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 '%chartreuse%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                  QUERY PLAN                                                                                   
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=3509766.52..3509771.35 rows=138 width=46) (actual time=257339.518..260794.117 rows=175 loops=1)
   Buffers: shared hit=30120396 read=676672 dirtied=8 written=13717
   ->  Sort  (cost=3509766.52..3509766.86 rows=138 width=46) (actual time=257327.058..258367.953 rows=3245664 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 554726kB
         Buffers: shared hit=30120396 read=676672 dirtied=8 written=13717
         ->  Nested Loop  (cost=2840392.35..3509761.61 rows=138 width=46) (actual time=126436.265..233810.657 rows=3245664 loops=1)
               Buffers: shared hit=30120388 read=676672 dirtied=8 written=13717
               ->  Nested Loop  (cost=2840392.35..3509722.26 rows=138 width=24) (actual time=126436.195..217128.680 rows=3245664 loops=1)
                     Buffers: shared hit=23629060 read=676672 dirtied=8 written=13717
                     ->  Nested Loop  (cost=2840392.35..3509449.32 rows=138 width=24) (actual time=126436.103..158523.759 rows=3245664 loops=1)
                           Buffers: shared hit=10648631 read=656735 written=12650
                           ->  Merge Join  (cost=2840392.35..3509409.13 rows=138 width=28) (actual time=126436.063..139149.639 rows=3245664 loops=1)
                                 Merge Cond: ((partsupp.ps_partkey = lineitem.l_partkey) AND (partsupp.ps_suppkey = lineitem.l_suppkey))
                                 Buffers: shared hit=894044 read=656735 written=12650
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..603091.33 rows=8000000 width=12) (actual time=0.015..6370.276 rows=7999905 loops=1)
                                       Buffers: shared hit=285592 read=148613 written=12650
                                 ->  Sort  (cost=2840392.23..2849033.97 rows=3456699 width=28) (actual time=126435.829..128631.488 rows=3245664 loops=1)
                                       Sort Key: part.p_partkey, lineitem.l_suppkey
                                       Sort Method: quicksort  Memory: 351872kB
                                       Buffers: shared hit=608452 read=508122
                                       ->  Hash Join  (cost=66948.40..2464978.06 rows=3456699 width=28) (actual time=1673.948..121968.676 rows=3245664 loops=1)
                                             Hash Cond: (lineitem.l_partkey = part.p_partkey)
                                             Buffers: shared hit=608449 read=508122
                                             ->  Seq Scan on lineitem  (cost=0.00..1681889.14 rows=60584314 width=24) (actual time=0.034..24207.388 rows=60044176 loops=1)
                                                   Buffers: shared hit=599225 read=476821
                                             ->  Hash  (cost=65522.00..65522.00 rows=114112 width=4) (actual time=1673.640..1673.640 rows=108199 loops=1)
                                                   Buckets: 16384  Batches: 1  Memory Usage: 3804kB
                                                   Buffers: shared hit=9221 read=31301
                                                   ->  Seq Scan on part  (cost=0.00..65522.00 rows=114112 width=4) (actual time=0.040..1605.498 rows=108199 loops=1)
                                                         Filter: ((p_name)::text ~~ '%chartreuse%'::text)
                                                         Rows Removed by Filter: 1891801
                                                         Buffers: shared hit=9221 read=31301
                           ->  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=3245664)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9754587
                     ->  Index Only Scan using orders_o_orderkey_o_orderdate_idx on orders  (cost=0.00..1.97 rows=1 width=8) (actual time=0.017..0.017 rows=1 loops=3245664)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Heap Fetches: 3245664
                           Buffers: shared hit=12980429 read=19937 dirtied=8 written=1067
               ->  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=3245664)
                     Index Cond: (n_nationkey = supplier.s_nationkey)
                     Buffers: shared hit=6491328
 Total runtime: 260906.667 ms
(44 rows)

COMMIT;
COMMIT