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 '%beige%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                  QUERY PLAN                                                                                   
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=3528972.13..3528977.20 rows=145 width=46) (actual time=184352.167..187383.757 rows=175 loops=1)
   Buffers: shared hit=30101326 read=802404 written=5
   ->  Sort  (cost=3528972.13..3528972.49 rows=145 width=46) (actual time=184341.487..185199.122 rows=3257398 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 556376kB
         Buffers: shared hit=30101326 read=802404 written=5
         ->  Nested Loop  (cost=2858638.07..3528966.92 rows=145 width=46) (actual time=95786.271..166291.626 rows=3257398 loops=1)
               Buffers: shared hit=30101318 read=802404 written=5
               ->  Nested Loop  (cost=2858638.07..3528925.57 rows=145 width=24) (actual time=95786.177..157525.804 rows=3257398 loops=1)
                     Buffers: shared hit=23586522 read=802404 written=5
                     ->  Nested Loop  (cost=2858638.07..3528638.31 rows=145 width=24) (actual time=95786.120..115676.095 rows=3257398 loops=1)
                           Buffers: shared hit=10691057 read=650705 written=5
                           ->  Merge Join  (cost=2858638.07..3528596.09 rows=145 width=28) (actual time=95786.061..104793.653 rows=3257398 loops=1)
                                 Merge Cond: ((partsupp.ps_partkey = lineitem.l_partkey) AND (partsupp.ps_suppkey = lineitem.l_suppkey))
                                 Buffers: shared hit=902451 read=649405 written=5
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..603091.29 rows=8000000 width=12) (actual time=0.007..4210.112 rows=7999921 loops=1)
                                       Buffers: shared hit=263900 read=170308 written=4
                                 ->  Sort  (cost=2858635.90..2867591.76 rows=3582344 width=28) (actual time=95785.885..97663.729 rows=3257398 loops=1)
                                       Sort Key: part.p_partkey, lineitem.l_suppkey
                                       Sort Method: quicksort  Memory: 352789kB
                                       Buffers: shared hit=638551 read=479097 written=1
                                       ->  Hash Join  (cost=66998.76..2468653.47 rows=3582344 width=28) (actual time=986.330..92103.183 rows=3257398 loops=1)
                                             Hash Cond: (lineitem.l_partkey = part.p_partkey)
                                             Buffers: shared hit=638548 read=479097 written=1
                                             ->  Seq Scan on lineitem  (cost=0.00..1683572.36 rows=60645236 width=24) (actual time=0.026..15222.051 rows=59984826 loops=1)
                                                   Buffers: shared hit=638543 read=438577 written=1
                                             ->  Hash  (cost=65522.00..65522.00 rows=118141 width=4) (actual time=986.143..986.143 rows=108590 loops=1)
                                                   Buckets: 16384  Batches: 1  Memory Usage: 3818kB
                                                   Buffers: shared hit=2 read=40520
                                                   ->  Seq Scan on part  (cost=0.00..65522.00 rows=118141 width=4) (actual time=0.016..943.515 rows=108590 loops=1)
                                                         Filter: ((p_name)::text ~~ '%beige%'::text)
                                                         Rows Removed by Filter: 1891410
                                                         Buffers: shared hit=2 read=40520
                           ->  Index Scan using pk_supplier on supplier  (cost=0.00..0.28 rows=1 width=8) (actual time=0.002..0.003 rows=1 loops=3257398)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9788606 read=1300
                     ->  Index Scan using pk_orders on orders  (cost=0.00..1.97 rows=1 width=8) (actual time=0.012..0.012 rows=1 loops=3257398)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=12895465 read=151699
               ->  Index Scan using pk_nation on nation  (cost=0.00..0.27 rows=1 width=30) (actual time=0.001..0.002 rows=1 loops=3257398)
                     Index Cond: (n_nationkey = supplier.s_nationkey)
                     Buffers: shared hit=6514796
 Total runtime: 187505.564 ms
(43 rows)

COMMIT;
COMMIT