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 = 'IRAQ'
group by
	s_name
order by
	numwait desc,
	s_name
LIMIT 100;
                                                                                                  QUERY PLAN                                                                                                  
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2846169.14..2846169.14 rows=1 width=26) (actual time=39843.522..39843.538 rows=100 loops=1)
   Buffers: shared hit=14161369 read=546079 dirtied=1321 written=3301
   ->  Sort  (cost=2846169.14..2846169.14 rows=1 width=26) (actual time=39843.520..39843.526 rows=100 loops=1)
         Sort Key: (count(*)), supplier.s_name
         Sort Method: top-N heapsort  Memory: 32kB
         Buffers: shared hit=14161369 read=546079 dirtied=1321 written=3301
         ->  HashAggregate  (cost=2846169.12..2846169.13 rows=1 width=26) (actual time=39841.319..39842.411 rows=4095 loops=1)
               Group Key: supplier.s_name
               Buffers: shared hit=14161361 read=546079 dirtied=1321 written=3301
               ->  Nested Loop Anti Join  (cost=2406.88..2846169.11 rows=1 width=26) (actual time=32.352..39789.548 rows=40955 loops=1)
                     Buffers: shared hit=14161361 read=546079 dirtied=1321 written=3301
                     ->  Nested Loop Semi Join  (cost=2406.31..2846167.33 rows=1 width=34) (actual time=32.284..36931.498 rows=724776 loops=1)
                           Join Filter: (orders.o_orderkey = l2.l_orderkey)
                           Buffers: shared hit=10523618 read=544455 dirtied=1318 written=3289
                           ->  Nested Loop  (cost=2405.75..2325586.21 rows=389630 width=38) (actual time=32.243..32540.225 rows=752178 loops=1)
                                 Buffers: shared hit=6817913 read=483565 dirtied=1316 written=1560
                                 ->  Hash Join  (cost=2405.31..1904405.39 rows=800100 width=34) (actual time=32.199..24851.407 rows=1555822 loops=1)
                                       Hash Cond: (l1.l_suppkey = supplier.s_suppkey)
                                       Buffers: shared hit=643032 read=426696 dirtied=1064 written=1045
                                       ->  Seq Scan on lineitem l1  (cost=0.00..1818866.70 rows=20035299 width=8) (actual time=0.013..18346.140 rows=37966905 loops=1)
                                             Filter: (l_receiptdate > l_commitdate)
                                             Rows Removed by Filter: 22078698
                                             Buffers: shared hit=640848 read=426695 dirtied=1064 written=1045
                                       ->  Hash  (cost=2355.31..2355.31 rows=4000 width=30) (actual time=32.147..32.147 rows=4095 loops=1)
                                             Buckets: 4096  Batches: 1  Memory Usage: 288kB
                                             Buffers: shared hit=2181 read=1
                                             ->  Nested Loop  (cost=43.00..2355.31 rows=4000 width=30) (actual time=0.304..30.957 rows=4095 loops=1)
                                                   Buffers: shared hit=2181 read=1
                                                   ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.006..0.010 rows=1 loops=1)
                                                         Filter: (n_name = 'IRAQ'::bpchar)
                                                         Rows Removed by Filter: 24
                                                         Buffers: shared hit=1
                                                   ->  Bitmap Heap Scan on supplier  (cost=43.00..2314.00 rows=4000 width=34) (actual time=0.290..30.289 rows=4095 loops=1)
                                                         Recheck Cond: (s_nationkey = nation.n_nationkey)
                                                         Rows Removed by Index Recheck: 95905
                                                         Heap Blocks: lossy=2179
                                                         Buffers: shared hit=2180 read=1
                                                         ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_brin_idx  (cost=0.00..42.00 rows=4000 width=0) (actual time=0.269..0.269 rows=23040 loops=1)
                                                               Index Cond: (s_nationkey = nation.n_nationkey)
                                                               Buffers: shared hit=1 read=1
                                 ->  Index Scan using pk_orders on orders  (cost=0.43..0.52 rows=1 width=4) (actual time=0.004..0.004 rows=0 loops=1555822)
                                       Index Cond: (o_orderkey = l1.l_orderkey)
                                       Filter: (o_orderstatus = 'F'::bpchar)
                                       Rows Removed by Filter: 1
                                       Buffers: shared hit=6174881 read=56869 dirtied=252 written=515
                           ->  Index Scan using pk_lineitem on lineitem l2  (cost=0.56..1.15 rows=15 width=8) (actual time=0.005..0.005 rows=1 loops=752178)
                                 Index Cond: (l_orderkey = l1.l_orderkey)
                                 Filter: (l_suppkey <> l1.l_suppkey)
                                 Rows Removed by Filter: 0
                                 Buffers: shared hit=3705705 read=60890 dirtied=2 written=1729
                     ->  Index Scan using pk_lineitem on lineitem l3  (cost=0.56..1.15 rows=5 width=8) (actual time=0.003..0.003 rows=1 loops=724776)
                           Index Cond: (l_orderkey = l1.l_orderkey)
                           Filter: ((l_receiptdate > l_commitdate) AND (l_suppkey <> l1.l_suppkey))
                           Rows Removed by Filter: 1
                           Buffers: shared hit=3637743 read=1624 dirtied=3 written=12
 Planning time: 8.744 ms
 Execution time: 39843.869 ms
(57 rows)

COMMIT;
COMMIT