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', 'SHIP')
	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=989175.77..989175.77 rows=1 width=27) (actual time=46247.899..46247.900 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=919691 read=445816 dirtied=1189 written=5777
   ->  HashAggregate  (cost=989175.75..989175.76 rows=1 width=27) (actual time=46247.754..46247.755 rows=2 loops=1)
         Buffers: shared hit=919686 read=445816 dirtied=1189 written=5777
         ->  Hash Join  (cost=596675.08..984064.64 rows=292063 width=27) (actual time=19419.291..45607.497 rows=311791 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=919686 read=445816 dirtied=1189 written=5777
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..378262.60 rows=292063 width=15) (actual time=0.297..24746.508 rows=311791 loops=1)
                     Filter: ((l_shipmode = ANY ('{"REG AIR",SHIP}'::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: 6877579
                     Buffers: shared hit=741326 read=368372 dirtied=1074 written=256
               ->  Hash  (cost=407300.59..407300.59 rows=15149959 width=20) (actual time=19406.140..19406.140 rows=15000000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 761719kB
                     Buffers: shared hit=178357 read=77444 dirtied=115 written=5521
                     ->  Seq Scan on orders  (cost=0.00..407300.59 rows=15149959 width=20) (actual time=0.019..10209.751 rows=15000000 loops=1)
                           Buffers: shared hit=178357 read=77444 dirtied=115 written=5521
 Total runtime: 46451.725 ms
(19 rows)

COMMIT;
COMMIT