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 ('RAIL', 'REG AIR')
	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=987587.16..987587.17 rows=1 width=27) (actual time=23928.640..23928.641 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=1053342 read=314875 dirtied=58 written=593
   ->  HashAggregate  (cost=987587.14..987587.15 rows=1 width=27) (actual time=23928.577..23928.578 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=1053337 read=314875 dirtied=58 written=593
         ->  Hash Join  (cost=595495.23..982425.16 rows=294970 width=27) (actual time=11691.660..23647.887 rows=312350 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=1053337 read=314875 dirtied=58 written=593
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..377712.55 rows=294970 width=15) (actual time=0.314..11530.460 rows=312350 loops=1)
                     Filter: ((l_shipmode = ANY ('{RAIL,"REG AIR"}'::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: 6884409
                     Buffers: shared hit=821348 read=291566 dirtied=58 written=564
               ->  Hash  (cost=406494.91..406494.91 rows=15119991 width=20) (actual time=11566.548..11566.548 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=231986 read=23309 written=29
                     ->  Seq Scan on orders  (cost=0.00..406494.91 rows=15119991 width=20) (actual time=0.017..5265.330 rows=15015000 loops=1)
                           Buffers: shared hit=231986 read=23309 written=29
 Planning time: 2.985 ms
 Execution time: 23950.529 ms
(21 rows)

COMMIT;
COMMIT