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 '%pink%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                  QUERY PLAN                                                                                   
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=3385516.21..3385520.66 rows=127 width=46) (actual time=226048.694..229468.891 rows=175 loops=1)
   Buffers: shared hit=30558614 read=475161 dirtied=37 written=985
   ->  Sort  (cost=3385516.21..3385516.53 rows=127 width=46) (actual time=226037.471..227059.979 rows=3272599 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 558514kB
         Buffers: shared hit=30558614 read=475161 dirtied=37 written=985
         ->  Nested Loop  (cost=2718139.15..3385511.77 rows=127 width=46) (actual time=104283.139..202886.155 rows=3272599 loops=1)
               Buffers: shared hit=30558606 read=475161 dirtied=37 written=985
               ->  Nested Loop  (cost=2718139.15..3385475.55 rows=127 width=24) (actual time=104283.038..187157.269 rows=3272599 loops=1)
                     Buffers: shared hit=24013408 read=475161 dirtied=37 written=985
                     ->  Nested Loop  (cost=2718139.15..3385226.88 rows=127 width=24) (actual time=104282.893..132797.802 rows=3272599 loops=1)
                           Buffers: shared hit=10951603 read=428669
                           ->  Merge Join  (cost=2718139.15..3385189.90 rows=127 width=28) (actual time=104282.835..114950.209 rows=3272599 loops=1)
                                 Merge Cond: ((partsupp.ps_partkey = lineitem.l_partkey) AND (partsupp.ps_suppkey = lineitem.l_suppkey))
                                 Buffers: shared hit=1115755 read=428648
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..603091.29 rows=8000000 width=12) (actual time=0.019..4416.696 rows=7999973 loops=1)
                                       Buffers: shared hit=434209
                                 ->  Sort  (cost=2718139.15..2726126.68 rows=3195014 width=28) (actual time=104282.735..106509.281 rows=3272599 loops=1)
                                       Sort Key: part.p_partkey, lineitem.l_suppkey
                                       Sort Method: quicksort  Memory: 353976kB
                                       Buffers: shared hit=681546 read=428648
                                       ->  Hash Join  (cost=66848.29..2372959.57 rows=3195014 width=28) (actual time=1580.730..100596.882 rows=3272599 loops=1)
                                             Hash Cond: (lineitem.l_partkey = part.p_partkey)
                                             Buffers: shared hit=681543 read=428648
                                             ->  Seq Scan on lineitem  (cost=0.00..1671913.57 rows=60224757 width=24) (actual time=0.047..19019.150 rows=60045303 loops=1)
                                                   Buffers: shared hit=674482 read=395184
                                             ->  Hash  (cost=65522.00..65522.00 rows=106103 width=4) (actual time=1580.365..1580.365 rows=108938 loops=1)
                                                   Buckets: 16384  Batches: 1  Memory Usage: 3830kB
                                                   Buffers: shared hit=7058 read=33464
                                                   ->  Seq Scan on part  (cost=0.00..65522.00 rows=106103 width=4) (actual time=0.027..1505.349 rows=108938 loops=1)
                                                         Filter: ((p_name)::text ~~ '%pink%'::text)
                                                         Rows Removed by Filter: 1891062
                                                         Buffers: shared hit=7058 read=33464
                           ->  Index Scan using pk_supplier on supplier  (cost=0.00..0.28 rows=1 width=8) (actual time=0.004..0.004 rows=1 loops=3272599)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9835848 read=21
                     ->  Index Only Scan using orders_o_orderkey_o_orderdate_idx on orders  (cost=0.00..1.95 rows=1 width=8) (actual time=0.015..0.016 rows=1 loops=3272599)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Heap Fetches: 3272599
                           Buffers: shared hit=13061805 read=46492 dirtied=37 written=985
               ->  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=3272599)
                     Index Cond: (n_nationkey = supplier.s_nationkey)
                     Buffers: shared hit=6545198
 Total runtime: 229575.920 ms
(44 rows)

COMMIT;
COMMIT