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 '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=3042403.92..3042403.93 rows=1 width=27) (actual time=34120.876..34120.877 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=687015 read=641562 dirtied=254 written=2070
   ->  HashAggregate  (cost=3042403.90..3042403.91 rows=1 width=27) (actual time=34120.823..34120.823 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=687010 read=641562 dirtied=254 written=2070
         ->  Hash Join  (cost=594902.33..3037375.03 rows=287364 width=27) (actual time=9657.297..33781.772 rows=310770 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=687010 read=641562 dirtied=254 written=2070
               ->  Seq Scan on lineitem  (cost=0.00..2433492.58 rows=287364 width=15) (actual time=0.084..23803.785 rows=310770 loops=1)
                     Filter: ((l_shipmode = ANY ('{"REG AIR",MAIL}'::bpchar[])) AND (l_commitdate < l_receiptdate) AND (l_shipdate < l_commitdate) AND (l_receiptdate >= '1997-01-01'::date) AND (l_receiptdate < '1998-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 59674139
                     Buffers: shared hit=472348 read=601180 written=1
               ->  Hash  (cost=406090.48..406090.48 rows=15104948 width=20) (actual time=9587.124..9587.124 rows=15000000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 892791kB
                     Buffers: shared hit=214659 read=40382 dirtied=254 written=2069
                     ->  Seq Scan on orders  (cost=0.00..406090.48 rows=15104948 width=20) (actual time=0.011..4454.089 rows=15000000 loops=1)
                           Buffers: shared hit=214659 read=40382 dirtied=254 written=2069
 Planning time: 2.209 ms
 Execution time: 34125.009 ms
(21 rows)

COMMIT;
COMMIT