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', 'MAIL')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1997-01-01'
	and l_receiptdate < date '1997-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                             QUERY PLAN                                                                                             
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=985482.48..985482.49 rows=1 width=27) (actual time=26771.852..26771.852 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=952278 read=411438 dirtied=995 written=14775
   ->  HashAggregate  (cost=985482.46..985482.47 rows=1 width=27) (actual time=26771.790..26771.791 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=952273 read=411438 dirtied=995 written=14775
         ->  Hash Join  (cost=594310.27..980383.32 rows=291380 width=27) (actual time=10899.696..26410.857 rows=311058 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=952273 read=411438 dirtied=995 written=14775
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..376967.85 rows=291380 width=15) (actual time=0.125..14943.668 rows=311058 loops=1)
                     Filter: ((l_shipmode = ANY ('{"REG AIR",MAIL}'::bpchar[])) AND (l_receiptdate >= '1997-01-01'::date) AND (l_receiptdate < '1998-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6885807
                     Buffers: shared hit=730034 read=378887 dirtied=995 written=14771
               ->  Hash  (cost=405686.04..405686.04 rows=15089904 width=20) (actual time=10437.040..10437.040 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=222236 read=32551 written=4
                     ->  Seq Scan on orders  (cost=0.00..405686.04 rows=15089904 width=20) (actual time=0.018..5275.861 rows=15015000 loops=1)
                           Buffers: shared hit=222236 read=32551 written=4
 Planning time: 3.300 ms
 Execution time: 26797.536 ms
(21 rows)

COMMIT;
COMMIT