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 ('FOB', 'AIR')
	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=992375.46..992375.46 rows=1 width=27) (actual time=22988.508..22988.509 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=1100286 read=266199 dirtied=57 written=12557
   ->  HashAggregate  (cost=992375.44..992375.45 rows=1 width=27) (actual time=22988.434..22988.437 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=1100281 read=266199 dirtied=57 written=12557
         ->  Hash Join  (cost=598445.93..987228.81 rows=294093 width=27) (actual time=10933.458..22667.890 rows=312738 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=1100281 read=266199 dirtied=57 written=12557
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..379592.91 rows=294093 width=15) (actual time=0.075..11202.926 rows=312738 loops=1)
                     Filter: ((l_shipmode = ANY ('{FOB,AIR}'::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: 6883932
                     Buffers: shared hit=905420 read=204497 dirtied=57 written=12455
               ->  Hash  (cost=408509.11..408509.11 rows=15194911 width=20) (actual time=10811.132..10811.132 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=194858 read=61702 written=102
                     ->  Seq Scan on orders  (cost=0.00..408509.11 rows=15194911 width=20) (actual time=0.016..5301.843 rows=15015000 loops=1)
                           Buffers: shared hit=194858 read=61702 written=102
 Planning time: 3.162 ms
 Execution time: 23016.073 ms
(21 rows)

COMMIT;
COMMIT