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', '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=3056182.14..3056182.15 rows=1 width=27) (actual time=33851.614..33851.614 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=879233 read=455268 written=152
   ->  HashAggregate  (cost=3056182.12..3056182.13 rows=1 width=27) (actual time=33851.559..33851.559 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=879228 read=455268 written=152
         ->  Hash Join  (cost=597855.36..3051057.63 rows=292828 width=27) (actual time=9606.073..33525.625 rows=312624 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=879228 read=455268 written=152
               ->  Seq Scan on lineitem  (cost=0.00..2444051.40 rows=292828 width=15) (actual time=0.177..23597.391 rows=312624 loops=1)
                     Filter: ((l_shipmode = ANY ('{MAIL,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: 59732370
                     Buffers: shared hit=667144 read=411042 written=2
               ->  Hash  (cost=408106.27..408106.27 rows=15179927 width=20) (actual time=9532.219..9532.219 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=212081 read=44226 written=150
                     ->  Seq Scan on orders  (cost=0.00..408106.27 rows=15179927 width=20) (actual time=0.014..4406.173 rows=15015000 loops=1)
                           Buffers: shared hit=212081 read=44226 written=150
 Planning time: 3.062 ms
 Execution time: 33856.320 ms
(21 rows)

COMMIT;
COMMIT