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 ('TRUCK', '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=989167.93..989167.94 rows=1 width=27) (actual time=23880.863..23880.864 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=914664 read=454384 dirtied=1076 written=633
   ->  HashAggregate  (cost=989167.91..989167.92 rows=1 width=27) (actual time=23880.798..23880.800 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=914659 read=454384 dirtied=1076 written=633
         ->  Hash Join  (cost=596675.51..984038.68 rows=293099 width=27) (actual time=10643.380..23571.299 rows=312652 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=914659 read=454384 dirtied=1076 written=633
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..378204.26 rows=293099 width=15) (actual time=0.087..12415.691 rows=312652 loops=1)
                     Filter: ((l_shipmode = ANY ('{TRUCK,"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: 6883910
                     Buffers: shared hit=693019 read=420220 dirtied=853 written=591
               ->  Hash  (cost=407300.59..407300.59 rows=15149959 width=20) (actual time=10548.453..10548.453 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=221637 read=34164 dirtied=223 written=42
                     ->  Seq Scan on orders  (cost=0.00..407300.59 rows=15149959 width=20) (actual time=0.022..5106.478 rows=15015000 loops=1)
                           Buffers: shared hit=221637 read=34164 dirtied=223 written=42
 Planning time: 3.070 ms
 Execution time: 23892.227 ms
(21 rows)

COMMIT;
COMMIT