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 ('AIR', '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=984780.97..984780.97 rows=1 width=27) (actual time=40582.089..40582.089 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=671375 read=699419 dirtied=390 written=3772
   ->  HashAggregate  (cost=984780.95..984780.96 rows=1 width=27) (actual time=40581.965..40581.968 rows=2 loops=1)
         Buffers: shared hit=671370 read=699419 dirtied=390 written=3772
         ->  Hash Join  (cost=593719.70..979690.14 rows=290903 width=27) (actual time=18251.586..39994.133 rows=311769 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=671370 read=699419 dirtied=390 written=3772
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..376879.72 rows=290903 width=15) (actual time=0.467..20438.645 rows=311769 loops=1)
                     Filter: ((l_shipmode = ANY ('{AIR,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: 6878096
                     Buffers: shared hit=450614 read=665638 dirtied=117 written=1357
               ->  Hash  (cost=405283.20..405283.20 rows=15074920 width=20) (actual time=18242.696..18242.696 rows=15000000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 761719kB
                     Buffers: shared hit=220753 read=33781 dirtied=273 written=2415
                     ->  Seq Scan on orders  (cost=0.00..405283.20 rows=15074920 width=20) (actual time=0.022..8794.836 rows=15000000 loops=1)
                           Buffers: shared hit=220753 read=33781 dirtied=273 written=2415
 Total runtime: 40745.773 ms
(19 rows)

COMMIT;
COMMIT