grant_stmt ::=
	
	'GRANT' ( role_name ) ( ( ',' role_name ) )* 'TO' ( user_name ) ( ( ',' user_name ) )*
	| 'GRANT' ( role_name ) ( ( ',' role_name ) )* 'TO' ( user_name ) ( ( ',' user_name ) )* 'WITH' 'ADMIN' 'OPTION'
