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 '1996-01-01'
	and l_receiptdate < date '1996-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                          QUERY PLAN                                                                                          
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=990442.59..990442.60 rows=1 width=27) (actual time=33592.197..33592.198 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=578282 read=791251 dirtied=18 written=53523
   ->  HashAggregate  (cost=990442.57..990442.58 rows=1 width=27) (actual time=33592.095..33592.097 rows=2 loops=1)
         Buffers: shared hit=578277 read=791251 dirtied=18 written=53523
         ->  Hash Join  (cost=597265.22..985270.97 rows=295520 width=27) (actual time=12922.454..33048.210 rows=312128 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=578277 read=791251 dirtied=18 written=53523
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..378770.75 rows=295520 width=15) (actual time=0.124..18803.277 rows=312128 loops=1)
                     Filter: ((l_shipmode = ANY ('{FOB,RAIL}'::bpchar[])) AND (l_receiptdate >= '1996-01-01'::date) AND (l_receiptdate < '1997-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6877291
                     Buffers: shared hit=330862 read=782609 written=53523
               ->  Hash  (cost=407703.43..407703.43 rows=15164943 width=20) (actual time=12913.334..12913.334 rows=15000000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 761719kB
                     Buffers: shared hit=247412 read=8642 dirtied=18
                     ->  Seq Scan on orders  (cost=0.00..407703.43 rows=15164943 width=20) (actual time=0.022..6124.079 rows=15000000 loops=1)
                           Buffers: shared hit=247412 read=8642 dirtied=18
 Total runtime: 33775.909 ms
(19 rows)

COMMIT;
COMMIT