The behavior of NO_UNSIGNED_SUBTRACTION is not consistent with MySQL

[YangKeao]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

SET SQL_MODE='NO_UNSIGNED_SUBTRACTION'; CREATE TABLE t15 (a INT SIGNED, b INT UNSIGNED); INSERT INTO t15 VALUES (10, 20); SELECT * FROM t15 WHERE a - b < 0; DROP TABLE t15; SET SQL_MODE=default;

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

mysql> SET SQL_MODE='NO_UNSIGNED_SUBTRACTION'; CREATE TABLE t15 (a INT SIGNED, b INT UNSIGNED); INSERT INTO t15 VALUES (10, 20); SELECT * FROM t15 WHERE a - b < 0; DROP TABLE t15; SET SQL_MODE=default;
Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.06 sec)

Query OK, 1 row affected (0.01 sec)

+------+------+
| a    | b    |
+------+------+
|   10 |   20 |
+------+------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.02 sec)

Query OK, 0 rows affected (0.00 sec)

3. What did you see instead (Required)

mysql> SET SQL_MODE='NO_UNSIGNED_SUBTRACTION'; CREATE TABLE t15 (a INT SIGNED, b INT UNSIGNED); INSERT INTO t15 VALUES (10, 20); SELECT * FROM t15 WHERE a - b < 0; DROP TABLE t15; SET SQL_MODE=default;
Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.06 sec)

Query OK, 1 row affected (0.01 sec)

ERROR 1690 (22003): BIGINT value is out of range in '(10 - 20)'
Query OK, 0 rows affected (0.07 sec)

Query OK, 0 rows affected (0.00 sec)

4. What is your TiDB version? (Required)