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 '%turquoise%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                  QUERY PLAN                                                                                   
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=3498615.05..3498619.88 rows=138 width=46) (actual time=258807.196..262266.310 rows=175 loops=1)
   Buffers: shared hit=29925181 read=922519 dirtied=1 written=4702
   ->  Sort  (cost=3498615.05..3498615.39 rows=138 width=46) (actual time=258793.135..259818.563 rows=3251721 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 555578kB
         Buffers: shared hit=29925181 read=922519 dirtied=1 written=4702
         ->  Nested Loop  (cost=2829345.05..3498610.14 rows=138 width=46) (actual time=121051.523..235359.432 rows=3251721 loops=1)
               Buffers: shared hit=29925173 read=922519 dirtied=1 written=4702
               ->  Nested Loop  (cost=2829345.05..3498570.79 rows=138 width=24) (actual time=121051.453..217910.448 rows=3251721 loops=1)
                     Buffers: shared hit=23421731 read=922519 dirtied=1 written=4702
                     ->  Nested Loop  (cost=2829345.05..3498299.67 rows=138 width=24) (actual time=121051.324..153708.035 rows=3251721 loops=1)
                           Buffers: shared hit=10669521 read=650014 written=499
                           ->  Merge Join  (cost=2829345.05..3498259.48 rows=138 width=28) (actual time=121051.287..133864.698 rows=3251721 loops=1)
                                 Merge Cond: ((partsupp.ps_partkey = lineitem.l_partkey) AND (partsupp.ps_suppkey = lineitem.l_suppkey))
                                 Buffers: shared hit=896951 read=649584 written=498
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..603091.33 rows=8000000 width=12) (actual time=0.017..6094.404 rows=7999965 loops=1)
                                       Buffers: shared hit=286975 read=147234 written=498
                                 ->  Sort  (cost=2829344.93..2837952.56 rows=3443052 width=28) (actual time=121051.177..123704.056 rows=3251721 loops=1)
                                       Sort Key: part.p_partkey, lineitem.l_suppkey
                                       Sort Method: quicksort  Memory: 352345kB
                                       Buffers: shared hit=609976 read=502350
                                       ->  Hash Join  (cost=66948.40..2455511.15 rows=3443052 width=28) (actual time=2313.975..115279.095 rows=3251721 loops=1)
                                             Hash Cond: (lineitem.l_partkey = part.p_partkey)
                                             Buffers: shared hit=609973 read=502350
                                             ->  Seq Scan on lineitem  (cost=0.00..1675249.40 rows=60345140 width=24) (actual time=0.034..21967.031 rows=60045826 loops=1)
                                                   Buffers: shared hit=609948 read=461850
                                             ->  Hash  (cost=65522.00..65522.00 rows=114112 width=4) (actual time=2313.569..2313.569 rows=108348 loops=1)
                                                   Buckets: 16384  Batches: 1  Memory Usage: 3810kB
                                                   Buffers: shared hit=22 read=40500
                                                   ->  Seq Scan on part  (cost=0.00..65522.00 rows=114112 width=4) (actual time=0.031..2225.507 rows=108348 loops=1)
                                                         Filter: ((p_name)::text ~~ '%turquoise%'::text)
                                                         Rows Removed by Filter: 1891652
                                                         Buffers: shared hit=22 read=40500
                           ->  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=3251721)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9772570 read=430 written=1
                     ->  Index Only Scan using orders_o_orderkey_o_orderdate_idx on orders  (cost=0.00..1.95 rows=1 width=8) (actual time=0.018..0.019 rows=1 loops=3251721)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Heap Fetches: 3251721
                           Buffers: shared hit=12752210 read=272505 dirtied=1 written=4203
               ->  Index Scan using pk_nation on nation  (cost=0.00..0.27 rows=1 width=30) (actual time=0.003..0.003 rows=1 loops=3251721)
                     Index Cond: (n_nationkey = supplier.s_nationkey)
                     Buffers: shared hit=6503442
 Total runtime: 262406.200 ms
(44 rows)

COMMIT;
COMMIT