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 ('MAIL', 'TRUCK')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1996-01-01'
	and l_receiptdate < date '1996-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                           QUERY PLAN                                                                                           
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=988000.03..988000.03 rows=1 width=27) (actual time=27106.559..27106.560 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=1174044 read=187388 dirtied=5 written=1794
   ->  HashAggregate  (cost=988000.01..988000.02 rows=1 width=27) (actual time=27106.501..27106.502 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=1174039 read=187388 dirtied=5 written=1794
         ->  Hash Join  (cost=596085.37..982877.14 rows=292735 width=27) (actual time=11674.924..26679.005 rows=312636 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=1174039 read=187388 dirtied=5 written=1794
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..377644.24 rows=292735 width=15) (actual time=0.097..14398.573 rows=312636 loops=1)
                     Filter: ((l_shipmode = ANY ('{MAIL,TRUCK}'::bpchar[])) AND (l_receiptdate >= '1996-01-01'::date) AND (l_receiptdate < '1997-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6883906
                     Buffers: shared hit=948508 read=157368 dirtied=5 written=1753
               ->  Hash  (cost=406897.75..406897.75 rows=15134975 width=20) (actual time=11551.778..11551.778 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=225528 read=30020 written=41
                     ->  Seq Scan on orders  (cost=0.00..406897.75 rows=15134975 width=20) (actual time=0.022..5487.732 rows=15015000 loops=1)
                           Buffers: shared hit=225528 read=30020 written=41
 Planning time: 2.953 ms
 Execution time: 27129.235 ms
(21 rows)

COMMIT;
COMMIT