DROP TYPE 

Drop a user-defined type.

Immediately and irreversibly removes a UDT (user-defined type).
Restriction: Dropping a user-defined type that is in use by a table or another type is not supported.

Synopsis 

DROP TYPE [IF EXISTS] keyspace_name.type_name
Legend
Syntax conventions Description
UPPERCASE Literal keyword.
Lowercase Not literal.
Italics Variable value. Replace with a user-defined value.
[] Optional. Square brackets ( [] ) surround optional command arguments. Do not type the square brackets.
( ) Group. Parentheses ( ( ) ) identify a group to choose from. Do not type the parentheses.
| Or. A vertical bar ( | ) separates alternative elements. Type any one of the elements. Do not type the vertical bar.
... Repeatable. An ellipsis ( ... ) indicates that you can repeat the syntax element as often as required.
'Literal string' Single quotation ( ' ) marks must surround literal strings in CQL statements. Use single quotation marks to preserve upper case.
{ key : value } Map collection. Braces ( { } ) enclose map collections or key value pairs. A colon separates the key and the value.
<datatype1,datatype2> Set, list, map, or tuple. Angle brackets ( < > ) enclose data types in a set, list, map, or tuple. Separate the data types with a comma.
cql_statement; End CQL statement. A semicolon ( ; ) terminates all CQL statements.
[--] Separate the command line options from the command arguments with two hyphens ( -- ). This syntax is useful when arguments might be mistaken for command line options.
' <schema> ... </schema> ' Search CQL only: Single quotation marks ( ' ) surround an entire XML schema declaration.
@xml_entity='xml_entity_type' Search CQL only: Identify the entity and literal value to overwrite the XML element in the schema and solrConfig files.

Examples 

Attempting to drop a type that is in use by a table:
DROP TYPE cycling.basic_info ;
Error message with the table names that contain the type:
InvalidRequest: Error from server: code=2200 [Invalid query] message="Cannot drop user type cycling.basic_info as it is still used by table cycling.cyclist_stats"
Drop the table:
DROP TABLE cycling.cyclist_stats ;
Drop the type:
DROP TYPE cycling.basic_info ;