show create procedure mysql.AddGeometryColumn;
Procedure	sql_mode	Create Procedure	character_set_client	collation_connection	Database Collation
AddGeometryColumn		CREATE DEFINER=`mariadb.sys`@`localhost` PROCEDURE `AddGeometryColumn`(catalog varchar(64), t_schema varchar(64),
   t_name varchar(64), geometry_column varchar(64), t_srid int)
    SQL SECURITY INVOKER
begin
  set @qwe= concat('ALTER TABLE ', t_schema, '.', t_name, ' ADD ', geometry_column,' GEOMETRY REF_SYSTEM_ID=', t_srid); PREPARE ls from @qwe; execute ls; deallocate prepare ls; end	latin1	latin1_swedish_ci	latin1_swedish_ci
show create procedure mysql.DropGeometryColumn;
Procedure	sql_mode	Create Procedure	character_set_client	collation_connection	Database Collation
DropGeometryColumn		CREATE DEFINER=`mariadb.sys`@`localhost` PROCEDURE `DropGeometryColumn`(catalog varchar(64), t_schema varchar(64),
   t_name varchar(64), geometry_column varchar(64))
    SQL SECURITY INVOKER
begin
  set @qwe= concat('ALTER TABLE ', t_schema, '.', t_name, ' DROP ', geometry_column); PREPARE ls from @qwe; execute ls; deallocate prepare ls; end	latin1	latin1_swedish_ci	latin1_swedish_ci
create table t1 (a int, b int);
call mysql.AddGeometryColumn('', 'test', 't1', 'c', 10);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) DEFAULT NULL,
  `b` int(11) DEFAULT NULL,
  `c` geometry DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
call mysql.DropGeometryColumn('', 'test', 't1', 'c');
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) DEFAULT NULL,
  `b` int(11) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
call mysql.DropGeometryColumn('', 'test', 't1', 'b');
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1;
create user foo@localhost;
grant execute on mysql.* to foo@localhost;
connect  foo, localhost, foo;
call mysql.AddGeometryColumn('', 'mysql', 'proc', 'c', 10);
ERROR 42000: ALTER command denied to user 'foo'@'localhost' for table 'proc'
disconnect foo;
connection default;
drop user foo@localhost;