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From "Nate McCall (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-2231) Add CompositeType comparer to the comparers provided in org.apache.cassandra.db.marshal
Date Wed, 02 Mar 2011 22:08:37 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13001709#comment-13001709
] 

Nate McCall commented on CASSANDRA-2231:
----------------------------------------

I see what tjake means here in that we want to duplicate the structure of a thrift message
for the column name, but that is essentially the flexibility we need in order to make JPA
relationships "work" over even a moderate number of entities. Eg. if for every index type
we want to add, we need to add a new CF, this will quickly become as infeasible (this is inherently
why we cannot use 2ndary indexes to begin with). 

Per Ed's last comment, how about a combination of Sylvain's approach with a more dynamic encoding
scheme that included a 'type' field between the length and the data? 

> 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.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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