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', 'TRUCK')
	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=980294.33..980294.34 rows=1 width=27) (actual time=19703.013..19703.014 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=1247601 read=110689 dirtied=58 written=310
   ->  HashAggregate  (cost=980294.31..980294.32 rows=1 width=27) (actual time=19702.934..19702.935 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=1247596 read=110689 dirtied=58 written=310
         ->  Hash Join  (cost=591359.57..975244.65 rows=288552 width=27) (actual time=10031.577..19420.182 rows=310980 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=1247596 read=110689 dirtied=58 written=310
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..374868.26 rows=288552 width=15) (actual time=0.091..9119.961 rows=310980 loops=1)
                     Filter: ((l_shipmode = ANY ('{"REG AIR",TRUCK}'::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: 6879124
                     Buffers: shared hit=1015105 read=89655 dirtied=58 written=14
               ->  Hash  (cost=403671.84..403671.84 rows=15014984 width=20) (actual time=9946.374..9946.374 rows=15000000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 892791kB
                     Buffers: shared hit=232488 read=21034 written=296
                     ->  Seq Scan on orders  (cost=0.00..403671.84 rows=15014984 width=20) (actual time=0.023..5121.823 rows=15000000 loops=1)
                           Buffers: shared hit=232488 read=21034 written=296
 Planning time: 2.784 ms
 Execution time: 19707.992 ms
(21 rows)

COMMIT;
COMMIT