BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	o_orderpriority,
	count(*) as order_count
from
	orders
where
	o_orderdate >= date '1993-09-01'
	and o_orderdate < cast(date '1993-09-01' + 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=1286028.41..1286028.42 rows=1 width=16) (actual time=59639.036..59639.037 rows=5 loops=1)
   Sort Key: orders.o_orderpriority
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=343067 read=1150817
   ->  HashAggregate  (cost=1286028.39..1286028.40 rows=1 width=16) (actual time=59638.865..59638.867 rows=5 loops=1)
         Buffers: shared hit=343062 read=1150817
         ->  Hash Join  (cost=1017855.09..1285262.89 rows=153100 width=16) (actual time=50952.960..59469.993 rows=520428 loops=1)
               Hash Cond: (orders.o_orderkey = lineitem.l_orderkey)
               Buffers: shared hit=343062 read=1150817
               ->  Bitmap Heap Scan on orders  (cost=11946.47..273916.14 rows=563178 width=20) (actual time=229.887..1585.168 rows=567853 loops=1)
                     Recheck Cond: ((o_orderdate >= '1993-09-01'::date) AND (o_orderdate < '1993-12-01'::date))
                     Buffers: shared hit=202131 read=27061
                     ->  Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx  (cost=0.00..11805.68 rows=563178 width=0) (actual time=159.711..159.711 rows=567853 loops=1)
                           Index Cond: ((o_orderdate >= '1993-09-01'::date) AND (o_orderdate < '1993-12-01'::date))
                           Buffers: shared read=1554
               ->  Hash  (cost=988901.03..988901.03 rows=1360607 width=4) (actual time=50721.643..50721.643 rows=13767196 loops=1)
                     Buckets: 262144  Batches: 1  Memory Usage: 484003kB
                     Buffers: shared hit=140931 read=1123756
                     ->  HashAggregate  (cost=975294.96..988901.03 rows=1360607 width=4) (actual time=38454.005..47884.708 rows=13767196 loops=1)
                           Buffers: shared hit=140931 read=1123756
                           ->  Index Scan using lineitem_l_orderkey_idx_part1 on lineitem  (cost=0.00..925257.52 rows=20014977 width=4) (actual time=0.164..17587.958 rows=37967116 loops=1)
                                 Buffers: shared hit=140931 read=1123756
 Total runtime: 59715.643 ms
(23 rows)

COMMIT;
COMMIT