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 ('FOB', 'TRUCK')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1997-01-01'
	and l_receiptdate < date '1997-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                          QUERY PLAN                                                                                           
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=994841.67..994841.68 rows=1 width=27) (actual time=58283.088..58283.089 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=1139723 read=231719 written=35
   ->  HashAggregate  (cost=994841.65..994841.66 rows=1 width=27) (actual time=58282.954..58282.955 rows=2 loops=1)
         Buffers: shared hit=1139718 read=231719 written=35
         ->  Hash Join  (cost=600218.27..989716.53 rows=292864 width=27) (actual time=25354.567..57593.511 rows=311232 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=1139718 read=231719 written=35
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..380346.26 rows=292864 width=15) (actual time=0.257..30704.020 rows=311232 loops=1)
                     Filter: ((l_shipmode = ANY ('{FOB,TRUCK}'::bpchar[])) AND (l_receiptdate >= '1997-01-01'::date) AND (l_receiptdate < '1998-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6885383
                     Buffers: shared hit=919594 read=194520 written=35
               ->  Hash  (cost=409719.23..409719.23 rows=15239923 width=20) (actual time=25344.067..25344.067 rows=15015000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 762481kB
                     Buffers: shared hit=220121 read=37199
                     ->  Seq Scan on orders  (cost=0.00..409719.23 rows=15239923 width=20) (actual time=0.018..16211.219 rows=15015000 loops=1)
                           Buffers: shared hit=220121 read=37199
 Total runtime: 58470.562 ms
(19 rows)

COMMIT;
COMMIT