Sidharth created CASSANDRA-4920:
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Summary: 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
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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