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 '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=992017.42..992017.43 rows=1 width=27) (actual time=86924.433..86924.434 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=900880 read=472964 dirtied=310 written=124
   ->  HashAggregate  (cost=992017.40..992017.41 rows=1 width=27) (actual time=86924.290..86924.292 rows=2 loops=1)
         Buffers: shared hit=900875 read=472964 dirtied=310 written=124
         ->  Hash Join  (cost=598445.50..986867.05 rows=294306 width=27) (actual time=26089.800..86102.595 rows=311521 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=900875 read=472964 dirtied=310 written=124
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..379224.49 rows=294306 width=15) (actual time=1.034..58539.070 rows=311521 loops=1)
                     Filter: ((l_shipmode = ANY ('{MAIL,TRUCK}'::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: 6885149
                     Buffers: shared hit=680959 read=436317 dirtied=57 written=124
               ->  Hash  (cost=408509.11..408509.11 rows=15194911 width=20) (actual time=26077.497..26077.497 rows=15015000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 762481kB
                     Buffers: shared hit=219913 read=36647 dirtied=253
                     ->  Seq Scan on orders  (cost=0.00..408509.11 rows=15194911 width=20) (actual time=0.023..16561.749 rows=15015000 loops=1)
                           Buffers: shared hit=219913 read=36647 dirtied=253
 Total runtime: 87008.866 ms
(19 rows)

COMMIT;
COMMIT