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 ('FOB', 'REG AIR')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1995-01-01'
	and l_receiptdate < date '1995-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                            QUERY PLAN                                                                                             
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=986005.95..986005.96 rows=1 width=27) (actual time=24717.717..24717.718 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=535381 read=832159 dirtied=121 written=2168
   ->  HashAggregate  (cost=986005.93..986005.94 rows=1 width=27) (actual time=24717.660..24717.661 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=535376 read=832159 dirtied=121 written=2168
         ->  Hash Join  (cost=594310.27..980850.65 rows=294588 width=27) (actual time=10482.757..24426.382 rows=312579 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=535376 read=832159 dirtied=121 written=2168
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..377334.93 rows=294588 width=15) (actual time=0.141..13629.540 rows=312579 loops=1)
                     Filter: ((l_shipmode = ANY ('{FOB,"REG AIR"}'::bpchar[])) AND (l_receiptdate >= '1995-01-01'::date) AND (l_receiptdate < '1996-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6877035
                     Buffers: shared hit=392985 read=719760 dirtied=121 written=86
               ->  Hash  (cost=405686.04..405686.04 rows=15089904 width=20) (actual time=10340.665..10340.665 rows=15000000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 892791kB
                     Buffers: shared hit=142388 read=112399 written=2082
                     ->  Seq Scan on orders  (cost=0.00..405686.04 rows=15089904 width=20) (actual time=0.017..5347.460 rows=15000000 loops=1)
                           Buffers: shared hit=142388 read=112399 written=2082
 Planning time: 2.561 ms
 Execution time: 24740.367 ms
(21 rows)

COMMIT;
COMMIT