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 = 'CANADA'
group by
	s_name
order by
	numwait desc,
	s_name
LIMIT 100;
                                                                                                  QUERY PLAN                                                                                                  
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2843301.51..2843301.51 rows=1 width=26) (actual time=37465.845..37465.863 rows=100 loops=1)
   Buffers: shared hit=14413102 read=127547 written=290
   ->  Sort  (cost=2843301.51..2843301.51 rows=1 width=26) (actual time=37465.844..37465.851 rows=100 loops=1)
         Sort Key: (count(*)), supplier.s_name
         Sort Method: top-N heapsort  Memory: 32kB
         Buffers: shared hit=14413102 read=127547 written=290
         ->  HashAggregate  (cost=2843301.49..2843301.50 rows=1 width=26) (actual time=37463.392..37464.675 rows=4054 loops=1)
               Group Key: supplier.s_name
               Buffers: shared hit=14413094 read=127547 written=290
               ->  Nested Loop Anti Join  (cost=2406.88..2843301.48 rows=1 width=26) (actual time=35.536..37407.124 rows=40120 loops=1)
                     Buffers: shared hit=14413094 read=127547 written=290
                     ->  Nested Loop Semi Join  (cost=2406.31..2843299.70 rows=1 width=34) (actual time=32.704..34537.508 rows=715962 loops=1)
                           Join Filter: (orders.o_orderkey = l2.l_orderkey)
                           Buffers: shared hit=10818631 read=127136 written=289
                           ->  Nested Loop  (cost=2405.75..2323251.22 rows=389239 width=38) (actual time=32.645..30388.819 rows=743234 loops=1)
                                 Buffers: shared hit=7119514 read=104473 written=78
                                 ->  Hash Join  (cost=2405.31..1902499.01 rows=799298 width=34) (actual time=32.443..22878.012 rows=1536728 loops=1)
                                       Hash Cond: (l1.l_suppkey = supplier.s_suppkey)
                                       Buffers: shared hit=990216 read=78442
                                       ->  Seq Scan on lineitem l1  (cost=0.00..1817043.65 rows=20015217 width=8) (actual time=0.012..16526.547 rows=37928797 loops=1)
                                             Filter: (l_receiptdate > l_commitdate)
                                             Rows Removed by Filter: 22056532
                                             Buffers: shared hit=988031 read=78442
                                       ->  Hash  (cost=2355.31..2355.31 rows=4000 width=30) (actual time=32.333..32.333 rows=4054 loops=1)
                                             Buckets: 4096  Batches: 1  Memory Usage: 286kB
                                             Buffers: shared hit=2182
                                             ->  Nested Loop  (cost=43.00..2355.31 rows=4000 width=30) (actual time=0.266..31.153 rows=4054 loops=1)
                                                   Buffers: shared hit=2182
                                                   ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.005..0.011 rows=1 loops=1)
                                                         Filter: (n_name = 'CANADA'::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=0.253..30.508 rows=4054 loops=1)
                                                         Recheck Cond: (s_nationkey = nation.n_nationkey)
                                                         Rows Removed by Index Recheck: 95946
                                                         Heap Blocks: lossy=2179
                                                         Buffers: shared hit=2181
                                                         ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_brin_idx  (cost=0.00..42.00 rows=4000 width=0) (actual time=0.237..0.237 rows=23040 loops=1)
                                                               Index Cond: (s_nationkey = nation.n_nationkey)
                                                               Buffers: shared hit=2
                                 ->  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=1536728)
                                       Index Cond: (o_orderkey = l1.l_orderkey)
                                       Filter: (o_orderstatus = 'F'::bpchar)
                                       Rows Removed by Filter: 1
                                       Buffers: shared hit=6129298 read=26031 written=78
                           ->  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=743234)
                                 Index Cond: (l_orderkey = l1.l_orderkey)
                                 Filter: (l_suppkey <> l1.l_suppkey)
                                 Rows Removed by Filter: 0
                                 Buffers: shared hit=3699117 read=22663 written=211
                     ->  Index Scan using pk_lineitem on lineitem l3  (cost=0.56..1.15 rows=5 width=8) (actual time=0.004..0.004 rows=1 loops=715962)
                           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=3594463 read=411 written=1
 Planning time: 8.255 ms
 Execution time: 37466.144 ms
(57 rows)

COMMIT;
COMMIT