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 ('FOB', 'REG AIR')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1993-01-01'
	and l_receiptdate < date '1993-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                            QUERY PLAN                                                                                             
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=993662.22..993662.23 rows=1 width=27) (actual time=44974.304..44974.305 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=538509 read=832262 dirtied=1178 written=51305
   ->  HashAggregate  (cost=993662.20..993662.21 rows=1 width=27) (actual time=44974.180..44974.181 rows=2 loops=1)
         Buffers: shared hit=538504 read=832262 dirtied=1178 written=51305
         ->  Hash Join  (cost=599035.64..988502.00 rows=294869 width=27) (actual time=18067.396..44362.195 rows=312758 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=538504 read=832262 dirtied=1178 written=51305
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..380251.70 rows=294869 width=15) (actual time=3.164..24898.498 rows=312758 loops=1)
                     Filter: ((l_shipmode = ANY ('{FOB,"REG AIR"}'::bpchar[])) AND (l_receiptdate >= '1993-01-01'::date) AND (l_receiptdate < '1994-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6883931
                     Buffers: shared hit=281688 read=832262 dirtied=1178 written=51305
               ->  Hash  (cost=408911.95..408911.95 rows=15209895 width=20) (actual time=18046.541..18046.541 rows=15015000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 762481kB
                     Buffers: shared hit=256813
                     ->  Seq Scan on orders  (cost=0.00..408911.95 rows=15209895 width=20) (actual time=0.032..7628.540 rows=15015000 loops=1)
                           Buffers: shared hit=256813
 Total runtime: 45148.195 ms
(19 rows)

COMMIT;
COMMIT