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From "Julien Muller (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-11510) Clustering key and secondary index
Date Wed, 06 Apr 2016 10:30:25 GMT
Julien Muller created CASSANDRA-11510:
-----------------------------------------

             Summary: Clustering key and secondary index
                 Key: CASSANDRA-11510
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11510
             Project: Cassandra
          Issue Type: Bug
          Components: CQL
         Environment: ubuntu 14.04 LTS
            Reporter: Julien Muller
             Fix For: 3.4, 3.3


I noticed the following change in behavior while migrating from 2.0.11: Elements of the clustering
key seems to not be secondary indexable anymore.

Using this table:
{code:sql}
CREATE TABLE table1 (
    name text,
    class int,
    inter text,
    power int,
    PRIMARY KEY (name, class, inter)
) WITH CLUSTERING ORDER BY (class DESC, inter ASC);
INSERT INTO table1 (name, class, inter, power) VALUES ('R1',1, 'int1',13);
INSERT INTO table1 (name, class, inter, power) VALUES ('R1',2, 'int1',18);
INSERT INTO table1 (name, class, inter, power) VALUES ('R1',3, 'int1',37);
INSERT INTO table1 (name, class, inter, power) VALUES ('R1',4, 'int1',49);
{code}

In version 2.0.11, I used to have a secondary index on inter, that allowed me to make fast
queries on the table:
{code:sql}
CREATE INDEX table1_inter ON table1 (inter);
SELECT * FROM table1 where name='R1' AND class>0 AND class<4 AND inter='int1' ALLOW
FILTERING;
{code}

While testing on 3.3.0, I get the following message:
Clustering column "inter" cannot be restricted (preceding column "class" is restricted by
a non-EQ relation)
It seems to only be considered as a key and the index and ALLOW FILTERING are not taken into
account anymore (as it was in 2.0.11).

I found the following workaround: 
Duplicate the column inter as a regular column, and simply query it with the secondary index
and no ALLOW FILTERING. It looks like the behavior I would anticipate and do not understand
why it does not work on inter only because it is a clustering key. The only answer on the
ml evokes a bug.



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