mainly to avoid the pattern of
* get username/hostname/rolename
* optionally find the corresponding ACL_USER and ACL_ROLE
* allocate memory, concatenate username/hostname/rolename
* call a function passing only this memory as an argument
** use concatenated username/etc to find ACL_USER and ACL_ROLE again
** do something
* free the object
Also to undo push_dynamic we use pop_dynamic now,
not a linear search/scan through the dynamic array.
as a bonus, role@ is now an invalid way to refer to a role.
mysql-test/r/acl_roles_show_grants.result:
one can do SHOW GRANTS for himself
mysql-test/t/acl_roles_set_role-table-column-priv.test:
correct error message
mysql-test/t/acl_roles_show_grants.test:
one can SHOW GRANTS for himself
sql/sql_acl.cc:
bugfixing:
* don't assign with && - it can shortcut and the second assignment won't be executed
* correct the test in check_grant_all_columns() - want_access should not be modified
*
sql/sql_cmd.h.OTHER:
add new commands at the end
sql/sql_db.cc:
don't call acl_get() if all privileges are already satisfied
(crashes when run with --skip-grants, because acl data stuctures aren't initialized)
sql/sql_parse.cc:
* test for current_user in get_current_user()
* map explicitly specified user@host to current_user
