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 '%blanched%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                  QUERY PLAN                                                                                   
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=3514446.74..3514451.81 rows=145 width=46) (actual time=258003.066..261294.928 rows=175 loops=1)
   Buffers: shared hit=30435811 read=519357 dirtied=8 written=1707
   ->  Sort  (cost=3514446.74..3514447.10 rows=145 width=46) (actual time=257987.466..258963.820 rows=3264071 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 557314kB
         Buffers: shared hit=30435811 read=519357 dirtied=8 written=1707
         ->  Nested Loop  (cost=2843881.79..3514441.53 rows=145 width=46) (actual time=120096.106..237232.805 rows=3264071 loops=1)
               Buffers: shared hit=30435803 read=519357 dirtied=8 written=1707
               ->  Nested Loop  (cost=2843881.79..3514400.18 rows=145 width=24) (actual time=120096.036..218753.141 rows=3264071 loops=1)
                     Buffers: shared hit=23907661 read=519357 dirtied=8 written=1707
                     ->  Nested Loop  (cost=2843881.79..3514116.74 rows=145 width=24) (actual time=120095.930..154753.750 rows=3264071 loops=1)
                           Buffers: shared hit=10932910 read=419974 written=923
                           ->  Merge Join  (cost=2843881.79..3514074.51 rows=145 width=28) (actual time=120095.898..133431.678 rows=3264071 loops=1)
                                 Merge Cond: ((partsupp.ps_partkey = lineitem.l_partkey) AND (partsupp.ps_suppkey = lineitem.l_suppkey))
                                 Buffers: shared hit=1123370 read=419974 written=923
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..603091.33 rows=8000000 width=12) (actual time=0.009..6157.109 rows=7999953 loops=1)
                                       Buffers: shared hit=323520 read=110688 written=923
                                 ->  Sort  (cost=2843881.67..2852915.37 rows=3613482 width=28) (actual time=120095.781..122901.596 rows=3264071 loops=1)
                                       Sort Key: part.p_partkey, lineitem.l_suppkey
                                       Sort Method: quicksort  Memory: 353310kB
                                       Buffers: shared hit=799850 read=309286
                                       ->  Hash Join  (cost=67023.48..2450283.89 rows=3613482 width=28) (actual time=1803.003..115339.551 rows=3264071 loops=1)
                                             Hash Cond: (lineitem.l_partkey = part.p_partkey)
                                             Buffers: shared hit=799847 read=309286
                                             ->  Seq Scan on lineitem  (cost=0.00..1670263.34 rows=60165534 width=24) (actual time=0.037..22624.358 rows=60045379 loops=1)
                                                   Buffers: shared hit=788035 read=280573
                                             ->  Hash  (cost=65522.00..65522.00 rows=120118 width=4) (actual time=1802.628..1802.628 rows=108755 loops=1)
                                                   Buckets: 16384  Batches: 1  Memory Usage: 3824kB
                                                   Buffers: shared hit=11809 read=28713
                                                   ->  Seq Scan on part  (cost=0.00..65522.00 rows=120118 width=4) (actual time=0.017..1549.786 rows=108755 loops=1)
                                                         Filter: ((p_name)::text ~~ '%blanched%'::text)
                                                         Rows Removed by Filter: 1891245
                                                         Buffers: shared hit=11809 read=28713
                           ->  Index Scan using pk_supplier on supplier  (cost=0.00..0.28 rows=1 width=8) (actual time=0.005..0.005 rows=1 loops=3264071)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9809540
                     ->  Index Only Scan using orders_o_orderkey_o_orderdate_idx on orders  (cost=0.00..1.94 rows=1 width=8) (actual time=0.018..0.019 rows=1 loops=3264071)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Heap Fetches: 3264071
                           Buffers: shared hit=12974751 read=99383 dirtied=8 written=784
               ->  Index Scan using pk_nation on nation  (cost=0.00..0.27 rows=1 width=30) (actual time=0.003..0.004 rows=1 loops=3264071)
                     Index Cond: (n_nationkey = supplier.s_nationkey)
                     Buffers: shared hit=6528142
 Total runtime: 261429.652 ms
(44 rows)

COMMIT;
COMMIT