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', '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=981035.08..981035.09 rows=1 width=27) (actual time=30099.266..30099.266 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=734043 read=624619 dirtied=830 written=979
   ->  HashAggregate  (cost=981035.06..981035.07 rows=1 width=27) (actual time=30099.187..30099.188 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=734038 read=624619 dirtied=830 written=979
         ->  Hash Join  (cost=591949.71..975991.92 rows=288180 width=27) (actual time=14632.959..29797.646 rows=310697 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=734038 read=624619 dirtied=830 written=979
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..375037.01 rows=288180 width=15) (actual time=0.398..14651.413 rows=310697 loops=1)
                     Filter: ((l_shipmode = ANY ('{FOB,MAIL}'::bpchar[])) AND (l_receiptdate >= '1997-01-01'::date) AND (l_receiptdate < '1998-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6879273
                     Buffers: shared hit=523523 read=581356 dirtied=830 written=302
               ->  Hash  (cost=404074.68..404074.68 rows=15029968 width=20) (actual time=14033.907..14033.907 rows=15000000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 892791kB
                     Buffers: shared hit=210512 read=43263 written=677
                     ->  Seq Scan on orders  (cost=0.00..404074.68 rows=15029968 width=20) (actual time=0.037..5675.264 rows=15000000 loops=1)
                           Buffers: shared hit=210512 read=43263 written=677
 Planning time: 4.121 ms
 Execution time: 30119.899 ms
(21 rows)

COMMIT;
COMMIT