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 '%rosy%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                           QUERY PLAN                                                                                            
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=1148143.73..1148148.03 rows=123 width=46) (actual time=106602.754..110278.384 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=35597149 read=2401071 dirtied=15377 written=21113
   ->  Sort  (cost=1148143.73..1148144.04 rows=123 width=46) (actual time=106590.995..107893.856 rows=3264137 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 557324kB
         Buffers: shared hit=35597149 read=2401071 dirtied=15377 written=21113
         ->  Hash Join  (cost=66801.12..1148139.46 rows=123 width=46) (actual time=819.447..97715.958 rows=3264137 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=35597141 read=2401071 dirtied=15377 written=21113
               ->  Nested Loop  (cost=66799.55..1148135.59 rows=123 width=24) (actual time=819.380..94865.790 rows=3264137 loops=1)
                     Buffers: shared hit=35597137 read=2401071 dirtied=15377 written=21113
                     ->  Nested Loop  (cost=66799.12..1148075.98 rows=123 width=24) (actual time=819.349..50592.262 rows=3264137 loops=1)
                           Buffers: shared hit=23258711 read=1665122 dirtied=15173 written=12107
                           ->  Nested Loop  (cost=66798.83..1148036.29 rows=123 width=28) (actual time=819.333..39223.681 rows=3264137 loops=1)
                                 Buffers: shared hit=13448424 read=1665122 dirtied=15173 written=12107
                                 ->  Hash Join  (cost=66798.26..351821.32 rows=406506 width=16) (actual time=819.214..5541.336 rows=435072 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=113726 read=97754 written=761
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.004..2317.668 rows=8000000 loops=1)
                                             Buffers: shared hit=73204 read=97754 written=761
                                       ->  Hash  (cost=65522.00..65522.00 rows=102101 width=4) (actual time=818.616..818.616 rows=108768 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4848kB
                                             Buffers: shared hit=40522
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=102101 width=4) (actual time=0.020..782.194 rows=108768 loops=1)
                                                   Filter: ((p_name)::text ~~ '%rosy%'::text)
                                                   Rows Removed by Filter: 1891232
                                                   Buffers: shared hit=40522
                                 ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.56..1.95 rows=1 width=24) (actual time=0.015..0.075 rows=8 loops=435072)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 23
                                       Buffers: shared hit=13334698 read=1567368 dirtied=15173 written=11346
                           ->  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=3264137)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9810287
                     ->  Index Scan using pk_orders on orders  (cost=0.43..0.47 rows=1 width=8) (actual time=0.013..0.013 rows=1 loops=3264137)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=12338426 read=735949 dirtied=204 written=9006
               ->  Hash  (cost=1.25..1.25 rows=25 width=30) (actual time=0.020..0.020 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=0.004..0.009 rows=25 loops=1)
                           Buffers: shared hit=1
 Planning time: 32.232 ms
 Execution time: 110338.464 ms
(46 rows)

COMMIT;
COMMIT