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 'lavender%'
			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 = 'IRAN'
order by
	s_name;
                                                                                                  QUERY PLAN                                                                                                   
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=12740760.65..12740763.59 rows=1174 width=51) (actual time=16086.832..16087.027 rows=1791 loops=1)
   Sort Key: supplier.s_name
   Sort Method: quicksort  Memory: 257kB
   Buffers: shared hit=2746820 read=380953 dirtied=653
   ->  Nested Loop  (cost=12736291.35..12740700.79 rows=1174 width=51) (actual time=15901.461..16069.588 rows=1791 loops=1)
         Join Filter: (supplier.s_nationkey = nation.n_nationkey)
         Rows Removed by Join Filter: 43239
         Buffers: shared hit=2746815 read=380953 dirtied=653
         ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.015..0.027 rows=1 loops=1)
               Filter: (n_name = 'IRAN'::bpchar)
               Rows Removed by Filter: 24
               Buffers: shared hit=1
         ->  Hash Semi Join  (cost=12736291.35..12740332.56 rows=29354 width=55) (actual time=15901.424..16061.549 rows=45030 loops=1)
               Hash Cond: (supplier.s_suppkey = partsupp.ps_suppkey)
               Buffers: shared hit=2746814 read=380953 dirtied=653
               ->  Seq Scan on supplier  (cost=0.00..3179.00 rows=100000 width=59) (actual time=0.014..48.694 rows=100000 loops=1)
                     Buffers: shared hit=2179
               ->  Hash  (cost=12735924.43..12735924.43 rows=29354 width=4) (actual time=15901.348..15901.348 rows=45030 loops=1)
                     Buckets: 4096  Batches: 1  Memory Usage: 1584kB
                     Buffers: shared hit=2744635 read=380953 dirtied=653
                     ->  HashAggregate  (cost=12735337.35..12735630.89 rows=29354 width=4) (actual time=15858.672..15884.183 rows=45030 loops=1)
                           Buffers: shared hit=2744635 read=380953 dirtied=653
                           ->  Nested Loop  (cost=0.00..12735263.96 rows=29354 width=4) (actual time=2.573..15727.923 rows=59568 loops=1)
                                 Buffers: shared hit=2744635 read=380953 dirtied=653
                                 ->  Seq Scan on part  (cost=0.00..65522.00 rows=22022 width=4) (actual time=1.341..1362.004 rows=21882 loops=1)
                                       Filter: ((p_name)::text ~~ 'lavender%'::text)
                                       Rows Removed by Filter: 1978118
                                       Buffers: shared hit=305 read=40217
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..575.31 rows=1 width=8) (actual time=0.505..0.653 rows=3 loops=21882)
                                       Index Cond: (ps_partkey = part.p_partkey)
                                       Filter: ((ps_availqty)::double precision > (SubPlan 1))
                                       Rows Removed by Filter: 1
                                       Buffers: shared hit=2744330 read=340736 dirtied=653
                                       SubPlan 1
                                         ->  Aggregate  (cost=140.92..140.94 rows=1 width=4) (actual time=0.150..0.150 rows=1 loops=87528)
                                               Buffers: shared hit=2687558 read=307012 dirtied=653
                                               ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.00..140.92 rows=1 width=4) (actual time=0.093..0.147 rows=1 loops=87528)
                                                     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=2687558 read=307012 dirtied=653
 Total runtime: 16089.018 ms
(42 rows)

COMMIT;
COMMIT