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 ('TRUCK', 'FOB')
	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=990004.24..990004.25 rows=1 width=27) (actual time=38109.824..38109.824 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=987912 read=381280 dirtied=1132 written=319
   ->  HashAggregate  (cost=990004.22..990004.23 rows=1 width=27) (actual time=38109.671..38109.672 rows=2 loops=1)
         Buffers: shared hit=987907 read=381280 dirtied=1132 written=319
         ->  Hash Join  (cost=596675.08..984898.25 rows=291770 width=27) (actual time=15359.698..37471.082 rows=312150 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=987907 read=381280 dirtied=1132 written=319
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..379105.36 rows=291770 width=15) (actual time=0.191..20832.543 rows=312150 loops=1)
                     Filter: ((l_shipmode = ANY ('{TRUCK,FOB}'::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: 6877220
                     Buffers: shared hit=738658 read=374725 dirtied=1131 written=293
               ->  Hash  (cost=407300.59..407300.59 rows=15149959 width=20) (actual time=15349.141..15349.141 rows=15000000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 761719kB
                     Buffers: shared hit=249246 read=6555 dirtied=1 written=26
                     ->  Seq Scan on orders  (cost=0.00..407300.59 rows=15149959 width=20) (actual time=0.020..7786.303 rows=15000000 loops=1)
                           Buffers: shared hit=249246 read=6555 dirtied=1 written=26
 Total runtime: 38234.878 ms
(19 rows)

COMMIT;
COMMIT