BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	o_orderpriority,
	count(*) as order_count
from
	orders
where
	o_orderdate >= date '1997-05-01'
	and o_orderdate < cast(date '1997-05-01' + 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=1289203.32..1289203.33 rows=1 width=16) (actual time=90885.287..90885.288 rows=5 loops=1)
   Sort Key: orders.o_orderpriority
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=969773 read=537190 dirtied=1264 written=1439
   ->  HashAggregate  (cost=1289203.30..1289203.31 rows=1 width=16) (actual time=90885.136..90885.138 rows=5 loops=1)
         Buffers: shared hit=969768 read=537190 dirtied=1264 written=1439
         ->  Hash Join  (cost=1020404.77..1288430.81 rows=154499 width=16) (actual time=77641.708..90525.185 rows=526516 loops=1)
               Hash Cond: (orders.o_orderkey = lineitem.l_orderkey)
               Buffers: shared hit=969768 read=537190 dirtied=1264 written=1439
               ->  Bitmap Heap Scan on orders  (cost=12032.89..274576.50 rows=567707 width=20) (actual time=568.009..2836.784 rows=574491 loops=1)
                     Recheck Cond: ((o_orderdate >= '1997-05-01'::date) AND (o_orderdate < '1997-08-01'::date))
                     Buffers: shared hit=204383 read=26171 dirtied=26 written=1248
                     ->  Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx  (cost=0.00..11890.97 rows=567707 width=0) (actual time=402.347..402.347 rows=575657 loops=1)
                           Index Cond: ((o_orderdate >= '1997-05-01'::date) AND (o_orderdate < '1997-08-01'::date))
                           Buffers: shared hit=87 read=1485 written=9
               ->  Hash  (cost=991311.77..991311.77 rows=1364808 width=4) (actual time=77071.472..77071.472 rows=13767168 loops=1)
                     Buckets: 262144  Batches: 1  Memory Usage: 484002kB
                     Buffers: shared hit=765385 read=511019 dirtied=1238 written=191
                     ->  HashAggregate  (cost=977663.69..991311.77 rows=1364808 width=4) (actual time=61981.151..70635.714 rows=13767168 loops=1)
                           Buffers: shared hit=765385 read=511019 dirtied=1238 written=191
                           ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem  (cost=0.00..927526.04 rows=20055063 width=4) (actual time=0.300..28879.307 rows=37966418 loops=1)
                                 Buffers: shared hit=765385 read=511019 dirtied=1238 written=191
 Total runtime: 91188.808 ms
(23 rows)

COMMIT;
COMMIT