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 = 'ROMANIA'
group by
	s_name
order by
	numwait desc,
	s_name
LIMIT 100;
                                                                                                 QUERY PLAN                                                                                                 
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=1962460.70..1962460.70 rows=1 width=26) (actual time=49000.170..49000.190 rows=100 loops=1)
   Buffers: shared hit=13939954 read=736600 written=7387
   ->  Sort  (cost=1962460.70..1962460.70 rows=1 width=26) (actual time=49000.166..49000.171 rows=100 loops=1)
         Sort Key: (count(*)), supplier.s_name
         Sort Method: top-N heapsort  Memory: 32kB
         Buffers: shared hit=13939954 read=736600 written=7387
         ->  HashAggregate  (cost=1962460.68..1962460.69 rows=1 width=26) (actual time=48997.013..48998.900 rows=4029 loops=1)
               Group Key: supplier.s_name
               Buffers: shared hit=13939946 read=736600 written=7387
               ->  Nested Loop Anti Join  (cost=2443.74..1962460.67 rows=1 width=26) (actual time=20.868..48913.560 rows=39748 loops=1)
                     Buffers: shared hit=13939946 read=736600 written=7387
                     ->  Nested Loop Semi Join  (cost=2443.17..1962459.36 rows=1 width=34) (actual time=17.872..45519.887 rows=712159 loops=1)
                           Join Filter: (orders.o_orderkey = l2.l_orderkey)
                           Buffers: shared hit=10372819 read=734622 written=7365
                           ->  Nested Loop  (cost=2442.61..1440487.80 rows=390631 width=38) (actual time=17.850..39649.800 rows=738703 loops=1)
                                 Buffers: shared hit=6814005 read=593796 written=5767
                                 ->  Hash Join  (cost=2442.17..1016485.17 rows=805397 width=34) (actual time=17.648..30083.632 rows=1529009 loops=1)
                                       Hash Cond: (l1.l_suppkey = supplier.s_suppkey)
                                       Buffers: shared hit=714521 read=568843 written=5749
                                       ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem l1  (cost=0.56..930483.65 rows=20134919 width=8) (actual time=0.094..20863.633 rows=37966100 loops=1)
                                             Buffers: shared hit=712676 read=568830 written=5749
                                       ->  Hash  (cost=2391.61..2391.61 rows=4000 width=30) (actual time=17.496..17.496 rows=4029 loops=1)
                                             Buckets: 4096  Batches: 1  Memory Usage: 284kB
                                             Buffers: shared hit=1842 read=13
                                             ->  Nested Loop  (cost=79.29..2391.61 rows=4000 width=30) (actual time=1.262..16.241 rows=4029 loops=1)
                                                   Buffers: shared hit=1842 read=13
                                                   ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.011..0.017 rows=1 loops=1)
                                                         Filter: (n_name = 'ROMANIA'::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=1.244..15.370 rows=4029 loops=1)
                                                         Recheck Cond: (s_nationkey = nation.n_nationkey)
                                                         Heap Blocks: exact=1841
                                                         Buffers: shared hit=1841 read=13
                                                         ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.29 rows=4000 width=0) (actual time=0.938..0.938 rows=4029 loops=1)
                                                               Index Cond: (s_nationkey = nation.n_nationkey)
                                                               Buffers: shared read=13
                                 ->  Index Scan using orders_o_orderkey_o_orderdate_idx on orders  (cost=0.43..0.52 rows=1 width=4) (actual time=0.005..0.006 rows=0 loops=1529009)
                                       Index Cond: (o_orderkey = l1.l_orderkey)
                                       Filter: (o_orderstatus = 'F'::bpchar)
                                       Rows Removed by Filter: 1
                                       Buffers: shared hit=6099484 read=24953 written=18
                           ->  Index Scan using lineitem_l_orderkey_idx on lineitem l2  (cost=0.56..1.15 rows=15 width=8) (actual time=0.007..0.007 rows=1 loops=738703)
                                 Index Cond: (l_orderkey = l1.l_orderkey)
                                 Filter: (l_suppkey <> l1.l_suppkey)
                                 Rows Removed by Filter: 0
                                 Buffers: shared hit=3558814 read=140826 written=1598
                     ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem l3  (cost=0.56..0.91 rows=5 width=8) (actual time=0.004..0.004 rows=1 loops=712159)
                           Index Cond: (l_orderkey = l1.l_orderkey)
                           Filter: (l_suppkey <> l1.l_suppkey)
                           Rows Removed by Filter: 0
                           Buffers: shared hit=3567127 read=1978 written=22
 Planning time: 10.999 ms
 Execution time: 49000.596 ms
(54 rows)

COMMIT;
COMMIT