[ https://issues.apache.org/jira/browse/CASSANDRA-4920?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sidharth updated CASSANDRA-4920: -------------------------------- Summary: Add Collation semantics to abstract type to provide standard sort order for Strings (was: Add Collation to abstract type to provide standard sort order for Strings) > Add Collation semantics 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 below described collation semantics can be > useful. > Use case: 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 and you wanted an > index by value. MOre specifically you want to slice range over a bunch of > column values and say "get me all the ID's associated with value ABC to XYZ > ". As usual I would index these values in a materialized views > More specifically I create an index CF; And add these values into a > CompositeType column and SliceRange over them for the indexing to work and I > dont really care weather its a alpha or a numeric as long as its ordered by > the following 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. > How this helps?: > 1) You dont end up creating multiple CF for different value types. > 2) You dont have to write boiler plate to do complicated type detection and > do this manually in the application. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira