QUERY PLAN                                  
-----------------------------------------------------------------------------
 Nested Loop  (cost=xxx rows=1000 width=30)
   ->  Seq Scan on t1 v1t1  (cost=xxx rows=1000 width=15)
   ->  Index Scan using t1_i1 on t1 v1t1_  (cost=xxx rows=1 width=15)
         Index Cond: (c1 = v1t1.c1)
(4 rows)

                                 QUERY PLAN                                  
-----------------------------------------------------------------------------
 Nested Loop  (cost=xxx rows=1 width=30)
   ->  Seq Scan on t1 v1t1  (cost=xxx rows=1000 width=15)
   ->  Index Scan using t1_i1 on t1 v1t1_  (cost=xxx rows=1 width=15)
         Index Cond: (c1 = v1t1.c1)
(4 rows)