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 ('AIR', 'FOB')
	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=992126.05..992126.06 rows=1 width=27) (actual time=25459.138..25459.139 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=676347 read=697496 dirtied=112 written=1064
   ->  HashAggregate  (cost=992126.03..992126.04 rows=1 width=27) (actual time=25459.083..25459.085 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=676342 read=697496 dirtied=112 written=1064
         ->  Hash Join  (cost=598445.93..986976.18 rows=294277 width=27) (actual time=11214.432..25154.525 rows=310980 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=676342 read=697496 dirtied=112 written=1064
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..379334.53 rows=294277 width=15) (actual time=0.284..13614.533 rows=310980 loops=1)
                     Filter: ((l_shipmode = ANY ('{AIR,FOB}'::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: 6885690
                     Buffers: shared hit=518407 read=598868 dirtied=112 written=962
               ->  Hash  (cost=408509.11..408509.11 rows=15194911 width=20) (actual time=11014.851..11014.851 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=157932 read=98628 written=102
                     ->  Seq Scan on orders  (cost=0.00..408509.11 rows=15194911 width=20) (actual time=0.023..5586.730 rows=15015000 loops=1)
                           Buffers: shared hit=157932 read=98628 written=102
 Planning time: 3.511 ms
 Execution time: 25481.566 ms
(21 rows)

COMMIT;
COMMIT