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', 'TRUCK')
	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=990414.95..990414.96 rows=1 width=27) (actual time=32461.966..32461.966 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=726238 read=650513 dirtied=448 written=76
   ->  HashAggregate  (cost=990414.93..990414.94 rows=1 width=27) (actual time=32461.878..32461.880 rows=2 loops=1)
         Buffers: shared hit=726233 read=650513 dirtied=448 written=76
         ->  Hash Join  (cost=597265.22..985253.25 rows=294953 width=27) (actual time=15604.442..31972.404 rows=312559 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=726233 read=650513 dirtied=448 written=76
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..378770.75 rows=294953 width=15) (actual time=0.136..15173.890 rows=312559 loops=1)
                     Filter: ((l_shipmode = ANY ('{RAIL,TRUCK}'::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: 6884023
                     Buffers: shared hit=560214 read=560475 dirtied=168 written=10
               ->  Hash  (cost=407703.43..407703.43 rows=15164943 width=20) (actual time=15593.179..15593.179 rows=15015000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 762481kB
                     Buffers: shared hit=166016 read=90038 dirtied=280 written=66
                     ->  Seq Scan on orders  (cost=0.00..407703.43 rows=15164943 width=20) (actual time=0.018..7487.086 rows=15015000 loops=1)
                           Buffers: shared hit=166016 read=90038 dirtied=280 written=66
 Total runtime: 32589.770 ms
(19 rows)

COMMIT;
COMMIT