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 ('TRUCK', '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=992312.98..992312.98 rows=1 width=27) (actual time=34588.417..34588.417 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=610786 read=763058 dirtied=624 written=5263
   ->  HashAggregate  (cost=992312.96..992312.97 rows=1 width=27) (actual time=34588.326..34588.328 rows=2 loops=1)
         Buffers: shared hit=610781 read=763058 dirtied=624 written=5263
         ->  Hash Join  (cost=598445.50..987164.47 rows=294199 width=27) (actual time=14617.453..34057.203 rows=311756 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=610781 read=763058 dirtied=624 written=5263
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..379525.26 rows=294199 width=15) (actual time=0.196..18028.488 rows=311756 loops=1)
                     Filter: ((l_shipmode = ANY ('{TRUCK,RAIL}'::bpchar[])) AND (l_receiptdate >= '1995-01-01'::date) AND (l_receiptdate < '1996-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6884914
                     Buffers: shared hit=362009 read=755267 dirtied=112 written=3715
               ->  Hash  (cost=408509.11..408509.11 rows=15194911 width=20) (actual time=14594.392..14594.392 rows=15015000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 762481kB
                     Buffers: shared hit=248769 read=7791 dirtied=512 written=1548
                     ->  Seq Scan on orders  (cost=0.00..408509.11 rows=15194911 width=20) (actual time=0.026..6452.605 rows=15015000 loops=1)
                           Buffers: shared hit=248769 read=7791 dirtied=512 written=1548
 Total runtime: 34738.607 ms
(19 rows)

COMMIT;
COMMIT