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 ('SHIP', 'AIR')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1993-01-01'
	and l_receiptdate < date '1993-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                          QUERY PLAN                                                                                          
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=984277.06..984277.07 rows=1 width=27) (actual time=88766.777..88766.777 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=900270 read=466764 written=37
   ->  HashAggregate  (cost=984277.04..984277.05 rows=1 width=27) (actual time=88766.644..88766.646 rows=2 loops=1)
         Buffers: shared hit=900265 read=466764 written=37
         ->  Hash Join  (cost=593719.70..979134.75 rows=293845 width=27) (actual time=24511.820..87946.152 rows=313295 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=900265 read=466764 written=37
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..376232.40 rows=293845 width=15) (actual time=0.287..61705.132 rows=313295 loops=1)
                     Filter: ((l_shipmode = ANY ('{SHIP,AIR}'::bpchar[])) AND (l_receiptdate >= '1993-01-01'::date) AND (l_receiptdate < '1994-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6883907
                     Buffers: shared hit=650097 read=462395 written=36
               ->  Hash  (cost=405283.20..405283.20 rows=15074920 width=20) (actual time=24489.037..24489.037 rows=15015000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 762481kB
                     Buffers: shared hit=250165 read=4369 written=1
                     ->  Seq Scan on orders  (cost=0.00..405283.20 rows=15074920 width=20) (actual time=0.017..14140.463 rows=15015000 loops=1)
                           Buffers: shared hit=250165 read=4369 written=1
 Total runtime: 88955.280 ms
(19 rows)

COMMIT;
COMMIT