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 '%thistle%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                      QUERY PLAN                                                                                      
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=1162687.93..1162692.48 rows=130 width=46) (actual time=90676.780..93540.290 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=35934538 read=1788771 dirtied=18574 written=22010
   ->  Sort  (cost=1162687.93..1162688.25 rows=130 width=46) (actual time=90666.454..91316.911 rows=3242404 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 554268kB
         Buffers: shared hit=35934538 read=1788771 dirtied=18574 written=22010
         ->  Hash Join  (cost=66876.18..1162683.36 rows=130 width=46) (actual time=895.296..84515.121 rows=3242404 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=35934530 read=1788771 dirtied=18574 written=22010
               ->  Nested Loop  (cost=66874.62..1162679.36 rows=130 width=24) (actual time=895.236..81284.487 rows=3242404 loops=1)
                     Buffers: shared hit=35934526 read=1788771 dirtied=18574 written=22010
                     ->  Nested Loop  (cost=66874.18..1162616.36 rows=130 width=24) (actual time=895.196..50802.334 rows=3242404 loops=1)
                           Buffers: shared hit=23353901 read=1382063 dirtied=18335 written=15306
                           ->  Nested Loop  (cost=66873.89..1162574.41 rows=130 width=28) (actual time=895.187..40263.774 rows=3242404 loops=1)
                                 Buffers: shared hit=13609242 read=1382063 dirtied=18335 written=15306
                                 ->  Hash Join  (cost=66873.32..352112.02 rows=428069 width=16) (actual time=895.028..4992.422 rows=432128 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=76968 read=134512 written=1468
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.006..2283.137 rows=8000000 loops=1)
                                             Buffers: shared hit=61018 read=109940 written=1468
                                       ->  Hash  (cost=65522.00..65522.00 rows=108106 width=4) (actual time=894.482..894.482 rows=108032 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4822kB
                                             Buffers: shared hit=15950 read=24572
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=108106 width=4) (actual time=0.011..854.981 rows=108032 loops=1)
                                                   Filter: ((p_name)::text ~~ '%thistle%'::text)
                                                   Rows Removed by Filter: 1891968
                                                   Buffers: shared hit=15950 read=24572
                                 ->  Index Scan using lineitem_l_partkey_l_quantity_idx on lineitem  (cost=0.56..1.88 rows=1 width=24) (actual time=0.015..0.079 rows=8 loops=432128)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 23
                                       Buffers: shared hit=13532274 read=1247551 dirtied=18335 written=13838
                           ->  Index Scan using pk_supplier on supplier  (cost=0.29..0.31 rows=1 width=8) (actual time=0.002..0.003 rows=1 loops=3242404)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9744659
                     ->  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=3242404)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=12580625 read=406708 dirtied=239 written=6704
               ->  Hash  (cost=1.25..1.25 rows=25 width=30) (actual time=0.019..0.019 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..0.006 rows=25 loops=1)
                           Buffers: shared hit=1
 Planning time: 34.208 ms
 Execution time: 93568.859 ms
(46 rows)

COMMIT;
COMMIT