[jira] [Created] (CASSANDRA-5956) Allow filtering on more than 1 clustered components

["DOAN DuyHai (JIRA)" <ji...@apache.org>]

DOAN DuyHai created CASSANDRA-5956:
--------------------------------------

             Summary: Allow filtering on more than 1 clustered components
                 Key: CASSANDRA-5956
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5956
             Project: Cassandra
          Issue Type: Improvement
          Components: API, Core
            Reporter: DOAN DuyHai


Right now I am preparing some slides for a talk and tutorial on Cassandra to convince people switching from Thrift to CQL3. However I am facing serious issue because of the limitation of CQL3 not being able to allow inequality on more than 1 clustered component at a time.

 My example is quite trivial. Let's consider a table to collect daily metrics

{code:sql}
CREATE TABLE daily_metrics
(
  day int, // day in YYYYMMDD format
  hour int, 
  minute int,
  second int,
  metrics blob, 
  PRIMARY KEY (day, hour, minute, second)
)
{code}

 I should be able to grep all metrics from a range of date

  // select all metrics from 8:30am to 10am
 {code:sql}
 SELECT metrics FROM daily_metrics WHERE day = 20130828 AND hour >= 8 AND minute >= 30 and hour <= 10
 {code}

 // select all metrics of the day from 6:30pm
 {code:sql}
 SELECT metrics FROM daily_metrics WHERE day = 20130828 AND hour >= 18 AND minute >= 30 
 {code}

 
 Right now it is just IMPOSSIBLE to do this kind of query with CQL3, which is PITA. We always get the error message

{quote}
Bad Request: PRIMARY KEY part minute cannot be restricted (preceding part hour is either not restricted or by a non-EQ relation)
{quote}

 I know that there is already jira [CASSANDRA-4415|https://issues.apache.org/jira/browse/CASSANDRA-4415] which is a really  good idea and also [CASSANDRA-4851|https://issues.apache.org/jira/browse/CASSANDRA-4851] but the issue raised above is *beyond the scope of just paging data*.

 People are using more and more compound primary keys to model with Cassandra and they should be able to do slice queries with inequality from all compound components.

 There are lots of use cases where such usage is required.




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