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 ('MAIL', 'REG AIR')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1994-01-01'
	and l_receiptdate < date '1994-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                             QUERY PLAN                                                                                             
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=982594.89..982594.89 rows=1 width=27) (actual time=65757.032..65757.033 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=761026 read=599100 written=18702
   ->  HashAggregate  (cost=982594.87..982594.88 rows=1 width=27) (actual time=65756.932..65756.934 rows=2 loops=1)
         Buffers: shared hit=761021 read=599100 written=18702
         ->  Hash Join  (cost=592539.42..977541.44 rows=288767 width=27) (actual time=21650.517..65009.978 rows=310962 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=761021 read=599100 written=18702
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..375978.06 rows=288767 width=15) (actual time=0.223..41678.218 rows=310962 loops=1)
                     Filter: ((l_shipmode = ANY ('{MAIL,"REG AIR"}'::bpchar[])) AND (l_receiptdate >= '1994-01-01'::date) AND (l_receiptdate < '1995-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6886289
                     Buffers: shared hit=525459 read=580631 written=18702
               ->  Hash  (cost=404477.52..404477.52 rows=15044952 width=20) (actual time=21638.920..21638.920 rows=15015000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 762481kB
                     Buffers: shared hit=235559 read=18469
                     ->  Seq Scan on orders  (cost=0.00..404477.52 rows=15044952 width=20) (actual time=0.019..11510.668 rows=15015000 loops=1)
                           Buffers: shared hit=235559 read=18469
 Total runtime: 65941.794 ms
(19 rows)

COMMIT;
COMMIT