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', 'TRUCK')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1996-01-01'
	and l_receiptdate < date '1996-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=981778.97..981778.97 rows=1 width=27) (actual time=46681.906..46681.908 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=1164328 read=197637 dirtied=58 written=7817
   ->  HashAggregate  (cost=981778.95..981778.96 rows=1 width=27) (actual time=46681.783..46681.784 rows=2 loops=1)
         Buffers: shared hit=1164323 read=197637 dirtied=58 written=7817
         ->  Hash Join  (cost=591949.28..976672.78 rows=291781 width=27) (actual time=21509.963..46065.822 rows=313717 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=1164323 read=197637 dirtied=58 written=7817
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..375605.34 rows=291781 width=15) (actual time=0.398..23007.534 rows=313717 loops=1)
                     Filter: ((l_shipmode = ANY ('{"REG AIR",TRUCK}'::bpchar[])) AND (l_receiptdate >= '1996-01-01'::date) AND (l_receiptdate < '1997-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 6883539
                     Buffers: shared hit=910674 read=197508 dirtied=58 written=7817
               ->  Hash  (cost=404074.68..404074.68 rows=15029968 width=20) (actual time=21497.817..21497.817 rows=15015000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 762481kB
                     Buffers: shared hit=253646 read=129
                     ->  Seq Scan on orders  (cost=0.00..404074.68 rows=15029968 width=20) (actual time=0.031..8148.705 rows=15015000 loops=1)
                           Buffers: shared hit=253646 read=129
 Total runtime: 46874.866 ms
(19 rows)

COMMIT;
COMMIT