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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CASSANDRA-6644) CQL: Select every nth row within the same partition key
Date Fri, 31 Jan 2014 14:44:08 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-6644?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sylvain Lebresne resolved CASSANDRA-6644.
-----------------------------------------

    Resolution: Duplicate

Alright, so I'll mark as dupe of CASSANDRA-4914.

> CQL: Select every nth row within the same partition key
> -------------------------------------------------------
>
>                 Key: CASSANDRA-6644
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6644
>             Project: Cassandra
>          Issue Type: Wish
>            Reporter: Jorge Bay
>
> In a time-series schema (like metrics), it is common to create roollups/buckets with
datapoints at different rate. 
> It would be nice to have a keyword in CQL to be able to retrieve one every nth row (within
a single storage engine wide row).
> For example, in the following schema: 
> CREATE TABLE metrics (
>  ...    metric_id varchar,
>  ...    ts timestamp,
>  ...    value float,
>  ...    PRIMARY KEY (metric_id, ts)
>  ... );
> The following query, will retrieve 1 in every 3 rows:
> (SKIP keyword or something like that, but don't focus on the syntax)
> SELECT ts, value WHERE metric_id = ? SKIP 2;
> This would be very useful for continuous (and somehow linear) metrics.



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