1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
SET SESSION STORAGE_ENGINE='InnoDB';
select @@global.use_stat_tables;
@@global.use_stat_tables
PREFERABLY
select @@session.use_stat_tables;
@@session.use_stat_tables
PREFERABLY
set @save_use_stat_tables=@@use_stat_tables;
set use_stat_tables='preferably';
DROP DATABASE IF EXISTS dbt3_s001;
CREATE DATABASE dbt3_s001;
use dbt3_s001;
set @save_optimizer_switch=@@optimizer_switch;
set optimizer_switch='extended_keys=off';
#
# Bug mdev-503: optimizer ignores setting use_stat_tables='preferably'
#
flush tables
customer, lineitem, nation, orders, part, partsupp, region, supplier;
set use_stat_tables='never';
EXPLAIN select sql_calc_found_rows straight_join
l_orderkey, sum(l_extendedprice*(1-l_discount)) as revenue,
o_orderdate, o_shippriority
from orders, customer, lineitem
where c_mktsegment = 'BUILDING' and c_custkey = o_custkey
and l_orderkey = o_orderkey and o_orderdate < date '1995-03-15'
and l_shipdate > date '1995-03-15'
group by l_orderkey, o_orderdate, o_shippriority
order by revenue desc, o_orderdate
limit 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE orders ALL PRIMARY,i_o_orderdate,i_o_custkey NULL NULL NULL # Using where; Using temporary; Using filesort
1 SIMPLE customer eq_ref PRIMARY PRIMARY 4 dbt3_s001.orders.o_custkey # Using where
1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 dbt3_s001.orders.o_orderkey # Using where
set use_stat_tables='preferably';
EXPLAIN select sql_calc_found_rows straight_join
l_orderkey, sum(l_extendedprice*(1-l_discount)) as revenue,
o_orderdate, o_shippriority
from orders, customer, lineitem
where c_mktsegment = 'BUILDING' and c_custkey = o_custkey
and l_orderkey = o_orderkey and o_orderdate < date '1995-03-15'
and l_shipdate > date '1995-03-15'
group by l_orderkey, o_orderdate, o_shippriority
order by revenue desc, o_orderdate
limit 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE orders ALL PRIMARY,i_o_orderdate,i_o_custkey NULL NULL NULL 1500 Using where; Using temporary; Using filesort
1 SIMPLE customer eq_ref PRIMARY PRIMARY 4 dbt3_s001.orders.o_custkey 1 Using where
1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 dbt3_s001.orders.o_orderkey 4 Using where
flush tables customer, orders, lineitem;
EXPLAIN select sql_calc_found_rows straight_join
l_orderkey, sum(l_extendedprice*(1-l_discount)) as revenue,
o_orderdate, o_shippriority
from orders, customer, lineitem
where c_mktsegment = 'BUILDING' and c_custkey = o_custkey
and l_orderkey = o_orderkey and o_orderdate < date '1995-03-15'
and l_shipdate > date '1995-03-15'
group by l_orderkey, o_orderdate, o_shippriority
order by revenue desc, o_orderdate
limit 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE orders ALL PRIMARY,i_o_orderdate,i_o_custkey NULL NULL NULL 1500 Using where; Using temporary; Using filesort
1 SIMPLE customer eq_ref PRIMARY PRIMARY 4 dbt3_s001.orders.o_custkey 1 Using where
1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 dbt3_s001.orders.o_orderkey 4 Using where
# End of the test case for mdev-503
set optimizer_switch=@save_optimizer_switch;
DROP DATABASE dbt3_s001;
use test;
set use_stat_tables=@save_use_stat_tables;
SET SESSION STORAGE_ENGINE=DEFAULT;
|
