In this post, I am sharing a demonstration of Cassandra Collection data types.

Basically, CQL provides three different types of collection data types, SET, LIST, MAP.
Using collection data types, you can store multiple values in a single column.

You can store multiple values in a single column, but try to keep your collection small otherwise it creates performance overhead.

Collection data types:

Create a sample table with collectio data type
(SET, LIST, MAP):

CREATE TABLE IF NOT EXISTS tbl_Employee
(
    EmpID INT PRIMARY KEY 
    ,EmpName VARCHAR
    ,Emails SET<text>
    ,Hobbies LIST<text>
    ,Address MAP<text,text>
) ;

Insert a sample record:

INSERT INTO tbl_Employee
(EmpID,EmpName,Emails,Hobbies,Address)
VALUES
(
    1
    ,'Anvesh'
    ,{'test1@gmail.com','test2@gmail.com'}
    ,['Blogging','Animation','Photography']
    ,{'home': 'Gujarat', 'office': 'Hyderabad'}
);

Update data on Collection type:

UPDATE tbl_Employee SET Emails = Emails + {'test3@gmail.com'} WHERE EmpID=1;
UPDATE tbl_Employee SET Hobbies = Hobbies + ['Watching Movies'] WHERE EmpID=1;
UPDATE tbl_Employee SET Address = Address + {'farm':'Bhavnagar'} WHERE EmpID=1;

Filter on Collection type:

SELECT * FROM tbl_Employee WHERE Address CONTAINS 'Gujarat' ALLOW FILTERING;
SELECT * FROM tbl_Employee WHERE Hobbies CONTAINS 'Blogging' ALLOW FILTERING;
SELECT * FROM tbl_Employee WHERE Emails CONTAINS 'test1@gmail.com' ALLOW FILTERING;