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 ('RAIL', 'TRUCK')
	and l_commitdate < l_receiptdate
	and l_shipdate < l_commitdate
	and l_receiptdate >= date '1994-01-01'
	and l_receiptdate < date '1994-01-01' + interval '1 year'
group by
	l_shipmode
order by
	l_shipmode;
                                                                                                                            QUERY PLAN                                                                                                                             
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=3022883.53..3022883.54 rows=1 width=27) (actual time=35817.031..35817.031 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=718513 read=601490
   ->  HashAggregate  (cost=3022883.51..3022883.52 rows=1 width=27) (actual time=35816.974..35816.974 rows=2 loops=1)
         Group Key: lineitem.l_shipmode
         Buffers: shared hit=718508 read=601490
         ->  Hash Join  (cost=591359.14..3017849.18 rows=287676 width=27) (actual time=10467.821..35507.162 rows=311650 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=718508 read=601490
               ->  Seq Scan on lineitem  (cost=0.00..2417500.17 rows=287676 width=15) (actual time=0.059..24633.497 rows=311650 loops=1)
                     Filter: ((l_shipmode = ANY ('{RAIL,TRUCK}'::bpchar[])) AND (l_commitdate < l_receiptdate) AND (l_shipdate < l_commitdate) AND (l_receiptdate >= '1994-01-01'::date) AND (l_receiptdate < '1995-01-01 00:00:00'::timestamp without time zone))
                     Rows Removed by Filter: 59734019
                     Buffers: shared hit=594203 read=472270
               ->  Hash  (cost=403671.84..403671.84 rows=15014984 width=20) (actual time=10399.086..10399.086 rows=15015000 loops=1)
                     Buckets: 16777216  Batches: 1  Memory Usage: 893553kB
                     Buffers: shared hit=124302 read=129220
                     ->  Seq Scan on orders  (cost=0.00..403671.84 rows=15014984 width=20) (actual time=0.007..4849.495 rows=15015000 loops=1)
                           Buffers: shared hit=124302 read=129220
 Planning time: 1.991 ms
 Execution time: 35821.340 ms
(21 rows)

COMMIT;
COMMIT