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 '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=983263.64..983263.64 rows=1 width=27) (actual time=25366.166..25366.167 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=629589 read=733374 dirtied=843 written=35
   ->  HashAggregate  (cost=983263.61..983263.62 rows=1 width=27) (actual time=25366.103..25366.103 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=629584 read=733374 dirtied=843 written=35
         ->  Hash Join  (cost=593129.99..978176.08 rows=290716 width=27) (actual time=11602.207..25070.981 rows=312546 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=629584 read=733374 dirtied=843 written=35
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..375961.65 rows=290716 width=15) (actual time=0.296..13149.804 rows=312546 loops=1)
                     Filter: ((l_shipmode = ANY ('{SHIP,MAIL}'::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: 6884637
                     Buffers: shared hit=513671 read=595003 dirtied=361 written=29
               ->  Hash  (cost=404880.36..404880.36 rows=15059936 width=20) (actual time=11482.781..11482.781 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=115910 read=138371 dirtied=482 written=6
                     ->  Seq Scan on orders  (cost=0.00..404880.36 rows=15059936 width=20) (actual time=0.020..5913.077 rows=15015000 loops=1)
                           Buffers: shared hit=115910 read=138371 dirtied=482 written=6
 Planning time: 3.153 ms
 Execution time: 25384.812 ms
(21 rows)

COMMIT;
COMMIT