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', 'SHIP')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1996-01-01'
	and l_receiptdate < date '1996-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                          QUERY PLAN                                                                                          
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=989720.81..989720.82 rows=1 width=27) (actual time=21868.934..21868.934 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=1142648 read=219238 dirtied=336 written=4397
   ->  HashAggregate  (cost=989720.79..989720.80 rows=1 width=27) (actual time=21868.877..21868.878 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=1142643 read=219238 dirtied=336 written=4397
         ->  Hash Join  (cost=596675.51..984586.82 rows=293370 width=27) (actual time=10937.166..21584.140 rows=312403 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=1142643 read=219238 dirtied=336 written=4397
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..378743.93 rows=293370 width=15) (actual time=0.086..10351.476 rows=312403 loops=1)
                     Filter: ((l_shipmode = ANY ('{FOB,SHIP}'::bpchar[])) AND (l_receiptdate >= '1996-01-01'::date) AND (l_receiptdate < '1997-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6884159
                     Buffers: shared hit=932964 read=173113 dirtied=83 written=4266
               ->  Hash  (cost=407300.59..407300.59 rows=15149959 width=20) (actual time=10830.028..10830.028 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=209676 read=46125 dirtied=253 written=131
                     ->  Seq Scan on orders  (cost=0.00..407300.59 rows=15149959 width=20) (actual time=0.019..5385.448 rows=15015000 loops=1)
                           Buffers: shared hit=209676 read=46125 dirtied=253 written=131
 Planning time: 3.215 ms
 Execution time: 21874.339 ms
(21 rows)

COMMIT;
COMMIT