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From "Jonathan Ellis (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CASSANDRA-3340) Add a default range to queries
Date Thu, 13 Oct 2011 19:05:12 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-3340?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis resolved CASSANDRA-3340.
---------------------------------------

    Resolution: Duplicate

It sounds like this is a special case of being able to request multiple ranges in a single
api call.  We already have tickets open for that (CASSANDRA-2710, CASSANDRA-3069).
                
> Add a default range to queries
> ------------------------------
>
>                 Key: CASSANDRA-3340
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3340
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: David Semeria
>            Priority: Minor
>
> Often we find ourselves having to make two nearly identical queries when in theory one
could suffice.
> Assuming we're storing json properites in discrete columns, a typical user row might
look like this:
> default:name, default:age,... address:street, address:number,...  contacts:email, contacts,phone,
contacts:mobile....
> To extract the contacts for a given user we would pass startCol = 'contacts', endCol
= 'contacts' + charAfter(':')
> However, we frequently also need to retrieve the properties under the 'default' key.
To do this we currently need to make a second nearly identical query, with the only difference
that startCol and endCol now refer to 'default'
> It would be nice if we could pass in a default range along with the standard range during
queries. 
> It seems inefficient to make Cassandra extract the same row(s) twice, with the only difference
being how they are filtered.
> I'm not in a position to estimate how many other users might find this functionality
useful, all I can say is that we certainly would.
> Thanks. 

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