QUERY PLAN                                                                    
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 Merge Join  (cost=1.88..117183.33 rows=1593920 width=4) (actual time=0.090..4127.465 rows=1604080 loops=1)
   Merge Cond: (part.p_partkey = t.ps_partkey)
   ->  Index Only Scan using part_pkey on part  (cost=0.43..51948.26 rows=1999989 width=4) (actual time=0.038..928.974 rows=2000000 loops=1)
         Heap Fetches: 0
   ->  Index Only Scan using t_ps_partkey_idx on t  (cost=0.43..40321.23 rows=1593920 width=4) (actual time=0.032..870.579 rows=1604080 loops=1)
         Heap Fetches: 0
 Planning Time: 0.567 ms
 Execution Time: 4795.921 ms
(8 rows)