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Fixed bug mdev-4350.

Browse Source 
Wrong formulas used by the function Histogram::point_selectivity()
could result in a negative value of selectivity returned by the
function.
This commit is contained in:
Igor Babaev
2013-04-03 20:00:10 -07:00
parent 911749ad6f
commit d62ee4e970
4 changed files with 123 additions and 18 deletions
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45
mysql-test/r/selectivity_innodb.result
View File

@@ -484,7 +484,7 @@ order by s_name
limit 10;
s_name s_address
Supplier#000000010 Saygah3gYWMp72i PY
set histogram_size=15;
set histogram_size=127;
ANALYZE TABLE part PERSISTENT FOR COLUMNS(p_name) INDEXES();
Table Op Msg_type Msg_text
dbt3_s001.part analyze status OK
@@ -512,7 +512,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY nation ALL PRIMARY NULL NULL NULL 25 4.00 Using where; Using temporary; Using filesort
1 PRIMARY supplier ref PRIMARY,i_s_nationkey i_s_nationkey 5 dbt3_s001.nation.n_nationkey 1 100.00
1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1 100.00
2 MATERIALIZED part ALL PRIMARY NULL NULL NULL 200 6.25 Using where
2 MATERIALIZED part ALL PRIMARY NULL NULL NULL 200 7.03 Using where
2 MATERIALIZED partsupp ref PRIMARY,i_ps_partkey,i_ps_suppkey PRIMARY 4 dbt3_s001.part.p_partkey 3 100.00 Using where
4 DEPENDENT SUBQUERY lineitem ref i_l_shipdate,i_l_suppkey_partkey,i_l_partkey,i_l_suppkey i_l_suppkey_partkey 10 dbt3_s001.partsupp.ps_partkey,dbt3_s001.partsupp.ps_suppkey 8 14.37 Using where
Warnings:
@@ -540,7 +540,7 @@ limit 10;
s_name s_address
Supplier#000000010 Saygah3gYWMp72i PY
set histogram_type='DOUBLE_PREC_HB';
set histogram_size=30;
set histogram_size=254;
ANALYZE TABLE part PERSISTENT FOR COLUMNS(p_name) INDEXES();
Table Op Msg_type Msg_text
dbt3_s001.part analyze status OK
@@ -567,7 +567,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY nation ALL PRIMARY NULL NULL NULL 25 4.00 Using where; Using temporary; Using filesort
1 PRIMARY supplier ref PRIMARY,i_s_nationkey i_s_nationkey 5 dbt3_s001.nation.n_nationkey 1 100.00
1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1 100.00
2 MATERIALIZED part ALL PRIMARY NULL NULL NULL 200 6.25 Using where
2 MATERIALIZED part ALL PRIMARY NULL NULL NULL 200 7.03 Using where
2 MATERIALIZED partsupp ref PRIMARY,i_ps_partkey,i_ps_suppkey PRIMARY 4 dbt3_s001.part.p_partkey 3 100.00 Using where
4 DEPENDENT SUBQUERY lineitem ref i_l_shipdate,i_l_suppkey_partkey,i_l_partkey,i_l_suppkey i_l_suppkey_partkey 10 dbt3_s001.partsupp.ps_partkey,dbt3_s001.partsupp.ps_suppkey 8 14.37 Using where
Warnings:
@@ -622,7 +622,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY nation ALL PRIMARY NULL NULL NULL 25 4.00 Using where; Using temporary; Using filesort
1 PRIMARY supplier ref PRIMARY,i_s_nationkey i_s_nationkey 5 dbt3_s001.nation.n_nationkey 1 100.00
1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1 100.00
2 MATERIALIZED part ALL PRIMARY NULL NULL NULL 200 6.25 Using where
2 MATERIALIZED part ALL PRIMARY NULL NULL NULL 200 7.03 Using where
2 MATERIALIZED partsupp ref PRIMARY,i_ps_partkey,i_ps_suppkey PRIMARY 4 dbt3_s001.part.p_partkey 3 100.00 Using where
4 DEPENDENT SUBQUERY lineitem ref i_l_shipdate,i_l_suppkey_partkey,i_l_partkey,i_l_suppkey i_l_suppkey_partkey 10 dbt3_s001.partsupp.ps_partkey,dbt3_s001.partsupp.ps_suppkey 8 14.37 Using where
Warnings:
@@ -722,6 +722,41 @@ select * from t1 where a in ( select b from t2 ) AND ( a > 3 );
a
drop table t1,t2;
set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;
#
# Bug mdev-4350: erroneous negative selectivity
#
create table t1 (a int);
insert into t1 values (1), (1);
insert into t1 select * from t1;
insert into t1 select * from t1;
insert into t1 select * from t1;
insert into t1 select * from t1;
insert into t1 select * from t1;
insert into t1 select * from t1;
insert into t1 select * from t1;
insert into t1 select * from t1;
insert into t1 select * from t1;
insert into t1 values (0);
select count(*) from t1;
count(*)
1025
set use_stat_tables='preferably';
set histogram_size=127;
set histogram_type='SINGLE_PREC_HB';
analyze table t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
flush table t1;
set optimizer_use_condition_selectivity=4;
explain extended select * from t1 where a=0;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 1025 49.61 Using where
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a` = 0)
drop table t1;
set histogram_size=@save_histogram_size;
set histogram_type=@save_histogram_type;
set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;
set use_stat_tables=@save_use_stat_tables;
set optimizer_switch=@save_optimizer_switch_for_selectivity_test;
SET SESSION STORAGE_ENGINE=DEFAULT;