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 ('REG AIR', 'AIR')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1997-01-01'
	and l_receiptdate < date '1997-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                            QUERY PLAN                                                                                             
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=984854.78..984854.79 rows=1 width=27) (actual time=34542.190..34542.191 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=764905 read=602255 dirtied=1808 written=2504
   ->  HashAggregate  (cost=984854.76..984854.77 rows=1 width=27) (actual time=34541.986..34541.987 rows=2 loops=1)
         Buffers: shared hit=764900 read=602255 dirtied=1808 written=2504
         ->  Hash Join  (cost=593719.70..979773.66 rows=290349 width=27) (actual time=15618.965..34018.381 rows=310715 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=764900 read=602255 dirtied=1808 written=2504
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..376980.55 rows=290349 width=15) (actual time=0.300..17047.886 rows=310715 loops=1)
                     Filter: ((l_shipmode = ANY ('{"REG AIR",AIR}'::bpchar[])) AND (l_receiptdate >= '1997-01-01'::date) AND (l_receiptdate < '1998-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6879150
                     Buffers: shared hit=529957 read=582661 dirtied=1516 written=824
               ->  Hash  (cost=405283.20..405283.20 rows=15074920 width=20) (actual time=15608.876..15608.876 rows=15000000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 761719kB
                     Buffers: shared hit=234940 read=19594 dirtied=292 written=1680
                     ->  Seq Scan on orders  (cost=0.00..405283.20 rows=15074920 width=20) (actual time=0.027..7175.148 rows=15000000 loops=1)
                           Buffers: shared hit=234940 read=19594 dirtied=292 written=1680
 Total runtime: 34698.152 ms
(19 rows)

COMMIT;
COMMIT