Details
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Bug
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Status: Closed (View Workflow)
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Minor
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Resolution: Fixed
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5.5.25, 5.3.7
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None
Description
https://bugs.launchpad.net/maria/+bug/1010116
Test case 1 (with default optimizer_switch):
SELECT
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`Derived1`.`id`,
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`Derived2`.`Val1`
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FROM (select 30631 as `id`) AS `Derived1` LEFT OUTER JOIN (SELECT
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2 as `id`,
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1 AS `Val1`
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FROM (select 30631 as `id`) AS `Derived3`) AS `Derived2` ON `Derived1`.`id` = `Derived2`.`id`;
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Expected result:
id Val1
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30631 NULL
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Actual result:
id Val1
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30631 1
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Reproducible on maria/5.3 revno 3562, maria/5.5 revno 3508
Not reproducible on mysql/5.1 revno 3770, mysql/5.5 revno 3900, mysql/5.6 revno 3917, maria/5.2 revno 3168
Test case 2
create table t1 ( id int );
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insert into t1 values (30631);
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create table t2 ( id int );
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insert into t2 values (30631);
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create algorithm=MERGE view v2 as select 2 as id, 1 as val1 from t2;
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select t1.*, v2.* from t1 left join v2 on t1.id = v2.id;
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Expected result:
id id val1
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30631 NULL NULL
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Actual result:
id id val1
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30631 2 1
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Reproducible on maria/5.2, maria/5.3, maria/5.5, mysql/5.1, mysql/5.5, mysql/5.6
Attachments
Issue Links
- relates to
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- Closed
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Activity
Problem can be even expression over table fields (not only constants):
create table t1 ( id int );
insert into t1 values (30631);
create table t2 ( id int );
insert into t2 values (30631);
create algorithm=MERGE view v2 as select 2 as id, id is null as bbb, 1 as val1 from t2;
select t1., v2. from t1 left join v2 on t1.id = v2.id;
drop view v2;
drop table t1,t2;
explain extended shows why result is incorrect (see constants in the select list in transformed query):
Note 1003 select 30631 AS `id`,1 AS `Val1` from (select 30631 AS `id`) `Derived1` left join ((select 30631 AS `id`) `Derived3`) on(0) where 1
select 30631 AS `id`,1 AS `Val1` from (select 30631 AS `id`) `Derived1` left join ((select 30631 AS `id`) `Derived3`) on(0) where 1;