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', 'SHIP')
	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=993566.41..993566.41 rows=1 width=27) (actual time=53241.986..53241.986 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=1152547 read=221697 dirtied=56 written=84
   ->  HashAggregate  (cost=993566.39..993566.40 rows=1 width=27) (actual time=53241.872..53241.873 rows=2 loops=1)
         Buffers: shared hit=1152542 read=221697 dirtied=56 written=84
         ->  Hash Join  (cost=599035.64..988385.32 rows=296061 width=27) (actual time=25857.953..52611.743 rows=311250 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=1152542 read=221697 dirtied=56 written=84
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..380097.78 rows=296061 width=15) (actual time=0.407..25260.556 rows=311250 loops=1)
                     Filter: ((l_shipmode = ANY ('{FOB,SHIP}'::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: 6885439
                     Buffers: shared hit=1009562 read=107861 dirtied=56 written=24
               ->  Hash  (cost=408911.95..408911.95 rows=15209895 width=20) (actual time=25838.980..25838.980 rows=15015000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 762481kB
                     Buffers: shared hit=142977 read=113836 written=60
                     ->  Seq Scan on orders  (cost=0.00..408911.95 rows=15209895 width=20) (actual time=0.029..15019.258 rows=15015000 loops=1)
                           Buffers: shared hit=142977 read=113836 written=60
 Total runtime: 53371.674 ms
(19 rows)

COMMIT;
COMMIT