cassandra – frozen in collection

cassandra – frozen in a collection

corerootz - Ravi Kiran Krovvidi NoSQL - Cassandra, HBase

Using frozen in a collection 

A frozen value serializes multiple components into a single value. Non-frozen types allow updates to individual fields. Cassandra treats the value of a frozen type as a blob. The entire value must be overwritten.

Note: You cannot use non-frozen collections for primary key columns. However, you can use frozen collections for primary key columns.
column_name <collection_type><cql_type, frozen<column_name>>

For example:

CREATE TABLE mykeyspace.users (
  id uuid PRIMARY KEY,
  name frozen <fullname>,
  direct_reports set<frozen <fullname>>,     // a collection set
  addresses map<text, frozen <address>>     // a collection map
);