cassandra-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-7017) allow per-partition LIMIT clause in cql
Date Tue, 01 Jul 2014 08:00:47 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-7017?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sylvain Lebresne updated CASSANDRA-7017:
----------------------------------------

    Fix Version/s: 3.0

> allow per-partition LIMIT clause in cql
> ---------------------------------------
>
>                 Key: CASSANDRA-7017
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7017
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jonathan Halliday
>            Assignee: Benjamin LERER
>              Labels: cql
>             Fix For: 3.0
>
>
> somewhat related to static columns (#6561) and slicing (#4851), it is desirable to apply
a LIMIT on a per-partition rather than per-query basis, such as to retrieve the top (most
recent, etc) N clustered values for each partition key, e.g.
> -- for each league, keep a ranked list of users
> create table scores (league text, score int, player text, primary key(league, score,
player) );
> -- get the top 3 teams in each league:
> select * from scores staticlimit 3;
> this currently requires issuing one query per partition key, which is tedious if all
the key partition key values are known and impossible if they aren't.



--
This message was sent by Atlassian JIRA
(v6.2#6252)

Mime
View raw message