Show grants in version 2.3 can't display authentication information

[wangsimo0]

Enhancement

In version 2.3, the show grants command can't display authentication information anymore. We need another way to check those information.

[wangsimo0]

show authentication; display authentication information for the user. show all authentication; display all authentication information. The required privilege will be identical to show all grants. show authentication for <user_name>; display all authentication information. The required privilege will be identical to show grants for <user_name>;.