Function `period_add ` is not compatible with MySQL 8.0

[lonng]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. What did you do?
   If possible, provide a recipe for reproducing the error.

The period_add behavior is not compatible with MySQL 8.0

2. What did you expect to see?

MySQL 8.0:

mysql> select period_add(128081,887);
ERROR 1210 (HY000): Incorrect arguments to period_add
mysql> select period_add(128011,887);
+------------------------+
| period_add(128011,887) |
+------------------------+
|                 135410 |
+------------------------+
1 row in set (0.00 sec)

3. What did you see instead?

mysql> select period_add(128081,887);
+------------------------+
| period_add(128081,887) |
+------------------------+
|                 136008 |
+------------------------+
1 row in set (0.00 sec)

mysql> select period_add(128011,887);
+------------------------+
| period_add(128011,887) |
+------------------------+
|                 135410 |
+------------------------+
1 row in set (0.00 sec)

4. What version of TiDB are you using (tidb-server -V or run select tidb_version(); on TiDB)?

mysql> select tidb_version();
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| tidb_version()                                                                                                                                                                                                                                                                                                                                           |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Release Version: v3.0.0-beta.1-187-g5876abd70
Git Commit Hash: 5876abd70ccc054704ab0e8cbf02ed129c6efc76
Git Branch: refine-point-get-failpoint
UTC Build Time: 2019-04-30 03:35:49
GoVersion: go version go1.12 darwin/amd64
Race Enabled: false
TiKV Min Version: 2.1.0-alpha.1-ff3dd160846b7d1aed9079c389fc188f7f5ea13e
Check Table Before Drop: false |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.01 sec)