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 ('AIR', '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=991625.95..991625.95 rows=1 width=27) (actual time=33690.836..33690.837 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=659172 read=710614 dirtied=310 written=93
   ->  HashAggregate  (cost=991625.93..991625.94 rows=1 width=27) (actual time=33690.720..33690.721 rows=2 loops=1)
         Buffers: shared hit=659167 read=710614 dirtied=310 written=93
         ->  Hash Join  (cost=597855.36..986512.22 rows=292212 width=27) (actual time=14421.282..33182.680 rows=312863 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=659167 read=710614 dirtied=310 written=93
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..379525.24 rows=292212 width=15) (actual time=0.385..17588.054 rows=312863 loops=1)
                     Filter: ((l_shipmode = ANY ('{AIR,"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: 6883663
                     Buffers: shared hit=406319 read=707152 dirtied=57 written=92
               ->  Hash  (cost=408106.27..408106.27 rows=15179927 width=20) (actual time=14406.219..14406.219 rows=15015000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 762481kB
                     Buffers: shared hit=252845 read=3462 dirtied=253 written=1
                     ->  Seq Scan on orders  (cost=0.00..408106.27 rows=15179927 width=20) (actual time=0.029..6804.546 rows=15015000 loops=1)
                           Buffers: shared hit=252845 read=3462 dirtied=253 written=1
 Total runtime: 33786.360 ms
(19 rows)

COMMIT;
COMMIT