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=1261177.62..1261182.52 rows=140 width=46) (actual time=119078.433..122276.830 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=35502979 read=2275811 dirtied=7277 written=20773
   ->  Sort  (cost=1261177.62..1261177.97 rows=140 width=46) (actual time=119065.621..120221.689 rows=3246006 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 554774kB
         Buffers: shared hit=35502979 read=2275811 dirtied=7277 written=20773
         ->  Hash Join  (cost=66976.27..1261172.63 rows=140 width=46) (actual time=1053.898..106765.436 rows=3246006 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=35502971 read=2275811 dirtied=7277 written=20773
               ->  Nested Loop  (cost=66974.71..1261168.45 rows=140 width=24) (actual time=1053.837..103359.793 rows=3246006 loops=1)
                     Buffers: shared hit=35502967 read=2275811 dirtied=7277 written=20773
                     ->  Nested Loop  (cost=66974.27..1261100.60 rows=140 width=24) (actual time=1053.752..55194.812 rows=3246006 loops=1)
                           Buffers: shared hit=23169015 read=1607983 dirtied=7028 written=15828
                           ->  Nested Loop  (cost=66973.98..1261055.42 rows=140 width=28) (actual time=1053.732..43028.422 rows=3246006 loops=1)
                                 Buffers: shared hit=13413375 read=1607983 dirtied=7028 written=15828
                                 ->  Hash Join  (cost=66973.41..352575.93 rows=464452 width=16) (actual time=1053.680..6402.951 rows=432796 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=69921 read=141559 written=1159
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.010..2614.072 rows=8000000 loops=1)
                                             Buffers: shared hit=67198 read=103760 written=1159
                                       ->  Hash  (cost=65522.00..65522.00 rows=116113 width=4) (actual time=1052.773..1052.773 rows=108199 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4828kB
                                             Buffers: shared hit=2723 read=37799
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=116113 width=4) (actual time=0.024..1010.218 rows=108199 loops=1)
                                                   Filter: ((p_name)::text ~~ '%chartreuse%'::text)
                                                   Rows Removed by Filter: 1891801
                                                   Buffers: shared hit=2723 read=37799
                                 ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.56..1.95 rows=1 width=24) (actual time=0.017..0.082 rows=8 loops=432796)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 23
                                       Buffers: shared hit=13343454 read=1466424 dirtied=7028 written=14669
                           ->  Index Scan using pk_supplier on supplier  (cost=0.29..0.31 rows=1 width=8) (actual time=0.003..0.003 rows=1 loops=3246006)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9755640
                     ->  Index Only Scan using orders_o_orderkey_o_orderdate_idx on orders  (cost=0.43..0.47 rows=1 width=8) (actual time=0.014..0.014 rows=1 loops=3246006)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Heap Fetches: 3246006
                           Buffers: shared hit=12333952 read=667828 dirtied=249 written=4945
               ->  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=0.006..0.010 rows=25 loops=1)
                           Buffers: shared hit=1
 Planning time: 33.316 ms
 Execution time: 122354.965 ms
(47 rows)

COMMIT;
COMMIT