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 ('RAIL', 'REG AIR')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1993-01-01'
	and l_receiptdate < date '1993-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                             QUERY PLAN                                                                                             
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=988008.61..988008.61 rows=1 width=27) (actual time=27971.531..27971.532 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=1124173 read=244435 dirtied=113 written=1654
   ->  HashAggregate  (cost=988008.59..988008.60 rows=1 width=27) (actual time=27971.461..27971.461 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=1124168 read=244435 dirtied=113 written=1654
         ->  Hash Join  (cost=596085.37..982882.64 rows=292911 width=27) (actual time=10991.205..27496.323 rows=312781 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=1124168 read=244435 dirtied=113 written=1654
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..377644.24 rows=292911 width=15) (actual time=0.468..15934.830 rows=312781 loops=1)
                     Filter: ((l_shipmode = ANY ('{RAIL,"REG AIR"}'::bpchar[])) AND (l_receiptdate >= '1993-01-01'::date) AND (l_receiptdate < '1994-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6883761
                     Buffers: shared hit=934575 read=178477 dirtied=113 written=1612
               ->  Hash  (cost=406897.75..406897.75 rows=15134975 width=20) (actual time=10930.900..10930.900 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=189590 read=65958 written=42
                     ->  Seq Scan on orders  (cost=0.00..406897.75 rows=15134975 width=20) (actual time=0.029..5878.123 rows=15015000 loops=1)
                           Buffers: shared hit=189590 read=65958 written=42
 Planning time: 4.266 ms
 Execution time: 27976.773 ms
(21 rows)

COMMIT;
COMMIT