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 'royal%'
			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 = 'KENYA'
order by
	s_name;
                                                                                                  QUERY PLAN                                                                                                   
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=12740756.53..12740759.47 rows=1175 width=51) (actual time=18570.071..18570.156 rows=1820 loops=1)
   Sort Key: supplier.s_name
   Sort Method: quicksort  Memory: 261kB
   Buffers: shared hit=2682648 read=429063 dirtied=5867 written=540
   ->  Nested Loop  (cost=12736286.90..12740696.61 rows=1175 width=51) (actual time=18473.674..18558.706 rows=1820 loops=1)
         Join Filter: (supplier.s_nationkey = nation.n_nationkey)
         Rows Removed by Join Filter: 42739
         Buffers: shared hit=2682643 read=429063 dirtied=5867 written=540
         ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.072..0.084 rows=1 loops=1)
               Filter: (n_name = 'KENYA'::bpchar)
               Rows Removed by Filter: 24
               Buffers: shared hit=1
         ->  Hash Semi Join  (cost=12736286.90..12740328.26 rows=29363 width=55) (actual time=18473.519..18553.838 rows=44559 loops=1)
               Hash Cond: (supplier.s_suppkey = partsupp.ps_suppkey)
               Buffers: shared hit=2682642 read=429063 dirtied=5867 written=540
               ->  Seq Scan on supplier  (cost=0.00..3179.00 rows=100000 width=59) (actual time=0.035..32.559 rows=100000 loops=1)
                     Buffers: shared hit=2179
               ->  Hash  (cost=12735919.86..12735919.86 rows=29363 width=4) (actual time=18473.397..18473.397 rows=44559 loops=1)
                     Buckets: 4096  Batches: 1  Memory Usage: 1567kB
                     Buffers: shared hit=2680463 read=429063 dirtied=5867 written=540
                     ->  HashAggregate  (cost=12735332.60..12735626.23 rows=29363 width=4) (actual time=18440.133..18459.731 rows=44559 loops=1)
                           Buffers: shared hit=2680463 read=429063 dirtied=5867 written=540
                           ->  Nested Loop  (cost=0.00..12735259.19 rows=29363 width=4) (actual time=0.869..18306.559 rows=58983 loops=1)
                                 Buffers: shared hit=2680463 read=429063 dirtied=5867 written=540
                                 ->  Seq Scan on part  (cost=0.00..65522.00 rows=22022 width=4) (actual time=0.033..1398.960 rows=21695 loops=1)
                                       Filter: ((p_name)::text ~~ 'royal%'::text)
                                       Rows Removed by Filter: 1978305
                                       Buffers: shared hit=5400 read=35122 written=49
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..575.31 rows=1 width=8) (actual time=0.601..0.776 rows=3 loops=21695)
                                       Index Cond: (ps_partkey = part.p_partkey)
                                       Filter: ((ps_availqty)::double precision > (SubPlan 1))
                                       Rows Removed by Filter: 1
                                       Buffers: shared hit=2675063 read=393941 dirtied=5867 written=491
                                       SubPlan 1
                                         ->  Aggregate  (cost=140.92..140.94 rows=1 width=4) (actual time=0.182..0.182 rows=1 loops=86780)
                                               Buffers: shared hit=2605188 read=374277 dirtied=5867 written=472
                                               ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.00..140.92 rows=1 width=4) (actual time=0.113..0.179 rows=1 loops=86780)
                                                     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=2605188 read=374277 dirtied=5867 written=472
 Total runtime: 18571.806 ms
(42 rows)

COMMIT;
COMMIT