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 '1996-01-01'
	and l_receiptdate < date '1996-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                                                            QUERY PLAN                                                                                                                             
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=3053236.78..3053236.79 rows=1 width=27) (actual time=33203.942..33203.942 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=1035612 read=297567 dirtied=253 written=857
   ->  HashAggregate  (cost=3053236.76..3053236.77 rows=1 width=27) (actual time=33203.892..33203.893 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=1035607 read=297567 dirtied=253 written=857
         ->  Hash Join  (cost=597265.22..3048087.86 rows=294223 width=27) (actual time=9804.701..32913.138 rows=312559 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=1035607 read=297567 dirtied=253 written=857
               ->  Seq Scan on lineitem  (cost=0.00..2441628.17 rows=294223 width=15) (actual time=0.029..22787.659 rows=312559 loops=1)
                     Filter: ((l_shipmode = ANY ('{RAIL,TRUCK}'::bpchar[])) AND (l_commitdate < l_receiptdate) AND (l_shipdate < l_commitdate) AND (l_receiptdate >= '1996-01-01'::date) AND (l_receiptdate < '1997-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 59732313
                     Buffers: shared hit=936456 read=140661
               ->  Hash  (cost=407703.43..407703.43 rows=15164943 width=20) (actual time=9759.336..9759.336 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=99148 read=156906 dirtied=253 written=857
                     ->  Seq Scan on orders  (cost=0.00..407703.43 rows=15164943 width=20) (actual time=0.011..5321.474 rows=15015000 loops=1)
                           Buffers: shared hit=99148 read=156906 dirtied=253 written=857
 Planning time: 2.369 ms
 Execution time: 33209.898 ms
(21 rows)

COMMIT;
COMMIT