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', '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=989533.47..989533.47 rows=1 width=27) (actual time=24548.242..24548.243 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=939932 read=425467 dirtied=554 written=7804
   ->  HashAggregate  (cost=989533.45..989533.46 rows=1 width=27) (actual time=24548.178..24548.178 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=939927 read=425467 dirtied=554 written=7804
         ->  Hash Join  (cost=596675.51..984466.72 rows=289527 width=27) (actual time=11211.224..24243.502 rows=311716 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=939927 read=425467 dirtied=554 written=7804
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..378743.93 rows=289527 width=15) (actual time=0.127..12524.257 rows=311716 loops=1)
                     Filter: ((l_shipmode = ANY ('{RAIL,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: 6884846
                     Buffers: shared hit=737131 read=372459 dirtied=554 written=7657
               ->  Hash  (cost=407300.59..407300.59 rows=15149959 width=20) (actual time=10877.612..10877.612 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=202793 read=53008 written=147
                     ->  Seq Scan on orders  (cost=0.00..407300.59 rows=15149959 width=20) (actual time=0.025..5663.888 rows=15015000 loops=1)
                           Buffers: shared hit=202793 read=53008 written=147
 Planning time: 3.316 ms
 Execution time: 24572.093 ms
(21 rows)

COMMIT;
COMMIT