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 '%yellow%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                      QUERY PLAN                                                                                      
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=1054896.43..1054900.35 rows=112 width=46) (actual time=88357.511..91140.599 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=36057686 read=1913415 dirtied=464 written=7429
   ->  Sort  (cost=1054896.43..1054896.71 rows=112 width=46) (actual time=88347.002..88924.410 rows=3267799 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 557839kB
         Buffers: shared hit=36057686 read=1913415 dirtied=464 written=7429
         ->  Hash Join  (cost=66701.00..1054892.62 rows=112 width=46) (actual time=594.911..82352.955 rows=3267799 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=36057678 read=1913415 dirtied=464 written=7429
               ->  Nested Loop  (cost=66699.44..1054888.96 rows=112 width=24) (actual time=594.852..79174.429 rows=3267799 loops=1)
                     Buffers: shared hit=36057674 read=1913415 dirtied=464 written=7429
                     ->  Nested Loop  (cost=66699.01..1054834.68 rows=112 width=24) (actual time=594.779..49353.070 rows=3267799 loops=1)
                           Buffers: shared hit=23460926 read=1420981 written=6305
                           ->  Nested Loop  (cost=66698.71..1054798.54 rows=112 width=28) (actual time=594.770..39145.341 rows=3267799 loops=1)
                                 Buffers: shared hit=13640079 read=1420981 written=6305
                                 ->  Hash Join  (cost=66698.15..351381.92 rows=372577 width=16) (actual time=594.599..4770.014 rows=435240 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=78448 read=133032 written=85
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.005..2467.971 rows=8000000 loops=1)
                                             Buffers: shared hit=37926 read=133032 written=85
                                       ->  Hash  (cost=65522.00..65522.00 rows=94092 width=4) (actual time=594.087..594.087 rows=108810 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4850kB
                                             Buffers: shared hit=40522
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=94092 width=4) (actual time=0.010..564.078 rows=108810 loops=1)
                                                   Filter: ((p_name)::text ~~ '%yellow%'::text)
                                                   Rows Removed by Filter: 1891190
                                                   Buffers: shared hit=40522
                                 ->  Index Scan using lineitem_l_partkey_l_quantity_idx on lineitem  (cost=0.56..1.88 rows=1 width=24) (actual time=0.015..0.077 rows=8 loops=435240)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 23
                                       Buffers: shared hit=13561631 read=1287949 written=6220
                           ->  Index Scan using pk_supplier on supplier  (cost=0.29..0.31 rows=1 width=8) (actual time=0.002..0.002 rows=1 loops=3267799)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9820847
                     ->  Index Scan using pk_orders on orders  (cost=0.43..0.47 rows=1 width=8) (actual time=0.008..0.009 rows=1 loops=3267799)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=12596748 read=492434 dirtied=464 written=1124
               ->  Hash  (cost=1.25..1.25 rows=25 width=30) (actual time=0.022..0.022 rows=25 loops=1)
                     Buckets: 1024  Batches: 1  Memory Usage: 10kB
                     Buffers: shared hit=1
                     ->  Seq Scan on nation  (cost=0.00..1.25 rows=25 width=30) (actual time=0.005..0.009 rows=25 loops=1)
                           Buffers: shared hit=1
 Planning time: 32.379 ms
 Execution time: 91155.917 ms
(46 rows)

COMMIT;
COMMIT