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 ('AIR', 'RAIL')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1995-01-01'
	and l_receiptdate < date '1995-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                                                           QUERY PLAN                                                                                                                            
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=3038129.27..3038129.28 rows=1 width=27) (actual time=34833.291..34833.292 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=774391 read=552199 dirtied=82 written=2729
   ->  HashAggregate  (cost=3038129.25..3038129.26 rows=1 width=27) (actual time=34833.239..34833.240 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=774386 read=552199 dirtied=82 written=2729
         ->  Hash Join  (cost=594309.84..3033011.99 rows=292415 width=27) (actual time=9766.073..34490.948 rows=311761 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=774386 read=552199 dirtied=82 written=2729
               ->  Seq Scan on lineitem  (cost=0.00..2429564.18 rows=292415 width=15) (actual time=0.090..24392.483 rows=311761 loops=1)
                     Filter: ((l_shipmode = ANY ('{AIR,RAIL}'::bpchar[])) AND (l_commitdate < l_receiptdate) AND (l_shipdate < l_commitdate) AND (l_receiptdate >= '1995-01-01'::date) AND (l_receiptdate < '1996-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 59673926
                     Buffers: shared hit=594222 read=477573 dirtied=1
               ->  Hash  (cost=405686.04..405686.04 rows=15089904 width=20) (actual time=9683.384..9683.384 rows=15000000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 892791kB
                     Buffers: shared hit=180161 read=74626 dirtied=81 written=2729
                     ->  Seq Scan on orders  (cost=0.00..405686.04 rows=15089904 width=20) (actual time=0.011..4821.292 rows=15000000 loops=1)
                           Buffers: shared hit=180161 read=74626 dirtied=81 written=2729
 Planning time: 2.337 ms
 Execution time: 34848.348 ms
(21 rows)

COMMIT;
COMMIT