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 '%powder%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                   QUERY PLAN                                                                                   
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=3248868.96..3248872.78 rows=109 width=46) (actual time=662149.311..665455.660 rows=175 loops=1)
   Buffers: shared hit=30299410 read=557919 dirtied=23 written=2563
   ->  Sort  (cost=3248868.96..3248869.23 rows=109 width=46) (actual time=662135.974..663028.149 rows=3252894 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 555743kB
         Buffers: shared hit=30299410 read=557919 dirtied=23 written=2563
         ->  Nested Loop  (cost=2585127.08..3248865.27 rows=109 width=46) (actual time=183378.176..640452.110 rows=3252894 loops=1)
               Buffers: shared hit=30299402 read=557919 dirtied=23 written=2563
               ->  Nested Loop  (cost=2585127.08..3248834.18 rows=109 width=24) (actual time=183378.078..529154.301 rows=3252894 loops=1)
                     Buffers: shared hit=23793614 read=557919 dirtied=23 written=2563
                     ->  Nested Loop  (cost=2585127.08..3248620.40 rows=109 width=24) (actual time=183377.559..321042.442 rows=3252894 loops=1)
                           Buffers: shared hit=10851507 read=470482 written=1552
                           ->  Merge Join  (cost=2585127.08..3248588.66 rows=109 width=28) (actual time=183377.494..208892.256 rows=3252894 loops=1)
                                 Merge Cond: ((partsupp.ps_partkey = lineitem.l_partkey) AND (partsupp.ps_suppkey = lineitem.l_suppkey))
                                 Buffers: shared hit=1074995 read=470482 written=1552
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..603091.29 rows=8000000 width=12) (actual time=0.009..16706.933 rows=8000000 loops=1)
                                       Buffers: shared hit=309741 read=124468 written=1548
                                 ->  Sort  (cost=2585127.06..2591916.81 rows=2715902 width=28) (actual time=183377.398..186786.193 rows=3252894 loops=1)
                                       Sort Key: part.p_partkey, lineitem.l_suppkey
                                       Sort Method: quicksort  Memory: 352437kB
                                       Buffers: shared hit=765254 read=346014 written=4
                                       ->  Hash Join  (cost=66648.27..2294892.19 rows=2715902 width=28) (actual time=3620.419..176488.689 rows=3252894 loops=1)
                                             Hash Cond: (lineitem.l_partkey = part.p_partkey)
                                             Buffers: shared hit=765251 read=346014 written=4
                                             ->  Seq Scan on lineitem  (cost=0.00..1673590.61 rows=60285061 width=24) (actual time=0.029..55328.755 rows=59986308 loops=1)
                                                   Buffers: shared hit=761386 read=309354 written=4
                                             ->  Hash  (cost=65522.00..65522.00 rows=90102 width=4) (actual time=3620.080..3620.080 rows=108553 loops=1)
                                                   Buckets: 16384  Batches: 1  Memory Usage: 3817kB
                                                   Buffers: shared hit=3862 read=36660
                                                   ->  Seq Scan on part  (cost=0.00..65522.00 rows=90102 width=4) (actual time=0.019..3528.545 rows=108553 loops=1)
                                                         Filter: ((p_name)::text ~~ '%powder%'::text)
                                                         Rows Removed by Filter: 1891447
                                                         Buffers: shared hit=3862 read=36660
                           ->  Index Scan using pk_supplier on supplier  (cost=0.00..0.28 rows=1 width=8) (actual time=0.032..0.033 rows=1 loops=3252894)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9776512
                     ->  Index Scan using pk_orders on orders  (cost=0.00..1.95 rows=1 width=8) (actual time=0.062..0.062 rows=1 loops=3252894)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=12942107 read=87437 dirtied=23 written=1011
               ->  Index Scan using pk_nation on nation  (cost=0.00..0.27 rows=1 width=30) (actual time=0.031..0.031 rows=1 loops=3252894)
                     Index Cond: (n_nationkey = supplier.s_nationkey)
                     Buffers: shared hit=6505788
 Total runtime: 665567.726 ms
(43 rows)

COMMIT;
COMMIT