BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	s_name,
	s_address
from
	supplier,
	nation
where
	s_suppkey in (
		select
			distinct (ps_suppkey)
		from
			partsupp,
			part
		where
			ps_partkey=p_partkey
			and p_name like 'forest%'
			and ps_availqty > (
				select
					0.5 * sum(l_quantity)
				from
					lineitem
				where
					l_partkey = ps_partkey
					and l_suppkey = ps_suppkey
					and l_shipdate >= '1996-01-01'
					and l_shipdate < cast(date '1996-01-01' + interval '1 year' as date)
			)
	)
	and s_nationkey = n_nationkey
	and n_name = 'CANADA'
order by
	s_name;
                                                                                               QUERY PLAN                                                                                                
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=11590321.29..11590323.95 rows=1063 width=51) (actual time=14883.753..14883.923 rows=1830 loops=1)
   Sort Key: supplier.s_name
   Sort Method: quicksort  Memory: 261kB
   Buffers: shared hit=2715389 read=369134 dirtied=4400 written=72
   ->  Hash Semi Join  (cost=11587924.74..11590267.86 rows=1063 width=51) (actual time=14824.084..14851.507 rows=1830 loops=1)
         Hash Cond: (supplier.s_suppkey = partsupp.ps_suppkey)
         Buffers: shared hit=2715384 read=369134 dirtied=4400 written=72
         ->  Nested Loop  (cost=79.26..2391.58 rows=4000 width=55) (actual time=1.737..17.805 rows=4054 loops=1)
               Buffers: shared hit=1856 read=12
               ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.015..0.024 rows=1 loops=1)
                     Filter: (n_name = 'CANADA'::bpchar)
                     Rows Removed by Filter: 24
                     Buffers: shared hit=1
               ->  Bitmap Heap Scan on supplier  (cost=79.26..2350.26 rows=4000 width=59) (actual time=1.715..16.325 rows=4054 loops=1)
                     Recheck Cond: (s_nationkey = nation.n_nationkey)
                     Buffers: shared hit=1855 read=12
                     ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.26 rows=4000 width=0) (actual time=1.332..1.332 rows=4054 loops=1)
                           Index Cond: (s_nationkey = nation.n_nationkey)
                           Buffers: shared hit=2 read=12
         ->  Hash  (cost=11587513.26..11587513.26 rows=26577 width=4) (actual time=14822.265..14822.265 rows=44389 loops=1)
               Buckets: 4096  Batches: 1  Memory Usage: 1561kB
               Buffers: shared hit=2713528 read=369122 dirtied=4400 written=72
               ->  HashAggregate  (cost=11586981.72..11587247.49 rows=26577 width=4) (actual time=14775.725..14805.192 rows=44389 loops=1)
                     Buffers: shared hit=2713528 read=369122 dirtied=4400 written=72
                     ->  Nested Loop  (cost=0.00..11586915.28 rows=26577 width=4) (actual time=0.958..14658.902 rows=58485 loops=1)
                           Buffers: shared hit=2713528 read=369122 dirtied=4400 written=72
                           ->  Seq Scan on part  (cost=0.00..65522.00 rows=20019 width=4) (actual time=0.013..1329.727 rows=21551 loops=1)
                                 Filter: ((p_name)::text ~~ 'forest%'::text)
                                 Rows Removed by Filter: 1978449
                                 Buffers: shared hit=1 read=40521 written=9
                           ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..575.51 rows=1 width=8) (actual time=0.477..0.615 rows=3 loops=21551)
                                 Index Cond: (ps_partkey = part.p_partkey)
                                 Filter: ((ps_availqty)::double precision > (SubPlan 1))
                                 Rows Removed by Filter: 1
                                 Buffers: shared hit=2713527 read=328601 dirtied=4400 written=63
                                 SubPlan 1
                                   ->  Aggregate  (cost=140.92..140.94 rows=1 width=4) (actual time=0.142..0.143 rows=1 loops=86204)
                                         Buffers: shared hit=2648682 read=304374 dirtied=4400 written=55
                                         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.00..140.92 rows=1 width=4) (actual time=0.089..0.140 rows=1 loops=86204)
                                               Index Cond: (l_partkey = partsupp.ps_partkey)
                                               Filter: ((l_shipdate >= '1996-01-01'::date) AND (l_shipdate < '1997-01-01'::date) AND (l_suppkey = partsupp.ps_suppkey))
                                               Rows Removed by Filter: 29
                                               Buffers: shared hit=2648682 read=304374 dirtied=4400 written=55
 Total runtime: 14885.537 ms
(44 rows)

COMMIT;
COMMIT