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 '%white%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                   QUERY PLAN                                                                                   
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=3369431.55..3369435.79 rows=121 width=46) (actual time=705067.065..708512.547 rows=175 loops=1)
   Buffers: shared hit=30362176 read=671457 dirtied=12 written=2101
   ->  Sort  (cost=3369431.55..3369431.85 rows=121 width=46) (actual time=705053.762..706028.620 rows=3272294 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 558471kB
         Buffers: shared hit=30362176 read=671457 dirtied=12 written=2101
         ->  Nested Loop  (cost=2703353.30..3369427.37 rows=121 width=46) (actual time=201133.502..683121.167 rows=3272294 loops=1)
               Buffers: shared hit=30362168 read=671457 dirtied=12 written=2101
               ->  Nested Loop  (cost=2703353.30..3369392.86 rows=121 width=24) (actual time=201133.063..565242.445 rows=3272294 loops=1)
                     Buffers: shared hit=23817580 read=671457 dirtied=12 written=2101
                     ->  Nested Loop  (cost=2703353.30..3369154.74 rows=121 width=24) (actual time=201133.013..346196.920 rows=3272294 loops=1)
                           Buffers: shared hit=10770924 read=611133 written=1426
                           ->  Merge Join  (cost=2703353.30..3369119.51 rows=121 width=28) (actual time=201132.957..227318.077 rows=3272294 loops=1)
                                 Merge Cond: ((partsupp.ps_partkey = lineitem.l_partkey) AND (partsupp.ps_suppkey = lineitem.l_suppkey))
                                 Buffers: shared hit=936459 read=611133 written=1426
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..603091.29 rows=8000000 width=12) (actual time=0.009..17271.092 rows=7999933 loops=1)
                                       Buffers: shared hit=317755 read=116453 written=1424
                                 ->  Sort  (cost=2703353.28..2710911.21 rows=3023170 width=28) (actual time=201132.700..204459.415 rows=3272294 loops=1)
                                       Sort Key: part.p_partkey, lineitem.l_suppkey
                                       Sort Method: quicksort  Memory: 353952kB
                                       Buffers: shared hit=618704 read=494680 written=2
                                       ->  Hash Join  (cost=66773.23..2377944.85 rows=3023170 width=28) (actual time=4421.710..196775.730 rows=3272294 loops=1)
                                             Hash Cond: (lineitem.l_partkey = part.p_partkey)
                                             Buffers: shared hit=618701 read=494680 written=2
                                             ->  Seq Scan on lineitem  (cost=0.00..1676897.96 rows=60404196 width=24) (actual time=0.041..64718.347 rows=60045310 loops=1)
                                                   Buffers: shared hit=618696 read=454160 written=2
                                             ->  Hash  (cost=65522.00..65522.00 rows=100098 width=4) (actual time=4421.535..4421.535 rows=109063 loops=1)
                                                   Buckets: 16384  Batches: 1  Memory Usage: 3835kB
                                                   Buffers: shared hit=2 read=40520
                                                   ->  Seq Scan on part  (cost=0.00..65522.00 rows=100098 width=4) (actual time=0.023..4331.888 rows=109063 loops=1)
                                                         Filter: ((p_name)::text ~~ '%white%'::text)
                                                         Rows Removed by Filter: 1890937
                                                         Buffers: shared hit=2 read=40520
                           ->  Index Scan using pk_supplier on supplier  (cost=0.00..0.28 rows=1 width=8) (actual time=0.034..0.035 rows=1 loops=3272294)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9834465
                     ->  Index Scan using pk_orders on orders  (cost=0.00..1.96 rows=1 width=8) (actual time=0.065..0.065 rows=1 loops=3272294)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=13046656 read=60324 dirtied=12 written=675
               ->  Index Scan using pk_nation on nation  (cost=0.00..0.27 rows=1 width=30) (actual time=0.033..0.033 rows=1 loops=3272294)
                     Index Cond: (n_nationkey = supplier.s_nationkey)
                     Buffers: shared hit=6544588
 Total runtime: 708647.233 ms
(43 rows)

COMMIT;
COMMIT