doc/modules/cassandra/examples/BNF/alter_udt_statement.bnf - cassandra - Git at Google

 alter_type_statement::= ALTER TYPE [ IF EXISTS ] udt_name alter_type_modification
 alter_type_modification::= ADD [ IF NOT EXISTS ] field_definition
         | RENAME [ IF EXISTS ] identifier TO identifier (AND identifier TO identifier )*
	alter_type_statement::= ALTER TYPE [ IF EXISTS ] udt_name alter_type_modification
	alter_type_modification::= ADD [ IF NOT EXISTS ] field_definition
	\| RENAME [ IF EXISTS ] identifier TO identifier (AND identifier TO identifier )*