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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CASSANDRA-8079) Query specific keys from the map type
Date Wed, 08 Oct 2014 07:08:33 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-8079?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sylvain Lebresne resolved CASSANDRA-8079.
-----------------------------------------
    Resolution: Duplicate

This is a duplicate of CASSANDRA-7396 and will be added eventually.

> Query specific keys from the map type
> -------------------------------------
>
>                 Key: CASSANDRA-8079
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8079
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Frank-Robert Kline
>
> Using the map type, we can set specific key+value pairs individually:
> {code}
> UPDATE users SET todo['first'] = 'value1'  WHERE user_id = 'frodo';
> UPDATE users SET todo['second'] = 'value2'  WHERE user_id = 'frodo';
> {code}
> There is no analogous way to request specific properties from a map by key. This is significant
when a map could potentially store many properties from which only a subset is required.
> Ideally, the query syntax would reflect the mutation syntax, as in:
> {code}
> SELECT todo['first'], todo['second'] FROM users WHERE user_id = 'frodo';
> {code}



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