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From "Ed Anuff (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-2231) Add CompositeType comparer to the comparers provided in org.apache.cassandra.db.marshal
Date Thu, 03 Mar 2011 18:12:39 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13002118#comment-13002118
] 

Ed Anuff commented on CASSANDRA-2231:
-------------------------------------

Sylvain, this looks like it could do the trick.

Just to clarify, in your example, if I declare something like this:

DynamicCompositeType(b => BytesType, t => TimeUUIDType)

Does this mean that I can have any number of components in my dynamic composite key and that
"b" and "t" are aliases to BytesType and TimeUUIDType for the purpose of space efficienct?
 Using both or neither of those aliases is valid and the order in which I use them isn't mandated,
correct?


> Add CompositeType comparer to the comparers provided in org.apache.cassandra.db.marshal
> ---------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-2231
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2231
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Contrib
>    Affects Versions: 0.7.3
>            Reporter: Ed Anuff
>            Priority: Minor
>         Attachments: 0001-Add-compositeType-and-DynamicCompositeType.patch, 0001-Add-compositeType.patch,
edanuff-CassandraCompositeType-1e253c4.zip
>
>
> CompositeType is a custom comparer that makes it possible to create comparable composite
values out of the basic types that Cassandra currently supports, such as Long, UUID, etc.
 This is very useful in both the creation of custom inverted indexes using columns in a skinny
row, where each column name is a composite value, and also when using Cassandra's built-in
secondary index support, where it can be used to encode the values in the columns that Cassandra
indexes.  One scenario for the usage of these is documented here: http://www.anuff.com/2010/07/secondary-indexes-in-cassandra.html.
 Source for contribution is attached and has been previously maintained on github here: https://github.com/edanuff/CassandraCompositeType

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