BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	o_orderpriority,
	count(*) as order_count
from
	orders
where
	o_orderdate >= date '1997-09-01'
	and o_orderdate < cast(date '1997-09-01' + interval '3 month' as date)
	and exists (
		select
			*
		from
			lineitem
		where
			l_orderkey = o_orderkey
			and l_commitdate < l_receiptdate
	)
group by
	o_orderpriority
order by
	o_orderpriority;
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=1295090.91..1295090.91 rows=1 width=16) (actual time=83691.533..83691.535 rows=5 loops=1)
   Sort Key: orders.o_orderpriority
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=952516 read=561035 dirtied=1062 written=686
   ->  HashAggregate  (cost=1295090.89..1295090.90 rows=1 width=16) (actual time=83691.389..83691.390 rows=5 loops=1)
         Buffers: shared hit=952511 read=561035 dirtied=1062 written=686
         ->  Hash Join  (cost=1024826.51..1294315.80 rows=155017 width=16) (actual time=71542.906..83332.457 rows=519671 loops=1)
               Hash Cond: (orders.o_orderkey = lineitem.l_orderkey)
               Buffers: shared hit=952511 read=561035 dirtied=1062 written=686
               ->  Bitmap Heap Scan on orders  (cost=12480.93..276414.40 rows=575898 width=20) (actual time=509.765..2908.309 rows=567035 loops=1)
                     Recheck Cond: ((o_orderdate >= '1997-09-01'::date) AND (o_orderdate < '1997-12-01'::date))
                     Buffers: shared hit=227939 read=2771 written=186
                     ->  Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx  (cost=0.00..12336.96 rows=575898 width=0) (actual time=377.983..377.983 rows=570857 loops=1)
                           Index Cond: ((o_orderdate >= '1997-09-01'::date) AND (o_orderdate < '1997-12-01'::date))
                           Buffers: shared hit=94 read=1535
               ->  Hash  (cost=995387.56..995387.56 rows=1356641 width=4) (actual time=71031.085..71031.085 rows=13767175 loops=1)
                     Buckets: 262144  Batches: 1  Memory Usage: 484003kB
                     Buffers: shared hit=724572 read=558264 dirtied=1062 written=500
                     ->  HashAggregate  (cost=981821.15..995387.56 rows=1356641 width=4) (actual time=56464.934..66624.373 rows=13767175 loops=1)
                           Buffers: shared hit=724572 read=558264 dirtied=1062 written=500
                           ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem  (cost=0.00..931434.07 rows=20154834 width=4) (actual time=0.147..25655.078 rows=37965693 loops=1)
                                 Buffers: shared hit=724572 read=558264 dirtied=1062 written=500
 Total runtime: 83990.913 ms
(23 rows)

COMMIT;
COMMIT