Cassandra: Is there a limit to amount of data that a collection column can hold?

Question

In the below table, what is the maximum size phone_numbers column can accommodate ?

1. Like normal columns, is it 2GB ?
2. Is it 64K*64K as mentioned here

CREATE TABLE d2.employee (
    id int PRIMARY KEY,
    doj timestamp,
    name text,
    phone_numbers map<text, text>
)

Answer 1

Collection types in Cassandra are represented as a set of distinct cells in the internal data model: you will have a cell for each key of your phone_numbers column. Therefore they are not normal columns, but a set of columns. You can verify this by executing the following command in cassandra-cli (1001 stands for a valid employee id):

use d2;
get employee[1001];

The good answer is your point 2.