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', 'RAIL')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1995-01-01'
	and l_receiptdate < date '1995-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                          QUERY PLAN                                                                                          
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=985515.65..985515.65 rows=1 width=27) (actual time=49994.582..49994.582 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=616484 read=750929 dirtied=87 written=13929
   ->  HashAggregate  (cost=985515.63..985515.64 rows=1 width=27) (actual time=49994.435..49994.435 rows=2 loops=1)
         Buffers: shared hit=616479 read=750929 dirtied=87 written=13929
         ->  Hash Join  (cost=594309.84..980452.32 rows=289332 width=27) (actual time=19226.628..49300.444 rows=312019 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=616479 read=750929 dirtied=87 written=13929
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..377100.85 rows=289332 width=15) (actual time=3.482..28618.146 rows=312019 loops=1)
                     Filter: ((l_shipmode = ANY ('{FOB,RAIL}'::bpchar[])) AND (l_receiptdate >= '1995-01-01'::date) AND (l_receiptdate < '1996-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6884846
                     Buffers: shared hit=371366 read=741252 dirtied=87 written=13929
               ->  Hash  (cost=405686.04..405686.04 rows=15089904 width=20) (actual time=19212.535..19212.535 rows=15015000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 762481kB
                     Buffers: shared hit=245110 read=9677
                     ->  Seq Scan on orders  (cost=0.00..405686.04 rows=15089904 width=20) (actual time=0.021..8538.174 rows=15015000 loops=1)
                           Buffers: shared hit=245110 read=9677
 Total runtime: 50127.799 ms
(19 rows)

COMMIT;
COMMIT