bug: update float type data, return NULL

[davidshiz]

Have you read the Contributing Guidelines on issues?

• [X] I have read the Contributing Guidelines on issues.

Please confirm if bug report does NOT exists already ?

• [X] I confirm there is no existing issue for this

Describe the problem

mysql> create table t3 (
    ->         col_signed tinyint,
    ->         col_unsigned tinyint unsigned
    -> );
Query OK, 0 rows affected (0.02 sec)

mysql> insert into t3 values (123,124);
Query OK, 1 row affected (0.00 sec)

mysql> ALTER TABLE t3 ADD COLUMN col_float_signed FLOAT;
Query OK, 0 rows affected (0.09 sec)
Records: 0  Duplicates: 0  Warnings: 0

mysql> UPDATE t3 SET col_float_signed=col_signed + 0.1;
Query OK, 1 row affected (0.01 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> select * from t3;
+------------+--------------+------------------+
| col_signed | col_unsigned | col_float_signed |
+------------+--------------+------------------+
|        123 |          124 |             NULL |
+------------+--------------+------------------+
1 row in set (0.00 sec)

Expected behavior

mysql> select * from t3;
+------------+--------------+------------------+
| col_signed | col_unsigned | col_float_signed |
+------------+--------------+------------------+
|        123 |          124 |            123.1 |
+------------+--------------+------------------+
1 row in set (0.00 sec)

How To Reproduce

No response

Environment

root@ub01:~# /stonedb57/install//bin/mysqld --version
/stonedb57/install//bin/mysqld  Ver 5.7.36-StoneDB-v1.0.3 for Linux on x86_64 (build-)
build information as follow:
        Repository address: https://github.com/stoneatom/stonedb.git:stonedb-5.7-dev
        Branch name: stonedb-5.7-dev
        Last commit ID: 1fa5661e4
        Last commit time: Date:   Thu Mar 23 20:19:17 2023 +0800
        Build time: Date: Wed Mar 29 10:31:02 CST 2023

Are you interested in submitting a PR to solve the problem?

• [ ] Yes, I will!