rows=100 width=4)
                       Sort Key: t2_1.c1
                       ->  Seq Scan on t2 t2_1  (cost=xxx rows=100 width=4)
   ->  Index Scan using t1_i1 on t1  (cost=xxx rows=1000 width=15)
   ->  Sort  (cost=xxx rows=100 width=14)
         Sort Key: t2.c1
         ->  Seq Scan on t2  (cost=xxx rows=100 width=14)
(14 rows)

                                           QUERY PLAN                                            
-------------------------------------------------------------------------------------------------
 Merge Join  (cost=xxx rows=1 width=29)
   Merge Cond: (t1.c1 = t2.c1)
   InitPlan 1 (returns $0)
     ->  Aggregate  (cost=xxx rows=1 width=4)
           ->  Merge Join  (cost=xxx rows=1 width=4)
                 Merge Cond: (st1.c1 = st2.c1)
                 ->  Index Only Scan using t1_i1 on t1 st1  (cost=xxx rows=1000 width=4)
                 ->  Sort  (cost=xxx rows=100 width=4)
                       Sort Key: st2.c1
                       ->  Seq Scan on t2 st2  (cost=xxx rows=100 width=4)
   ->  Index Scan using t1_i1 on t1  (cost=xxx rows=1000 width=15)
   ->  Sort  (cost=xxx rows=100 width=14)
         Sort Key: t2.c1
         ->  Seq Scan on t2  (cost=xxx rows=100 width=14)
(14 rows)