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', 'SHIP')
	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=988725.17..988725.18 rows=1 width=27) (actual time=24730.192..24730.192 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=1082721 read=278979 written=10159
   ->  HashAggregate  (cost=988725.15..988725.16 rows=1 width=27) (actual time=24730.124..24730.125 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=1082716 read=278979 written=10159
         ->  Hash Join  (cost=596675.51..983629.98 rows=291153 width=27) (actual time=10326.689..24402.030 rows=311446 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=1082716 read=278979 written=10159
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..377856.37 rows=291153 width=15) (actual time=0.064..13575.239 rows=311446 loops=1)
                     Filter: ((l_shipmode = ANY ('{"REG AIR",SHIP}'::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: 6885116
                     Buffers: shared hit=826912 read=278979 written=10159
               ->  Hash  (cost=407300.59..407300.59 rows=15149959 width=20) (actual time=10219.020..10219.020 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=255801
                     ->  Seq Scan on orders  (cost=0.00..407300.59 rows=15149959 width=20) (actual time=0.020..5000.937 rows=15015000 loops=1)
                           Buffers: shared hit=255801
 Planning time: 2.714 ms
 Execution time: 24758.178 ms
(21 rows)

COMMIT;
COMMIT