View user-defined types (UDTs) in Amazon Keyspaces

Sign in to the Amazon Web Services Management Console, and open the Amazon Keyspaces console at https://console.amazonaws.cn/keyspaces/home.

In the navigation pane, choose Keyspaces, and then choose a keyspace from the list.

Choose the UDTs tab to review the list of all UDTs in the keyspace.

To review one UDT in detail, choose a UDT from the list.

On the Schematab you can review the schema. On the Used in tab you can see if this UDT is used in tables or other UDTs. Note that you can only delete UDTs that are not in use by either tables or other UDTs.

To see the types that are available in a given keyspace, you can use the following statement.

SELECT type_name
FROM system_schema_mcs.types
WHERE keyspace_name = 'my_keyspace';

To view the details about a specific type, you can use the following statement.

SELECT 
    keyspace_name,
    type_name,
    field_names,
    field_types,
    max_nesting_depth,
    last_modified_timestamp,
    status,
    direct_referring_tables,
    direct_parent_types
FROM system_schema_mcs.types
WHERE keyspace_name = 'my_keyspace' AND type_name = 'my_udt';

You can list all UDTs that exist in the account using DESC TYPE.

DESC TYPES;
                            
 Keyspace my_keyspace
 ---------------------------
 my_udt1  my_udt2
                            
 Keyspace my_keyspace2
 ---------------------------
 my_udt1

You can list all UDTs in the current selected keyspace using DESC TYPE.

USE my_keyspace;
my_keyspace DESC TYPES;
                            
my_udt1  my_udt2

To list the types available in a keyspace, you can use the list-types command.

aws keyspaces list-types
--keyspace-name 'my_keyspace'

The output of that command looks similar to this example.

{
    "types": [
        "my_udt",
        "parent_udt"
    ]
}

To view the details about a given type you can use the get-type command.

aws keyspaces get-type
--type-name 'my_udt'
--keyspace-name 'my_keyspace'

The output of this command looks similar to this example.

{
    "keyspaceName": "my_keyspace",
    "typeName": "my_udt",
    "fieldDefinitions": [
        {
            "name": "a",
            "type": "int"
        },
        {
            "name": "b",
            "type": "text"
        }
    ],
    "lastModifiedTimestamp": 1721328225776,
    "maxNestingDepth": 3
    "status": "ACTIVE",
    "directReferringTables": [],
    "directParentTypes": [
        "parent_udt"
    ],
    "keyspaceArn": "arn:aws:cassandra:us-east-1:111122223333:/keyspace/my_keyspace/"
}