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 ('SHIP', 'AIR')
	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=985775.58..985775.59 rows=1 width=27) (actual time=36373.820..36373.821 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=663369 read=700348 dirtied=1068 written=49432
   ->  HashAggregate  (cost=985775.56..985775.57 rows=1 width=27) (actual time=36373.731..36373.732 rows=2 loops=1)
         Buffers: shared hit=663364 read=700348 dirtied=1068 written=49432
         ->  Hash Join  (cost=594309.84..980681.79 rows=291073 width=27) (actual time=14968.180..35794.149 rows=311550 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=663364 read=700348 dirtied=1068 written=49432
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..377275.92 rows=291073 width=15) (actual time=0.201..19434.438 rows=311550 loops=1)
                     Filter: ((l_shipmode = ANY ('{SHIP,AIR}'::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: 6885315
                     Buffers: shared hit=408574 read=700348 dirtied=1068 written=49432
               ->  Hash  (cost=405686.04..405686.04 rows=15089904 width=20) (actual time=14958.089..14958.089 rows=15015000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 762481kB
                     Buffers: shared hit=254787
                     ->  Seq Scan on orders  (cost=0.00..405686.04 rows=15089904 width=20) (actual time=0.018..6749.206 rows=15015000 loops=1)
                           Buffers: shared hit=254787
 Total runtime: 36501.863 ms
(19 rows)

COMMIT;
COMMIT