BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	nation,
	o_year,
	sum(amount) as sum_profit
from
	(
		select
			n_name as nation,
			extract(year from o_orderdate) as o_year,
			l_extendedprice * (1 - l_discount) - ps_supplycost * l_quantity as amount
		from
			part,
			supplier,
			lineitem,
			partsupp,
			orders,
			nation
		where
			s_suppkey = l_suppkey
			and ps_suppkey = l_suppkey
			and ps_partkey = l_partkey
			and p_partkey = l_partkey
			and o_orderkey = l_orderkey
			and s_nationkey = n_nationkey
			and p_name like '%drab%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                  QUERY PLAN                                                                                   
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=3385602.00..3385606.44 rows=127 width=46) (actual time=246915.370..250423.208 rows=175 loops=1)
   Buffers: shared hit=30472577 read=611751 dirtied=16 written=1633
   ->  Sort  (cost=3385602.00..3385602.31 rows=127 width=46) (actual time=246901.779..248139.737 rows=3278228 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 559305kB
         Buffers: shared hit=30472577 read=611751 dirtied=16 written=1633
         ->  Nested Loop  (cost=2718216.68..3385597.56 rows=127 width=46) (actual time=115698.528..224778.934 rows=3278228 loops=1)
               Buffers: shared hit=30472569 read=611751 dirtied=16 written=1633
               ->  Nested Loop  (cost=2718216.68..3385561.34 rows=127 width=24) (actual time=115698.436..207685.954 rows=3278228 loops=1)
                     Buffers: shared hit=23916113 read=611751 dirtied=16 written=1633
                     ->  Nested Loop  (cost=2718216.68..3385312.66 rows=127 width=24) (actual time=115698.382..147526.022 rows=3278228 loops=1)
                           Buffers: shared hit=10970815 read=426073 written=181
                           ->  Merge Join  (cost=2718216.68..3385275.39 rows=128 width=28) (actual time=115698.275..127631.956 rows=3278228 loops=1)
                                 Merge Cond: ((partsupp.ps_partkey = lineitem.l_partkey) AND (partsupp.ps_suppkey = lineitem.l_suppkey))
                                 Buffers: shared hit=1118326 read=426073 written=181
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..603091.33 rows=8000000 width=12) (actual time=0.014..5393.556 rows=7999889 loops=1)
                                       Buffers: shared hit=366717 read=67488 written=178
                                 ->  Sort  (cost=2718216.67..2726205.38 rows=3195484 width=28) (actual time=115698.133..118214.266 rows=3278228 loops=1)
                                       Sort Key: part.p_partkey, lineitem.l_suppkey
                                       Sort Method: quicksort  Memory: 354416kB
                                       Buffers: shared hit=751609 read=358585 written=3
                                       ->  Hash Join  (cost=66848.46..2372982.92 rows=3195484 width=28) (actual time=1721.515..111844.619 rows=3278228 loops=1)
                                             Hash Cond: (lineitem.l_partkey = part.p_partkey)
                                             Buffers: shared hit=751606 read=358585 written=3
                                             ->  Seq Scan on lineitem  (cost=0.00..1671922.81 rows=60225681 width=24) (actual time=0.045..21558.633 rows=60045303 loops=1)
                                                   Buffers: shared hit=742172 read=327494 written=3
                                             ->  Hash  (cost=65522.00..65522.00 rows=106117 width=4) (actual time=1721.267..1721.267 rows=109161 loops=1)
                                                   Buckets: 16384  Batches: 1  Memory Usage: 3838kB
                                                   Buffers: shared hit=9431 read=31091
                                                   ->  Seq Scan on part  (cost=0.00..65522.00 rows=106117 width=4) (actual time=0.034..1639.536 rows=109161 loops=1)
                                                         Filter: ((p_name)::text ~~ '%drab%'::text)
                                                         Rows Removed by Filter: 1890839
                                                         Buffers: shared hit=9431 read=31091
                           ->  Index Scan using pk_supplier on supplier  (cost=0.00..0.28 rows=1 width=8) (actual time=0.005..0.005 rows=1 loops=3278228)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9852489
                     ->  Index Scan using pk_orders on orders  (cost=0.00..1.95 rows=1 width=8) (actual time=0.017..0.017 rows=1 loops=3278228)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=12945298 read=185678 dirtied=16 written=1452
               ->  Index Scan using pk_nation on nation  (cost=0.00..0.27 rows=1 width=30) (actual time=0.003..0.003 rows=1 loops=3278228)
                     Index Cond: (n_nationkey = supplier.s_nationkey)
                     Buffers: shared hit=6556456
 Total runtime: 250566.677 ms
(43 rows)

COMMIT;
COMMIT