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 ('REG AIR', 'SHIP')
	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=990914.90..990914.91 rows=1 width=27) (actual time=26618.314..26618.315 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=799240 read=570545 dirtied=57 written=663
   ->  HashAggregate  (cost=990914.88..990914.89 rows=1 width=27) (actual time=26618.227..26618.228 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=799235 read=570545 dirtied=57 written=663
         ->  Hash Join  (cost=597855.79..985786.68 rows=293040 width=27) (actual time=11984.466..26268.333 rows=312083 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=799235 read=570545 dirtied=57 written=663
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..378773.82 rows=293040 width=15) (actual time=0.193..13941.127 rows=312083 loops=1)
                     Filter: ((l_shipmode = ANY ('{"REG AIR",SHIP}'::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=596494 read=516976 dirtied=57 written=612
               ->  Hash  (cost=408106.27..408106.27 rows=15179927 width=20) (actual time=11835.855..11835.855 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=202738 read=53569 written=51
                     ->  Seq Scan on orders  (cost=0.00..408106.27 rows=15179927 width=20) (actual time=0.025..5951.663 rows=15015000 loops=1)
                           Buffers: shared hit=202738 read=53569 written=51
 Planning time: 5.039 ms
 Execution time: 26637.605 ms
(21 rows)

COMMIT;
COMMIT