2 -------------------------------------------------------------------------------
3 Merge Join (cost=xxx rows=1 width=29)
4 Merge Cond: (t_1.c1 = t_2.c1)
5 -> Index Scan using t1_i1 on t1 t_1 (cost=xxx rows=1000 width=15)
6 -> Sort (cost=xxx rows=100 width=14)
8 -> Seq Scan on t2 t_2 (cost=xxx rows=100 width=14)