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', 'FOB')
	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=987146.28..987146.29 rows=1 width=27) (actual time=40052.872..40052.872 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=880387 read=487831 dirtied=566 written=223
   ->  HashAggregate  (cost=987146.26..987146.27 rows=1 width=27) (actual time=40052.780..40052.782 rows=2 loops=1)
         Buffers: shared hit=880382 read=487831 dirtied=566 written=223
         ->  Hash Join  (cost=595494.80..982023.82 rows=292711 width=27) (actual time=17308.026..39450.638 rows=311666 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=880382 read=487831 dirtied=566 written=223
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..377381.81 rows=292711 width=15) (actual time=0.153..20928.051 rows=311666 loops=1)
                     Filter: ((l_shipmode = ANY ('{SHIP,FOB}'::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: 6885093
                     Buffers: shared hit=645154 read=467761 dirtied=58 written=221
               ->  Hash  (cost=406494.91..406494.91 rows=15119991 width=20) (actual time=17297.475..17297.475 rows=15015000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 762481kB
                     Buffers: shared hit=235225 read=20070 dirtied=508 written=2
                     ->  Seq Scan on orders  (cost=0.00..406494.91 rows=15119991 width=20) (actual time=0.025..8720.042 rows=15015000 loops=1)
                           Buffers: shared hit=235225 read=20070 dirtied=508 written=2
 Total runtime: 40196.865 ms
(19 rows)

COMMIT;
COMMIT