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', 'FOB')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1997-01-01'
	and l_receiptdate < date '1997-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                          QUERY PLAN                                                                                          
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=981940.62..981940.62 rows=1 width=27) (actual time=22107.458..22107.458 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=938231 read=424390 dirtied=311 written=49
   ->  HashAggregate  (cost=981940.60..981940.61 rows=1 width=27) (actual time=22107.403..22107.404 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=938226 read=424390 dirtied=311 written=49
         ->  Hash Join  (cost=592539.85..976858.09 rows=290429 width=27) (actual time=11302.759..21824.029 rows=311544 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=938226 read=424390 dirtied=311 written=49
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..375242.77 rows=290429 width=15) (actual time=0.279..10197.035 rows=311544 loops=1)
                     Filter: ((l_shipmode = ANY ('{RAIL,FOB}'::bpchar[])) AND (l_receiptdate >= '1997-01-01'::date) AND (l_receiptdate < '1998-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6885707
                     Buffers: shared hit=744682 read=363903 dirtied=58 written=49
               ->  Hash  (cost=404477.52..404477.52 rows=15044952 width=20) (actual time=11172.697..11172.697 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=193541 read=60487 dirtied=253
                     ->  Seq Scan on orders  (cost=0.00..404477.52 rows=15044952 width=20) (actual time=0.019..5199.564 rows=15015000 loops=1)
                           Buffers: shared hit=193541 read=60487 dirtied=253
 Planning time: 2.709 ms
 Execution time: 22113.315 ms
(21 rows)

COMMIT;
COMMIT