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https://issues.apache.org/jira/browse/CASSANDRA-2231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13012531#comment-13012531
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Ed Anuff commented on CASSANDRA-2231:
-------------------------------------
Sylvain, in the JPA implementation, we're seeing that we'd like to have a
little more flexibility with the trailing end-of-component, specifically, that
it be able to have values of -1,0,1 rather than just 0,1. The comparison logic
would look like this:
{noformat}
byte b1 = bb1.get();
byte b2 = bb2.get();
if (b1 < 0) {
if (b2 >= 0) {
return -1;
}
}
if (b1 > 0) {
if (b2 <= 0) {
return 1;
}
}
if ((b1 == 0) && (b2 != 0)) {
return - b2;
}
{noformat}
> 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
> Assignee: Sylvain Lebresne
> Priority: Minor
> Fix For: 0.7.5
>
> Attachments: CompositeType-and-DynamicCompositeType.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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