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 ('AIR', 'SHIP')
	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=993918.23..993918.24 rows=1 width=27) (actual time=44490.672..44490.672 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=460631 read=913615 dirtied=1191 written=41654
   ->  HashAggregate  (cost=993918.21..993918.22 rows=1 width=27) (actual time=44490.576..44490.577 rows=2 loops=1)
         Buffers: shared hit=460626 read=913615 dirtied=1191 written=41654
         ->  Hash Join  (cost=599035.64..988781.77 rows=293511 width=27) (actual time=19438.567..43893.792 rows=312060 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=460626 read=913615 dirtied=1191 written=41654
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..380573.91 rows=293511 width=15) (actual time=0.168..22944.706 rows=312060 loops=1)
                     Filter: ((l_shipmode = ANY ('{AIR,SHIP}'::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: 6884629
                     Buffers: shared hit=305673 read=811752 dirtied=938 written=41592
               ->  Hash  (cost=408911.95..408911.95 rows=15209895 width=20) (actual time=19426.732..19426.732 rows=15015000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 762481kB
                     Buffers: shared hit=154950 read=101863 dirtied=253 written=62
                     ->  Seq Scan on orders  (cost=0.00..408911.95 rows=15209895 width=20) (actual time=0.013..7931.544 rows=15015000 loops=1)
                           Buffers: shared hit=154950 read=101863 dirtied=253 written=62
 Total runtime: 44707.512 ms
(19 rows)

COMMIT;
COMMIT