How do I update a tuple in Cassandra?

Question

There are literary no tutorials on how to update tuples on Google. Can someone explain how tuples can be updated in Cassandra?

Answer 1

The CQL tuple data type is implicitly "frozen" without needing the CQL frozen keyword so you can't update individual elements of a tuple column -- you need to update the whole column.

To illustrate, here's my example CQL table:

CREATE TABLE sensors (
    id text PRIMARY KEY,
    location tuple<decimal, decimal>,
    temperature decimal,
    weight int
)

Here's an example where I insert a sensor with its location:

INSERT INTO sensors (id, location)
    VALUES ('abc123', (50.4501, 30.5234));

Here's an example where I update the location of a sensor:

UPDATE sensors
    SET location = (47.0971, 37.5434)
    WHERE id = 'abc123';

For details, see CQL tuple type. Cheers!