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', 'MAIL')
	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=989149.94..989149.95 rows=1 width=27) (actual time=25473.112..25473.113 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=654537 read=712675 dirtied=887 written=9268
   ->  HashAggregate  (cost=989149.92..989149.93 rows=1 width=27) (actual time=25473.055..25473.056 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=654532 read=712675 dirtied=887 written=9268
         ->  Hash Join  (cost=596675.51..984027.15 rows=292730 width=27) (actual time=11249.796..25169.506 rows=313311 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=654532 read=712675 dirtied=887 written=9268
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..378204.26 rows=292730 width=15) (actual time=0.395..13562.470 rows=313311 loops=1)
                     Filter: ((l_shipmode = ANY ('{"REG AIR",MAIL}'::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: 6876059
                     Buffers: shared hit=501378 read=610025 dirtied=755 written=5629
               ->  Hash  (cost=407300.59..407300.59 rows=15149959 width=20) (actual time=11130.897..11130.897 rows=15000000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 892791kB
                     Buffers: shared hit=153151 read=102650 dirtied=132 written=3639
                     ->  Seq Scan on orders  (cost=0.00..407300.59 rows=15149959 width=20) (actual time=0.021..5805.364 rows=15000000 loops=1)
                           Buffers: shared hit=153151 read=102650 dirtied=132 written=3639
 Planning time: 3.350 ms
 Execution time: 25491.745 ms
(21 rows)

COMMIT;
COMMIT