Bad error message for numeric conversion

[sayJason]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

DROP TABLE IF EXISTS t0; 
CREATE TABLE t0 (c0 DECIMAL); 
INSERT INTO t0 VALUES (1);
SELECT * FROM t0 WHERE t0.c0 > 'a'; 
SHOW WARNINGS;

2. What did you expect to see? (Required)

A specific type of error for external applications like MySQL.

+---------+------+----------------------------------------+
| Level   | Code | Message                                |
+---------+------+----------------------------------------+
| Warning | 1292 | Truncated incorrect DECIMAL value: 'a' |
+---------+------+----------------------------------------+
1 row in set (0.00 sec)

3. What did you see instead (Required)

+---------+------+------------+
| Level   | Code | Message    |
+---------+------+------------+
| Warning | 8029 | Bad Number |
+---------+------+------------+
1 row in set (0.00 sec)

4. What is your TiDB version? (Required)

+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| tidb_version()

                                                                       |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Release Version: v5.4.0
Edition: Community
Git Commit Hash: 55f3b24c1c9f506bd652ef1d162283541e428872
Git Branch: heads/refs/tags/v5.4.0
UTC Build Time: 2022-01-25 08:39:26
GoVersion: go1.16.4
Race Enabled: false
TiKV Min Version: v3.0.0-60965b006877ca7234adaced7890d7b029ed1306
Check Table Before Drop: false |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

[fanrenhoo]

/assign