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', 'RAIL')
	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=990335.29..990335.30 rows=1 width=27) (actual time=70858.673..70858.673 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=1119700 read=249833 dirtied=66 written=1281
   ->  HashAggregate  (cost=990335.27..990335.28 rows=1 width=27) (actual time=70858.532..70858.533 rows=2 loops=1)
         Buffers: shared hit=1119695 read=249833 dirtied=66 written=1281
         ->  Hash Join  (cost=597265.22..985179.14 rows=294636 width=27) (actual time=23456.770..70122.363 rows=311624 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=1119695 read=249833 dirtied=66 written=1281
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..378706.55 rows=294636 width=15) (actual time=0.486..45363.128 rows=311624 loops=1)
                     Filter: ((l_shipmode = ANY ('{SHIP,RAIL}'::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: 6877795
                     Buffers: shared hit=893467 read=220004 dirtied=66 written=72
               ->  Hash  (cost=407703.43..407703.43 rows=15164943 width=20) (actual time=23445.353..23445.353 rows=15000000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 761719kB
                     Buffers: shared hit=226225 read=29829 written=1209
                     ->  Seq Scan on orders  (cost=0.00..407703.43 rows=15164943 width=20) (actual time=0.028..15556.138 rows=15000000 loops=1)
                           Buffers: shared hit=226225 read=29829 written=1209
 Total runtime: 70938.461 ms
(19 rows)

COMMIT;
COMMIT