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', 'FOB')
	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=982242.43..982242.44 rows=1 width=27) (actual time=53075.460..53075.460 rows=2 loops=1)
   Sort Key: lineitem.l_shipmode
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=891527 read=474890 dirtied=1085 written=2234
   ->  HashAggregate  (cost=982242.41..982242.42 rows=1 width=27) (actual time=53075.348..53075.349 rows=2 loops=1)
         Buffers: shared hit=891522 read=474890 dirtied=1085 written=2234
         ->  Hash Join  (cost=592539.42..977152.73 rows=290839 width=27) (actual time=18718.402..52358.045 rows=312353 loops=1)
               Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
               Buffers: shared hit=891522 read=474890 dirtied=1085 written=2234
               ->  Index Scan using lineitem_l_orderkey_idx_part2 on lineitem  (cost=0.00..375524.59 rows=290839 width=15) (actual time=0.281..31863.235 rows=312353 loops=1)
                     Filter: ((l_shipmode = ANY ('{"REG AIR",FOB}'::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: 6877709
                     Buffers: shared hit=639082 read=473299 dirtied=1082 written=2158
               ->  Hash  (cost=404477.52..404477.52 rows=15044952 width=20) (actual time=18703.706..18703.706 rows=15000000 loops=1)
                     Buckets: 2097152  Batches: 1  Memory Usage: 761719kB
                     Buffers: shared hit=252437 read=1591 dirtied=3 written=76
                     ->  Seq Scan on orders  (cost=0.00..404477.52 rows=15044952 width=20) (actual time=0.030..9251.518 rows=15000000 loops=1)
                           Buffers: shared hit=252437 read=1591 dirtied=3 written=76
 Total runtime: 53272.933 ms
(19 rows)

COMMIT;
COMMIT