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 ('REG AIR', 'SHIP')
	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=985915.46..985915.47 rows=1 width=27) (actual time=26980.133..26980.134 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=662722 read=700994 written=2636
   ->  HashAggregate  (cost=985915.44..985915.45 rows=1 width=27) (actual time=26980.079..26980.080 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=662717 read=700994 written=2636
         ->  Hash Join  (cost=594310.27..980761.83 rows=294492 width=27) (actual time=11828.724..26675.102 rows=311379 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=662717 read=700994 written=2636
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..377249.11 rows=294492 width=15) (actual time=0.109..14322.212 rows=311379 loops=1)
                     Filter: ((l_shipmode = ANY ('{"REG AIR",SHIP}'::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: 6885486
                     Buffers: shared hit=467101 read=641820 written=2633
               ->  Hash  (cost=405686.04..405686.04 rows=15089904 width=20) (actual time=11601.011..11601.011 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=195613 read=59174 written=3
                     ->  Seq Scan on orders  (cost=0.00..405686.04 rows=15089904 width=20) (actual time=0.022..5521.398 rows=15015000 loops=1)
                           Buffers: shared hit=195613 read=59174 written=3
 Planning time: 3.097 ms
 Execution time: 26998.279 ms
(21 rows)

COMMIT;
COMMIT