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', 'REG AIR')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1995-01-01'
	and l_receiptdate < date '1995-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                             QUERY PLAN                                                                                             
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=991947.13..991947.13 rows=1 width=27) (actual time=36286.143..36286.143 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=829977 read=539809 dirtied=57 written=90
   ->  HashAggregate  (cost=991947.11..991947.12 rows=1 width=27) (actual time=36286.024..36286.025 rows=2 loops=1)
         Buffers: shared hit=829972 read=539809 dirtied=57 written=90
         ->  Hash Join  (cost=597855.36..986826.17 rows=292625 width=27) (actual time=15236.826..35722.255 rows=312083 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=829972 read=539809 dirtied=57 written=90
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..379826.28 rows=292625 width=15) (actual time=0.329..19125.859 rows=312083 loops=1)
                     Filter: ((l_shipmode = ANY ('{SHIP,"REG AIR"}'::bpchar[])) AND (l_receiptdate >= '1995-01-01'::date) AND (l_receiptdate < '1996-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6884443
                     Buffers: shared hit=573761 read=539710 dirtied=57 written=90
               ->  Hash  (cost=408106.27..408106.27 rows=15179927 width=20) (actual time=15221.156..15221.156 rows=15015000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 762481kB
                     Buffers: shared hit=256208 read=99
                     ->  Seq Scan on orders  (cost=0.00..408106.27 rows=15179927 width=20) (actual time=0.023..7115.285 rows=15015000 loops=1)
                           Buffers: shared hit=256208 read=99
 Total runtime: 36445.150 ms
(19 rows)

COMMIT;
COMMIT