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', 'FOB')
	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=985053.74..985053.74 rows=1 width=27) (actual time=24902.897..24902.898 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=270512 read=1096631 dirtied=452 written=23653
   ->  HashAggregate  (cost=985053.72..985053.73 rows=1 width=27) (actual time=24902.840..24902.841 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=270507 read=1096631 dirtied=452 written=23653
         ->  Hash Join  (cost=594310.27..979951.12 rows=291577 width=27) (actual time=10369.088..24614.544 rows=311470 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=270507 read=1096631 dirtied=452 written=23653
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..376529.50 rows=291577 width=15) (actual time=0.151..13852.776 rows=311470 loops=1)
                     Filter: ((l_shipmode = ANY ('{SHIP,FOB}'::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: 6878144
                     Buffers: shared hit=75429 read=1036919 dirtied=430 written=19737
               ->  Hash  (cost=405686.04..405686.04 rows=15089904 width=20) (actual time=10026.263..10026.263 rows=15000000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 892791kB
                     Buffers: shared hit=195075 read=59712 dirtied=22 written=3916
                     ->  Seq Scan on orders  (cost=0.00..405686.04 rows=15089904 width=20) (actual time=0.013..4965.496 rows=15000000 loops=1)
                           Buffers: shared hit=195075 read=59712 dirtied=22 written=3916
 Planning time: 3.084 ms
 Execution time: 24925.877 ms
(21 rows)

COMMIT;
COMMIT