Inconsistent error with MySQL for GRANT CREATE USER ON <specific db>.*

[mjonss]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

create user testuser@localhost;
grant create user on test.* to testuser@localhost;

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

mysql> create user testuser@localhost;
Query OK, 0 rows affected (0.04 sec)

mysql> grant create user on test.* to testuser@localhost;
ERROR 1221 (HY000): Incorrect usage of DB GRANT and GLOBAL PRIVILEGES

3. What did you see instead (Required)

tidb> create user testuser@localhost;
Query OK, 0 rows affected (0.01 sec)

tidb> grant create user on test.* to testuser@localhost;
ERROR 1054 (42S22): Unknown column 'Create_user_priv' in 'field list'

4. What is your TiDB version? (Required)

tidb_version(): Release Version: v4.0.0-beta.2-2806-ga6ec081b8
Edition: Community
Git Commit Hash: a6ec081
Git Branch: HEAD
UTC Build Time: 2021-05-06 14:56:18
GoVersion: go1.13.8
Race Enabled: false
TiKV Min Version: v3.0.0-60965b006877ca7234adaced7890d7b029ed1306
Check Table Before Drop: false

[sylzd]

/assign

[ti-srebot]

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