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', 'MAIL')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1994-01-01'
	and l_receiptdate < date '1994-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                           QUERY PLAN                                                                                           
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=994815.92..994815.92 rows=1 width=27) (actual time=84543.817..84543.818 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=945464 read=429585 dirtied=621 written=38
   ->  HashAggregate  (cost=994815.90..994815.91 rows=1 width=27) (actual time=84543.655..84543.656 rows=2 loops=1)
         Buffers: shared hit=945459 read=429585 dirtied=621 written=38
         ->  Hash Join  (cost=600145.96..989674.07 rows=293819 width=27) (actual time=25660.380..83746.940 rows=310623 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=945459 read=429585 dirtied=621 written=38
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..380346.26 rows=293819 width=15) (actual time=0.389..56445.989 rows=310623 loops=1)
                     Filter: ((l_shipmode = ANY ('{TRUCK,MAIL}'::bpchar[])) AND (l_receiptdate >= '1994-01-01'::date) AND (l_receiptdate < '1995-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6878748
                     Buffers: shared hit=697093 read=420659 dirtied=398 written=23
               ->  Hash  (cost=409669.87..409669.87 rows=15238087 width=20) (actual time=25642.316..25642.316 rows=15000000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 761719kB
                     Buffers: shared hit=248363 read=8926 dirtied=223 written=15
                     ->  Seq Scan on orders  (cost=0.00..409669.87 rows=15238087 width=20) (actual time=0.030..15071.620 rows=15000000 loops=1)
                           Buffers: shared hit=248363 read=8926 dirtied=223 written=15
 Total runtime: 84689.048 ms
(19 rows)

COMMIT;
COMMIT