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 'gainsboro%'
			and ps_availqty > (
				select
					0.5 * sum(l_quantity)
				from
					lineitem
				where
					l_partkey = ps_partkey
					and l_suppkey = ps_suppkey
					and l_shipdate >= '1995-01-01'
					and l_shipdate < cast(date '1995-01-01' + interval '1 year' as date)
			)
	)
	and s_nationkey = n_nationkey
	and n_name = 'BRAZIL'
order by
	s_name;
                                                                                            QUERY PLAN                                                                                             
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=11735081.74..11735084.68 rows=1175 width=51) (actual time=8808.812..8808.902 rows=1754 loops=1)
   Sort Key: supplier.s_name
   Sort Method: quicksort  Memory: 254kB
   Buffers: shared hit=2735462 read=359861 dirtied=2830 written=16379
   ->  Hash Join  (cost=11734312.70..11735021.82 rows=1175 width=51) (actual time=8784.415..8806.670 rows=1754 loops=1)
         Hash Cond: (partsupp.ps_suppkey = supplier.s_suppkey)
         Buffers: shared hit=2735457 read=359861 dirtied=2830 written=16379
         ->  HashAggregate  (cost=11731871.10..11732164.73 rows=29363 width=4) (actual time=8770.445..8786.439 rows=44444 loops=1)
               Group Key: partsupp.ps_suppkey
               Buffers: shared hit=2733607 read=359849 dirtied=2830 written=16379
               ->  Nested Loop  (cost=0.86..11731797.69 rows=29363 width=4) (actual time=0.728..8710.989 rows=58641 loops=1)
                     Buffers: shared hit=2733607 read=359849 dirtied=2830 written=16379
                     ->  Index Scan using pk_part on part  (cost=0.43..97473.43 rows=22022 width=4) (actual time=0.068..1095.970 rows=21606 loops=1)
                           Filter: ((p_name)::text ~~ 'gainsboro%'::text)
                           Rows Removed by Filter: 1978394
                           Buffers: shared hit=784 read=45957 written=2031
                     ->  Index Scan using pk_partsupp on partsupp  (cost=0.43..528.29 rows=1 width=8) (actual time=0.288..0.351 rows=3 loops=21606)
                           Index Cond: (ps_partkey = part.p_partkey)
                           Filter: ((ps_availqty)::double precision > (SubPlan 1))
                           Rows Removed by Filter: 1
                           Buffers: shared hit=2732823 read=313892 dirtied=2830 written=14348
                           SubPlan 1
                             ->  Aggregate  (cost=129.34..129.35 rows=1 width=4) (actual time=0.081..0.081 rows=1 loops=86424)
                                   Buffers: shared hit=2665024 read=292408 dirtied=2830 written=13578
                                   ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.56..129.34 rows=1 width=4) (actual time=0.051..0.080 rows=1 loops=86424)
                                         Index Cond: (l_partkey = partsupp.ps_partkey)
                                         Filter: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate < '1996-01-01'::date) AND (l_suppkey = partsupp.ps_suppkey))
                                         Rows Removed by Filter: 29
                                         Buffers: shared hit=2665024 read=292408 dirtied=2830 written=13578
         ->  Hash  (cost=2391.61..2391.61 rows=4000 width=55) (actual time=13.935..13.935 rows=3995 loops=1)
               Buckets: 4096  Batches: 1  Memory Usage: 383kB
               Buffers: shared hit=1850 read=12
               ->  Nested Loop  (cost=79.29..2391.61 rows=4000 width=55) (actual time=1.143..12.434 rows=3995 loops=1)
                     Buffers: shared hit=1850 read=12
                     ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.011..0.023 rows=1 loops=1)
                           Filter: (n_name = 'BRAZIL'::bpchar)
                           Rows Removed by Filter: 24
                           Buffers: shared hit=1
                     ->  Bitmap Heap Scan on supplier  (cost=79.29..2350.29 rows=4000 width=59) (actual time=1.125..11.562 rows=3995 loops=1)
                           Recheck Cond: (s_nationkey = nation.n_nationkey)
                           Heap Blocks: exact=1848
                           Buffers: shared hit=1849 read=12
                           ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.29 rows=4000 width=0) (actual time=0.833..0.833 rows=3995 loops=1)
                                 Index Cond: (s_nationkey = nation.n_nationkey)
                                 Buffers: shared hit=1 read=12
 Planning time: 4.364 ms
 Execution time: 8809.889 ms
(47 rows)

COMMIT;
COMMIT