BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	o_orderpriority,
	count(*) as order_count
from
	orders
where
	o_orderdate >= date '1994-09-01'
	and o_orderdate < cast(date '1994-09-01' + 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=1301244.36..1301244.36 rows=1 width=16) (actual time=102770.847..102770.848 rows=5 loops=1)
   Sort Key: orders.o_orderpriority
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=834318 read=696724 dirtied=1890 written=12515
   ->  HashAggregate  (cost=1301244.34..1301244.35 rows=1 width=16) (actual time=102770.673..102770.675 rows=5 loops=1)
         Buffers: shared hit=834313 read=696724 dirtied=1890 written=12515
         ->  Hash Join  (cost=1029584.15..1300471.59 rows=154549 width=16) (actual time=88808.544..102361.199 rows=520908 loops=1)
               Hash Cond: (orders.o_orderkey = lineitem.l_orderkey)
               Buffers: shared hit=834313 read=696724 dirtied=1890 written=12515
               ->  Bitmap Heap Scan on orders  (cost=12631.08..277914.63 rows=581570 width=20) (actual time=460.856..3531.298 rows=568315 loops=1)
                     Recheck Cond: ((o_orderdate >= '1994-09-01'::date) AND (o_orderdate < '1994-12-01'::date))
                     Buffers: shared hit=194011 read=38385 written=11
                     ->  Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx  (cost=0.00..12485.69 rows=581570 width=0) (actual time=357.766..357.766 rows=575161 loops=1)
                           Index Cond: ((o_orderdate >= '1994-09-01'::date) AND (o_orderdate < '1994-12-01'::date))
                           Buffers: shared hit=546 read=1100
               ->  Hash  (cost=1000128.21..1000128.21 rows=1345988 width=4) (actual time=88346.172..88346.172 rows=13767194 loops=1)
                     Buckets: 262144  Batches: 1  Memory Usage: 484003kB
                     Buffers: shared hit=640302 read=658339 dirtied=1890 written=12504
                     ->  HashAggregate  (cost=986668.33..1000128.21 rows=1345988 width=4) (actual time=75757.449..84544.748 rows=13767194 loops=1)
                           Buffers: shared hit=640302 read=658339 dirtied=1890 written=12504
                           ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem  (cost=0.00..936030.48 rows=20255141 width=4) (actual time=0.226..38608.165 rows=37966199 loops=1)
                                 Buffers: shared hit=640302 read=658339 dirtied=1890 written=12504
 Total runtime: 103076.633 ms
(23 rows)

COMMIT;
COMMIT