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 '%blush%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                           QUERY PLAN                                                                                            
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=1195865.91..1195870.46 rows=130 width=46) (actual time=101468.932..104430.743 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=35427422 read=2498503 dirtied=18240 written=24161
   ->  Sort  (cost=1195865.91..1195866.24 rows=130 width=46) (actual time=101458.135..102383.975 rows=3257589 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 556403kB
         Buffers: shared hit=35427422 read=2498503 dirtied=18240 written=24161
         ->  Hash Join  (cost=66876.35..1195861.35 rows=130 width=46) (actual time=1001.247..93202.517 rows=3257589 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=35427414 read=2498503 dirtied=18240 written=24161
               ->  Nested Loop  (cost=66874.79..1195857.35 rows=130 width=24) (actual time=1001.173..90311.656 rows=3257589 loops=1)
                     Buffers: shared hit=35427410 read=2498503 dirtied=18240 written=24161
                     ->  Nested Loop  (cost=66874.36..1195794.34 rows=130 width=24) (actual time=1001.146..48606.974 rows=3257589 loops=1)
                           Buffers: shared hit=23150284 read=1727548 dirtied=18122 written=14752
                           ->  Nested Loop  (cost=66874.07..1195752.40 rows=130 width=28) (actual time=1001.133..37874.212 rows=3257589 loops=1)
                                 Buffers: shared hit=13360059 read=1727537 dirtied=18122 written=14752
                                 ->  Hash Join  (cost=66873.50..352136.21 rows=430471 width=16) (actual time=1000.988..5256.623 rows=434200 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=66621 read=144859 written=866
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.007..2372.260 rows=8000000 loops=1)
                                             Buffers: shared hit=66619 read=104339 written=863
                                       ->  Hash  (cost=65522.00..65522.00 rows=108120 width=4) (actual time=1000.183..1000.183 rows=108550 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4841kB
                                             Buffers: shared hit=2 read=40520 written=3
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=108120 width=4) (actual time=0.011..958.002 rows=108550 loops=1)
                                                   Filter: ((p_name)::text ~~ '%blush%'::text)
                                                   Rows Removed by Filter: 1891450
                                                   Buffers: shared hit=2 read=40520 written=3
                                 ->  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..0.073 rows=8 loops=434200)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 23
                                       Buffers: shared hit=13293438 read=1582678 dirtied=18122 written=13886
                           ->  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=3257589)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9790225 read=11
                     ->  Index Scan using pk_orders on orders  (cost=0.43..0.47 rows=1 width=8) (actual time=0.012..0.012 rows=1 loops=3257589)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=12277126 read=770955 dirtied=118 written=9409
               ->  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: 32.390 ms
 Execution time: 104487.389 ms
(46 rows)

COMMIT;
COMMIT