[jira] [Created] (CASSANDRA-7017) allow per-partition LIMIT clause in cql

["Jonathan Halliday (JIRA)" <ji...@apache.org>]

Jonathan Halliday created CASSANDRA-7017:
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             Summary: 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


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.



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