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 ('SHIP', 'TRUCK')
	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=982174.73..982174.73 rows=1 width=27) (actual time=26812.235..26812.236 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=873264 read=485651 dirtied=1032 written=7977
   ->  HashAggregate  (cost=982174.71..982174.72 rows=1 width=27) (actual time=26812.170..26812.171 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=873259 read=485651 dirtied=1032 written=7977
         ->  Hash Join  (cost=592539.85..977133.04 rows=288095 width=27) (actual time=11341.762..26457.741 rows=311442 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=873259 read=485651 dirtied=1032 written=7977
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..375590.66 rows=288095 width=15) (actual time=0.127..14589.922 rows=311442 loops=1)
                     Filter: ((l_shipmode = ANY ('{SHIP,TRUCK}'::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: 6885809
                     Buffers: shared hit=670915 read=433964 dirtied=1032 written=7977
               ->  Hash  (cost=404477.52..404477.52 rows=15044952 width=20) (actual time=11213.068..11213.068 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=202341 read=51687
                     ->  Seq Scan on orders  (cost=0.00..404477.52 rows=15044952 width=20) (actual time=0.022..5474.740 rows=15015000 loops=1)
                           Buffers: shared hit=202341 read=51687
 Planning time: 3.018 ms
 Execution time: 26848.375 ms
(21 rows)

COMMIT;
COMMIT