Details
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Bug
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Status: Open (View Workflow)
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Major
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Resolution: Unresolved
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10.6, 11.6(EOL)
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None
Description
SET @@note_verbosity='all'; |
CREATE OR REPLACE TABLE t1 (f char(8), KEY(f)); |
INSERT INTO t1 VALUES (''),(''); |
SELECT * FROM t1 WHERE f BETWEEN 'a' AND 3; |
SHOW WARNINGS;
|
+---------+------+----------------------------------------------------------------------------------------------------------------------------+
|
| Level | Code | Message |
|
+---------+------+----------------------------------------------------------------------------------------------------------------------------+
|
| Note | 1105 | Cannot use key `f` part[0] for lookup: `test`.`t1`.`f` of collation `utf8mb4_uca1400_ai_ci` >= "'a'" of collation `binary` |
|
| Warning | 1292 | Truncated incorrect DECIMAL value: '' |
|
| Warning | 1292 | Truncated incorrect DECIMAL value: 'a' |
|
| Warning | 1292 | Truncated incorrect DECIMAL value: '' |
|
| Warning | 1292 | Truncated incorrect DECIMAL value: 'a' |
|
+---------+------+----------------------------------------------------------------------------------------------------------------------------+
|
Notice, the warning about the unusable key is incorrect. It should report a wrong data type instead, because the comparison is done using the DECIMAL data type.
If I change the order of the BETNEEN values, it correctly reports the data type problem:
SELECT * FROM t1 WHERE f BETWEEN 3 AND 'a'; |
SHOW WARNINGS;
|
+---------+------+--------------------------------------------------------------------------------------------+
|
| Level | Code | Message |
|
+---------+------+--------------------------------------------------------------------------------------------+
|
| Note | 1105 | Cannot use key `f` part[0] for lookup: `test`.`t1`.`f` of type `char` >= "3" of type `int` |
|
| Warning | 1292 | Truncated incorrect DOUBLE value: '' |
|
| Warning | 1292 | Truncated incorrect DOUBLE value: 'a' |
|
| Warning | 1292 | Truncated incorrect DOUBLE value: '' |
|
| Warning | 1292 | Truncated incorrect DOUBLE value: 'a' |
|
+---------+------+--------------------------------------------------------------------------------------------+
|
Attachments
Issue Links
- relates to
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MDEV-32203 Raise notes when an index cannot be used on data type mismatch
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- Closed
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- Closed
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- Closed
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- Open
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