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', 'SHIP')
	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=989116.94..989116.94 rows=1 width=27) (actual time=26481.282..26481.283 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=725083 read=640316 dirtied=56 written=1468
   ->  HashAggregate  (cost=989116.92..989116.93 rows=1 width=27) (actual time=26481.196..26481.197 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=725078 read=640316 dirtied=56 written=1468
         ->  Hash Join  (cost=596675.51..984005.99 rows=292053 width=27) (actual time=12178.939..26178.704 rows=313180 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=725078 read=640316 dirtied=56 written=1468
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.43..378204.26 rows=292053 width=15) (actual time=0.172..13485.549 rows=313180 loops=1)
                     Filter: ((l_shipmode = ANY ('{TRUCK,SHIP}'::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: 6883382
                     Buffers: shared hit=573130 read=536460 dirtied=56 written=1307
               ->  Hash  (cost=407300.59..407300.59 rows=15149959 width=20) (actual time=12060.385..12060.385 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=151945 read=103856 written=161
                     ->  Seq Scan on orders  (cost=0.00..407300.59 rows=15149959 width=20) (actual time=0.020..6018.364 rows=15015000 loops=1)
                           Buffers: shared hit=151945 read=103856 written=161
 Planning time: 3.353 ms
 Execution time: 26491.862 ms
(21 rows)

COMMIT;
COMMIT