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Bug#24630 Subselect query crashes mysqld

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The crash happens because second filling of the same I_S table happens in
case of subselect with order by. table->sort.io_cache previously allocated
in create_sort_index() is deleted during second filling
(function get_schema_tables_result). There are two places where
I_S table can be filled: JOIN::exec and create_sort_index().
To fix the bug we should check if the table was already filled
in one of these places and skip processing of the table in second.
This commit is contained in:
gluh@mysql.com/eagle.(none)
2007-02-12 16:06:14 +04:00
parent 0583c7c524
commit 47e537b47c
7 changed files with 93 additions and 13 deletions
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37
mysql-test/r/information_schema.result
View File

@ -1278,3 +1278,40 @@ table_name
t1
t2
drop table t1,t2;
select 1 as f1 from information_schema.tables where "CHARACTER_SETS"=
(select cast(table_name as char) from information_schema.tables
order by table_name limit 1) limit 1;
f1
1
select t.table_name, group_concat(t.table_schema, '.', t.table_name),
count(*) as num1
from information_schema.tables t
inner join information_schema.columns c1
on t.table_schema = c1.table_schema AND t.table_name = c1.table_name
where t.table_schema = 'information_schema' and
c1.ordinal_position =
(select isnull(c2.column_type) -
isnull(group_concat(c2.table_schema, '.', c2.table_name)) +
count(*) as num
from information_schema.columns c2 where
c2.table_schema='information_schema' and
(c2.column_type = 'varchar(7)' or c2.column_type = 'varchar(20)')
group by c2.column_type order by num limit 1)
group by t.table_name order by num1, t.table_name;
table_name group_concat(t.table_schema, '.', t.table_name) num1
CHARACTER_SETS information_schema.CHARACTER_SETS 1
COLLATIONS information_schema.COLLATIONS 1
COLLATION_CHARACTER_SET_APPLICABILITY information_schema.COLLATION_CHARACTER_SET_APPLICABILITY 1
COLUMNS information_schema.COLUMNS 1
COLUMN_PRIVILEGES information_schema.COLUMN_PRIVILEGES 1
KEY_COLUMN_USAGE information_schema.KEY_COLUMN_USAGE 1
ROUTINES information_schema.ROUTINES 1
SCHEMATA information_schema.SCHEMATA 1
SCHEMA_PRIVILEGES information_schema.SCHEMA_PRIVILEGES 1
STATISTICS information_schema.STATISTICS 1
TABLES information_schema.TABLES 1
TABLE_CONSTRAINTS information_schema.TABLE_CONSTRAINTS 1
TABLE_PRIVILEGES information_schema.TABLE_PRIVILEGES 1
TRIGGERS information_schema.TRIGGERS 1
USER_PRIVILEGES information_schema.USER_PRIVILEGES 1
VIEWS information_schema.VIEWS 1

24
mysql-test/t/information_schema.test
View File

@ -999,4 +999,28 @@ where table_schema = 'test' and table_name not in
where table_schema = 'test' and column_name = 'f3');
drop table t1,t2;
#
# Bug#24630 Subselect query crashes mysqld
#
select 1 as f1 from information_schema.tables where "CHARACTER_SETS"=
(select cast(table_name as char) from information_schema.tables
order by table_name limit 1) limit 1;
select t.table_name, group_concat(t.table_schema, '.', t.table_name),
count(*) as num1
from information_schema.tables t
inner join information_schema.columns c1
on t.table_schema = c1.table_schema AND t.table_name = c1.table_name
where t.table_schema = 'information_schema' and
c1.ordinal_position =
(select isnull(c2.column_type) -
isnull(group_concat(c2.table_schema, '.', c2.table_name)) +
count(*) as num
from information_schema.columns c2 where
c2.table_schema='information_schema' and
(c2.column_type = 'varchar(7)' or c2.column_type = 'varchar(20)')
group by c2.column_type order by num limit 1)
group by t.table_name order by num1, t.table_name;
# End of 5.0 tests.