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 ('TRUCK', '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=988936.05..988936.06 rows=1 width=27) (actual time=28133.011..28133.012 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=702729 read=658972 dirtied=549 written=12916
   ->  HashAggregate  (cost=988936.03..988936.04 rows=1 width=27) (actual time=28132.952..28132.953 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=702724 read=658972 dirtied=549 written=12916
         ->  Hash Join  (cost=596675.51..983825.09 rows=292054 width=27) (actual time=12836.884..27784.242 rows=312722 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=702724 read=658972 dirtied=549 written=12916
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..378023.32 rows=292054 width=15) (actual time=0.110..14546.401 rows=312722 loops=1)
                     Filter: ((l_shipmode = ANY ('{TRUCK,"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: 6883840
                     Buffers: shared hit=532525 read=573367 dirtied=549 written=12740
               ->  Hash  (cost=407300.59..407300.59 rows=15149959 width=20) (actual time=12597.192..12597.192 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=170196 read=85605 written=176
                     ->  Seq Scan on orders  (cost=0.00..407300.59 rows=15149959 width=20) (actual time=0.024..6596.412 rows=15015000 loops=1)
                           Buffers: shared hit=170196 read=85605 written=176
 Planning time: 3.528 ms
 Execution time: 28161.941 ms
(21 rows)

COMMIT;
COMMIT