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 ('RAIL', '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=985390.35..985390.36 rows=1 width=27) (actual time=34616.068..34616.069 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=456789 read=910624 dirtied=311 written=12
   ->  HashAggregate  (cost=985390.33..985390.34 rows=1 width=27) (actual time=34615.985..34615.985 rows=2 loops=1)
         Buffers: shared hit=456784 read=910624 dirtied=311 written=12
         ->  Hash Join  (cost=594309.84..980299.97 rows=290878 width=27) (actual time=14440.134..34061.950 rows=312020 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=456784 read=910624 dirtied=311 written=12
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..376900.19 rows=290878 width=15) (actual time=0.306..18291.022 rows=312020 loops=1)
                     Filter: ((l_shipmode = ANY ('{RAIL,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: 6884845
                     Buffers: shared hit=205592 read=907026 dirtied=58 written=8
               ->  Hash  (cost=405686.04..405686.04 rows=15089904 width=20) (actual time=14430.433..14430.433 rows=15015000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 762481kB
                     Buffers: shared hit=251189 read=3598 dirtied=253 written=4
                     ->  Seq Scan on orders  (cost=0.00..405686.04 rows=15089904 width=20) (actual time=0.016..6350.998 rows=15015000 loops=1)
                           Buffers: shared hit=251189 read=3598 dirtied=253 written=4
 Total runtime: 34766.569 ms
(19 rows)

COMMIT;
COMMIT