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From "Benjamin Lerer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-10707) Add support for Group By to Select statement
Date Thu, 28 Apr 2016 13:19:13 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15262117#comment-15262117
] 

Benjamin Lerer commented on CASSANDRA-10707:
--------------------------------------------

I pushed a new patch that should fix the short read logic and that add support for {{PER PARTITION
LIMIT}} with {{GROUP BY}}. The patch also add extra tests for range name queries.
|[c* branch|https://github.com/blerer/cassandra/tree/10707-trunk]|[dtest branch|https://github.com/riptano/cassandra-dtest/compare/master...blerer:CASSANDRA-10707?expand=1]|[utests|http://cassci.datastax.com/view/Dev/view/blerer/job/blerer-10707-trunk-testall/]|[dtests|http://cassci.datastax.com/view/Dev/view/blerer/job/blerer-10707-trunk-dtest/]|



> Add support for Group By to Select statement
> --------------------------------------------
>
>                 Key: CASSANDRA-10707
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10707
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: CQL
>            Reporter: Benjamin Lerer
>            Assignee: Benjamin Lerer
>
> Now that Cassandra support aggregate functions, it makes sense to support {{GROUP BY}}
on the {{SELECT}} statements.
> It should be possible to group either at the partition level or at the clustering column
level.
> {code}
> SELECT partitionKey, max(value) FROM myTable GROUP BY partitionKey;
> SELECT partitionKey, clustering0, clustering1, max(value) FROM myTable GROUP BY partitionKey,
clustering0, clustering1; 
> {code}



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