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From "Ed Anuff (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (CASSANDRA-2231) Add CompositeType comparer to the comparers provided in org.apache.cassandra.db.marshal
Date Fri, 18 Mar 2011 04:32:29 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13008321#comment-13008321
] 

Ed Anuff edited comment on CASSANDRA-2231 at 3/18/11 4:30 AM:
--------------------------------------------------------------

>From the email conversation around this earlier today, I'm wondering if a bit in the trailing
byte at the end of each component could be used for a sort order flag?

For context, we're looking at doing something in the JPA implementation via annotations that's
functionally similar to how App Engine defines indexes in it's index.yaml - http://code.google.com/appengine/docs/java/configyaml/indexconfig.html



      was (Author: edanuff):
    From the email conversation around this earlier today, I'm wondering if a bit in the trailing
byte at the end of each component could be used for a sort order flag?
  
> 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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