User-defined type 

A user-defined type facilitates handling multiple fields of related information in a table.

Cassandra 2.1 supports user-defined types. A user-defined type facilitates handling multiple fields of related information in a table. Applications that required multiple tables can be simplified to use fewer tables by using a user-defined type to represent the related fields of information instead of storing the information in a separate table. The address type example demonstrates how to use a user-defined type.

You can create, alter, and drop a user-defined type using these commands: The cqlsh utility includes these commands for describing a user-defined type or listing all user-defined types: The scope of a user-defined type is the keyspace in which you define it. Use dot notation to access a type from a keyspace outside its scope: keyspace name followed by a period followed the name of the type. Cassandra accesses the type in the specified keyspace, but does not change the current keyspace; otherwise, if you do not specify a keyspace, Cassandra accesses the type within the current keyspace.