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 ('SHIP', '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=985928.29..985928.30 rows=1 width=27) (actual time=26241.736..26241.737 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=1008565 read=359229 dirtied=74 written=1007
   ->  HashAggregate  (cost=985928.27..985928.28 rows=1 width=27) (actual time=26241.655..26241.656 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=1008560 read=359229 dirtied=74 written=1007
         ->  Hash Join  (cost=594902.76..980857.61 rows=289752 width=27) (actual time=14166.278..25936.750 rows=311578 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=1008560 read=359229 dirtied=74 written=1007
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..376900.53 rows=289752 width=15) (actual time=0.176..11356.761 rows=311578 loops=1)
                     Filter: ((l_shipmode = ANY ('{SHIP,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: 6885191
                     Buffers: shared hit=856590 read=256155 dirtied=74 written=985
               ->  Hash  (cost=406090.48..406090.48 rows=15104948 width=20) (actual time=12612.102..12612.102 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=151967 read=103074 written=22
                     ->  Seq Scan on orders  (cost=0.00..406090.48 rows=15104948 width=20) (actual time=0.038..6117.239 rows=15015000 loops=1)
                           Buffers: shared hit=151967 read=103074 written=22
 Planning time: 5.084 ms
 Execution time: 26262.564 ms
(21 rows)

COMMIT;
COMMIT