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 '%rosy%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                           QUERY PLAN                                                                                            
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=1009930.11..1009933.68 rows=102 width=46) (actual time=123339.269..126572.587 rows=175 loops=1)
   Group Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
   Buffers: shared hit=35603174 read=2396319 dirtied=14888 written=18493
   ->  Sort  (cost=1009930.11..1009930.37 rows=102 width=46) (actual time=123327.174..124352.918 rows=3264054 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 557312kB
         Buffers: shared hit=35603174 read=2396319 dirtied=14888 written=18493
         ->  Hash Join  (cost=66575.89..1009926.71 rows=102 width=46) (actual time=1168.290..108306.843 rows=3264054 loops=1)
               Hash Cond: (supplier.s_nationkey = nation.n_nationkey)
               Buffers: shared hit=35603166 read=2396319 dirtied=14888 written=18493
               ->  Nested Loop  (cost=66574.33..1009923.24 rows=102 width=24) (actual time=1168.226..105176.073 rows=3264054 loops=1)
                     Buffers: shared hit=35603162 read=2396319 dirtied=14888 written=18493
                     ->  Nested Loop  (cost=66573.90..1009873.80 rows=102 width=24) (actual time=1168.106..55308.361 rows=3264054 loops=1)
                           Buffers: shared hit=23309938 read=1615547 dirtied=14429 written=11249
                           ->  Nested Loop  (cost=66573.60..1009840.89 rows=102 width=28) (actual time=1168.095..43093.313 rows=3264054 loops=1)
                                 Buffers: shared hit=13499900 read=1615547 dirtied=14429 written=11249
                                 ->  Hash Join  (cost=66573.04..350894.36 rows=336332 width=16) (actual time=1167.997..6154.683 rows=435072 loops=1)
                                       Hash Cond: (partsupp.ps_partkey = part.p_partkey)
                                       Buffers: shared hit=58567 read=152913 written=948
                                       ->  Seq Scan on partsupp  (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.004..2667.857 rows=8000000 loops=1)
                                             Buffers: shared hit=55345 read=115613 written=676
                                       ->  Hash  (cost=65522.00..65522.00 rows=84083 width=4) (actual time=1167.095..1167.095 rows=108768 loops=1)
                                             Buckets: 131072  Batches: 1  Memory Usage: 4848kB
                                             Buffers: shared hit=3222 read=37300 written=272
                                             ->  Seq Scan on part  (cost=0.00..65522.00 rows=84083 width=4) (actual time=0.014..1122.276 rows=108768 loops=1)
                                                   Filter: ((p_name)::text ~~ '%rosy%'::text)
                                                   Rows Removed by Filter: 1891232
                                                   Buffers: shared hit=3222 read=37300 written=272
                                 ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.56..1.95 rows=1 width=24) (actual time=0.016..0.082 rows=8 loops=435072)
                                       Index Cond: (l_partkey = partsupp.ps_partkey)
                                       Filter: (partsupp.ps_suppkey = l_suppkey)
                                       Rows Removed by Filter: 23
                                       Buffers: shared hit=13441333 read=1462634 dirtied=14429 written=10301
                           ->  Index Scan using pk_supplier on supplier  (cost=0.29..0.31 rows=1 width=8) (actual time=0.003..0.003 rows=1 loops=3264054)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9810038
                     ->  Index Only Scan using orders_o_orderkey_o_orderdate_idx on orders  (cost=0.43..0.47 rows=1 width=8) (actual time=0.014..0.015 rows=1 loops=3264054)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Heap Fetches: 3264054
                           Buffers: shared hit=12293224 read=780772 dirtied=459 written=7244
               ->  Hash  (cost=1.25..1.25 rows=25 width=30) (actual time=0.022..0.022 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=0.007..0.009 rows=25 loops=1)
                           Buffers: shared hit=1
 Planning time: 33.417 ms
 Execution time: 126652.334 ms
(47 rows)

COMMIT;
COMMIT