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', 'AIR')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1994-01-01'
	and l_receiptdate < date '1994-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                            QUERY PLAN                                                                                             
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=986705.33..986705.34 rows=1 width=27) (actual time=35440.381..35440.381 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=480796 read=887168 dirtied=243 written=8585
   ->  HashAggregate  (cost=986705.31..986705.32 rows=1 width=27) (actual time=35440.283..35440.286 rows=2 loops=1)
         Buffers: shared hit=480791 read=887168 dirtied=243 written=8585
         ->  Hash Join  (cost=594902.33..981598.43 rows=291822 width=27) (actual time=16288.434..34940.167 rows=311533 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=480791 read=887168 dirtied=243 written=8585
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..377576.66 rows=291822 width=15) (actual time=0.136..17420.899 rows=311533 loops=1)
                     Filter: ((l_shipmode = ANY ('{"REG AIR",AIR}'::bpchar[])) AND (l_receiptdate >= '1994-01-01'::date) AND (l_receiptdate < '1995-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6878146
                     Buffers: shared hit=359014 read=753901 dirtied=58 written=1318
               ->  Hash  (cost=406090.48..406090.48 rows=15104948 width=20) (actual time=16280.772..16280.772 rows=15000000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 761719kB
                     Buffers: shared hit=121774 read=133267 dirtied=185 written=7267
                     ->  Seq Scan on orders  (cost=0.00..406090.48 rows=15104948 width=20) (actual time=0.012..7924.606 rows=15000000 loops=1)
                           Buffers: shared hit=121774 read=133267 dirtied=185 written=7267
 Total runtime: 35573.323 ms
(19 rows)

COMMIT;
COMMIT