BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	s_name,
	count(*) as numwait
from
	supplier,
	lineitem l1,
	orders,
	nation
where
	s_suppkey = l1.l_suppkey
	and o_orderkey = l1.l_orderkey
	and o_orderstatus = 'F'
	and l1.l_receiptdate > l1.l_commitdate
	and exists (
		select
			*
		from
			lineitem l2
		where
			l2.l_orderkey = l1.l_orderkey
			and l2.l_suppkey <> l1.l_suppkey
	)
	and not exists (
		select
			*
		from
			lineitem l3
		where
			l3.l_orderkey = l1.l_orderkey
			and l3.l_suppkey <> l1.l_suppkey
			and l3.l_receiptdate > l3.l_commitdate
	)
	and s_nationkey = n_nationkey
	and n_name = 'IRAN'
group by
	s_name
order by
	numwait desc,
	s_name
LIMIT 100;
                                                                                                 QUERY PLAN                                                                                                 
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=1955740.33..1955740.34 rows=1 width=26) (actual time=36676.775..36676.778 rows=100 loops=1)
   Buffers: shared hit=13683645 read=936214 dirtied=1041 written=1118
   ->  Sort  (cost=1955740.33..1955740.34 rows=1 width=26) (actual time=36676.772..36676.773 rows=100 loops=1)
         Sort Key: (count(*)), supplier.s_name
         Sort Method: top-N heapsort  Memory: 32kB
         Buffers: shared hit=13683645 read=936214 dirtied=1041 written=1118
         ->  HashAggregate  (cost=1955740.31..1955740.32 rows=1 width=26) (actual time=36674.216..36675.700 rows=4023 loops=1)
               Group Key: supplier.s_name
               Buffers: shared hit=13683637 read=936214 dirtied=1041 written=1118
               ->  Nested Loop Anti Join  (cost=2443.74..1955740.31 rows=1 width=26) (actual time=16.720..36613.711 rows=39964 loops=1)
                     Buffers: shared hit=13683637 read=936214 dirtied=1041 written=1118
                     ->  Nested Loop Semi Join  (cost=2443.17..1955739.00 rows=1 width=34) (actual time=13.462..34081.474 rows=709799 loops=1)
                           Join Filter: (orders.o_orderkey = l2.l_orderkey)
                           Buffers: shared hit=10128459 read=934126 dirtied=1041 written=1112
                           ->  Nested Loop  (cost=2442.61..1433005.98 rows=391240 width=38) (actual time=13.440..29745.138 rows=736482 loops=1)
                                 Buffers: shared hit=6565261 read=808976 dirtied=1038 written=991
                                 ->  Hash Join  (cost=2442.17..1011469.56 rows=800775 width=34) (actual time=13.355..22636.521 rows=1524524 loops=1)
                                       Hash Cond: (l1.l_suppkey = supplier.s_suppkey)
                                       Buffers: shared hit=562144 read=705668 dirtied=1038 written=947
                                       ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem l1  (cost=0.56..925888.27 rows=20035183 width=8) (actual time=0.072..16205.661 rows=37966905 loops=1)
                                             Buffers: shared hit=560290 read=705651 dirtied=1038 written=945
                                       ->  Hash  (cost=2391.61..2391.61 rows=4000 width=30) (actual time=13.242..13.242 rows=4023 loops=1)
                                             Buckets: 4096  Batches: 1  Memory Usage: 284kB
                                             Buffers: shared hit=1851 read=17 written=2
                                             ->  Nested Loop  (cost=79.29..2391.61 rows=4000 width=30) (actual time=1.123..12.235 rows=4023 loops=1)
                                                   Buffers: shared hit=1851 read=17 written=2
                                                   ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.008..0.013 rows=1 loops=1)
                                                         Filter: (n_name = 'IRAN'::bpchar)
                                                         Rows Removed by Filter: 24
                                                         Buffers: shared hit=1
                                                   ->  Bitmap Heap Scan on supplier  (cost=79.29..2350.29 rows=4000 width=34) (actual time=1.109..11.522 rows=4023 loops=1)
                                                         Recheck Cond: (s_nationkey = nation.n_nationkey)
                                                         Heap Blocks: exact=1854
                                                         Buffers: shared hit=1850 read=17 written=2
                                                         ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.29 rows=4000 width=0) (actual time=0.847..0.847 rows=4023 loops=1)
                                                               Index Cond: (s_nationkey = nation.n_nationkey)
                                                               Buffers: shared read=13 written=1
                                 ->  Index Scan using orders_o_orderkey_o_orderdate_idx on orders  (cost=0.43..0.52 rows=1 width=4) (actual time=0.004..0.004 rows=0 loops=1524524)
                                       Index Cond: (o_orderkey = l1.l_orderkey)
                                       Filter: (o_orderstatus = 'F'::bpchar)
                                       Rows Removed by Filter: 1
                                       Buffers: shared hit=6003117 read=103308 written=44
                           ->  Index Scan using lineitem_l_orderkey_idx on lineitem l2  (cost=0.56..1.15 rows=15 width=8) (actual time=0.005..0.005 rows=1 loops=736482)
                                 Index Cond: (l_orderkey = l1.l_orderkey)
                                 Filter: (l_suppkey <> l1.l_suppkey)
                                 Rows Removed by Filter: 0
                                 Buffers: shared hit=3563198 read=125150 dirtied=3 written=121
                     ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem l3  (cost=0.56..0.91 rows=5 width=8) (actual time=0.003..0.003 rows=1 loops=709799)
                           Index Cond: (l_orderkey = l1.l_orderkey)
                           Filter: (l_suppkey <> l1.l_suppkey)
                           Rows Removed by Filter: 0
                           Buffers: shared hit=3555178 read=2088 written=6
 Planning time: 8.680 ms
 Execution time: 36677.119 ms
(54 rows)

COMMIT;
COMMIT