Details
-
Bug
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Status: Closed (View Workflow)
-
Major
-
Resolution: Fixed
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5.3.12, 5.5.38, 10.0.13
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None
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None
Description
This script:
drop table if exists t1; |
create table t1 (a varchar(10) character set utf8); |
insert into t1 values ('aaa'); |
select concat(a, 0xFF), charset(concat(a, 0xFF)) from t1; |
returns a badly formed result:
+-----------------+--------------------------+
|
| concat(a, 0xFF) | charset(concat(a, 0xFF)) |
|
+-----------------+--------------------------+
|
| aaa� | utf8 |
|
+-----------------+--------------------------+
|
Notice, character set of the result is utf8, but the returned string
is not a valid utf8 string.
The correct behaviour would be to return an error, as 0xFF is a bad utf8 string.
A similar problem happens with UNION:
drop table if exists t1; |
create table t1 (a varchar(10) character set utf8); |
insert into t1 values ('aaa'); |
select a from t1 union select 0xFF; |
show warnings;
|
returns:
+------+
|
| a |
|
+------+
|
| aaa |
|
| |
|
+------+
|
2 rows in set, 1 warning (0.00 sec)
|
|
|
+---------+------+--------------------------------------------------------+
|
| Level | Code | Message |
|
+---------+------+--------------------------------------------------------+
|
| Warning | 1366 | Incorrect string value: '\xFF' for column 'a' at row 2 |
|
+---------+------+--------------------------------------------------------+
|
1 row in set (0.00 sec)
|
The correct behaviour would be to return an error.