Inserting multiple types in map in cassandra

Question

Is it possible in cassandra map to input different data types like if I have a table like

(id int, value map<text,text>)

Now I want to insert values in this table like

(1,{'test':'test1'})
(2,{'a':1})
(3,{'c':2})

Monegasque

Answer 1

The Cassandra Map type does not support values (or keys) of differing types. However, you could create a User Defined Type to handle that.

aploetz@cqlsh:stackoverflow2> CREATE TYPE testac (test text, a int, c int);

aploetz@cqlsh:stackoverflow2> CREATE TABLE testactable (
                                    key int, 
                                    values frozen<testac>,
                                    PRIMARY KEY (key));

aploetz@cqlsh:stackoverflow2> INSERT INTO testactable (key,values) 
                              VALUES (1,{test: 'test1', a: 1, c: 2});

aploetz@cqlsh:stackoverflow2> SELECT * FROm testactable ;

 key | values
-----+-----------------------------
   1 | {test: 'test1', a: 1, c: 2}

(1 rows)

Screenplay

Thanks, yes I know this, and this will not solve my problem at hand. Thank you anyways – Monegasque

Answer 2

Instead of having map in you case have it as text (String) column which will save you lots of space. Keep data in JSON format by stringifying it.

Flotage

Answer 3

No Cassandra does not support like this feature .cassandra Map is like java map and we know that java also does not support this . we have pass all value in map according to datatype .

Cynthiacynthie

Except Java has inheritance and you can have a value type of Object. – Ananthous