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 ('SHIP', '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=3055994.36..3055994.36 rows=1 width=27) (actual time=33346.672..33346.672 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=1067218 read=267283 written=968
   ->  HashAggregate  (cost=3055994.34..3055994.35 rows=1 width=27) (actual time=33346.621..33346.623 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=1067213 read=267283 written=968
         ->  Hash Join  (cost=597855.36..3050937.26 rows=288976 width=27) (actual time=9348.970..33054.537 rows=311536 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=1067213 read=267283 written=968
               ->  Seq Scan on lineitem  (cost=0.00..2444051.40 rows=288976 width=15) (actual time=0.262..23383.337 rows=311536 loops=1)
                     Filter: ((l_shipmode = ANY ('{SHIP,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: 59733458
                     Buffers: shared hit=861608 read=216578
               ->  Hash  (cost=408106.27..408106.27 rows=15179927 width=20) (actual time=9295.625..9295.625 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=205602 read=50705 written=968
                     ->  Seq Scan on orders  (cost=0.00..408106.27 rows=15179927 width=20) (actual time=0.012..4405.115 rows=15015000 loops=1)
                           Buffers: shared hit=205602 read=50705 written=968
 Planning time: 2.222 ms
 Execution time: 33354.452 ms
(21 rows)

COMMIT;
COMMIT