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