BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	l_shipmode,
	sum(case
		when o_orderpriority = '1-URGENT'
			or o_orderpriority = '2-HIGH'
			then 1
		else 0
	end) as high_line_count,
	sum(case
		when o_orderpriority <> '1-URGENT'
			and o_orderpriority <> '2-HIGH'
			then 1
		else 0
	end) as low_line_count
from
	orders,
	lineitem
where
	o_orderkey = l_orderkey
	and l_shipmode in ('REG AIR', 'AIR')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1995-01-01'
	and l_receiptdate < date '1995-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                            QUERY PLAN                                                                                             
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=991576.14..991576.14 rows=1 width=27) (actual time=22828.027..22828.027 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=793866 read=576442 dirtied=1595 written=5474
   ->  HashAggregate  (cost=991576.12..991576.13 rows=1 width=27) (actual time=22827.963..22827.965 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=793861 read=576442 dirtied=1595 written=5474
         ->  Hash Join  (cost=598445.93..986497.36 rows=290215 width=27) (actual time=11369.968..22559.228 rows=312537 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=793861 read=576442 dirtied=1595 written=5474
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..378982.64 rows=290215 width=15) (actual time=0.195..10840.081 rows=312537 loops=1)
                     Filter: ((l_shipmode = ANY ('{"REG AIR",AIR}'::bpchar[])) AND (l_receiptdate >= '1995-01-01'::date) AND (l_receiptdate < '1996-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6876934
                     Buffers: shared hit=697109 read=416631 dirtied=1087 written=4896
               ->  Hash  (cost=408509.11..408509.11 rows=15194911 width=20) (actual time=11311.417..11311.417 rows=15000000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 892791kB
                     Buffers: shared hit=96749 read=159811 dirtied=508 written=578
                     ->  Seq Scan on orders  (cost=0.00..408509.11 rows=15194911 width=20) (actual time=0.014..5428.130 rows=15000000 loops=1)
                           Buffers: shared hit=96749 read=159811 dirtied=508 written=578
 Planning time: 2.810 ms
 Execution time: 22834.057 ms
(21 rows)

COMMIT;
COMMIT