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From "Sidharth (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-4920) Add Collation to abstract type to provide standard sort order for Strings
Date Tue, 06 Nov 2012 16:48:14 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-4920?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sidharth updated CASSANDRA-4920:
--------------------------------

    Priority: Minor  (was: Major)
    
> Add Collation to abstract type to provide standard sort order for Strings
> -------------------------------------------------------------------------
>
>                 Key: CASSANDRA-4920
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4920
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: API, Core
>    Affects Versions: 1.2.0 beta 1
>            Reporter: Sidharth
>            Priority: Minor
>              Labels: cassandra
>
> Adding a way to sort UTF8 based on a standard order(collation) is very useful. Say for
example you have wide rows where you cannot use cassandra's standard indexes(secondary/primary
index). Lets say each column had a string value that was either one of alphanumeric or purely
numeric.  
> Now lets say I want to index these values in a materialized views so I could look up
things by range of values (range makes sense as a standard ordering over my  alpha numeric
and numeric strings i.e. "12" < "10000").
> More specifically I add these values into a CompositeType and SliceRange over them for
the index to work and I dont really care weather its a alpha or a numeric, it should be in
the order that follows collation semantics as follows:
> 1) If the string is a numeric then it should be comparable like a numeric
> 2) If its a alpha then it should be comparable like a normal string. 
> 3) If its a alhpa-numeric then a contiguos sequence of numbers in the string should be
compared as numbers like "c10" > "c2".
> 4) UTF8 type strings assumed everywhere.

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