BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	o_orderpriority,
	count(*) as order_count
from
	orders
where
	o_orderdate >= date '1997-03-01'
	and o_orderdate < cast(date '1997-03-01' + 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=1298796.00..1298796.00 rows=1 width=16) (actual time=75825.072..75825.073 rows=5 loops=1)
   Sort Key: orders.o_orderpriority
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=1154368 read=350748
   ->  HashAggregate  (cost=1298795.98..1298795.99 rows=1 width=16) (actual time=75824.923..75824.925 rows=5 loops=1)
         Buffers: shared hit=1154363 read=350748
         ->  Hash Join  (cost=1027651.83..1298028.54 rows=153488 width=16) (actual time=64954.785..75628.256 rows=525941 loops=1)
               Hash Cond: (orders.o_orderkey = lineitem.l_orderkey)
               Buffers: shared hit=1154363 read=350748
               ->  Bitmap Heap Scan on orders  (cost=12630.56..277407.34 rows=581519 width=20) (actual time=301.691..1587.358 rows=573877 loops=1)
                     Recheck Cond: ((o_orderdate >= '1997-03-01'::date) AND (o_orderdate < '1997-06-01'::date))
                     Buffers: shared hit=230433 read=1696
                     ->  Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx  (cost=0.00..12485.18 rows=581519 width=0) (actual time=219.903..219.903 rows=580035 loops=1)
                           Index Cond: ((o_orderdate >= '1997-03-01'::date) AND (o_orderdate < '1997-06-01'::date))
                           Buffers: shared read=1664
               ->  Hash  (cost=998343.39..998343.39 rows=1334231 width=4) (actual time=64651.641..64651.641 rows=13753430 loops=1)
                     Buckets: 262144  Batches: 1  Memory Usage: 483520kB
                     Buffers: shared hit=923930 read=349052
                     ->  HashAggregate  (cost=985001.08..998343.39 rows=1334231 width=4) (actual time=49749.554..60050.636 rows=13753430 loops=1)
                           Buffers: shared hit=923930 read=349052
                           ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem  (cost=0.00..934463.38 rows=20215079 width=4) (actual time=0.109..20760.605 rows=37927978 loops=1)
                                 Buffers: shared hit=923930 read=349052
 Total runtime: 76180.884 ms
(23 rows)

COMMIT;
COMMIT