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https://issues.apache.org/jira/browse/CASSANDRA-2231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13008505#comment-13008505
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Ed Anuff commented on CASSANDRA-2231:
-------------------------------------
For parameterized behavior of comparators, my assumption is that this would
work within the DynamicCompositeType as well? I'll add this to Cassandra-2235,
but I'm thinking about the embedded comparator names in the dynamic format.
Right now, you're simply calling FBUtilities.getComparator() with the name, but
ultimately we'd need a more robust comparator factory that could be passed
something like "UUIDType(restrictTo=time,sort=desc)" and parse out the
parameters in order to construct the instance and was able to cache the
parameterized version in a similar way to how your patch currently caches the
comparators it instantiates, and would probably need to be able to know that
"UUIDType(restrictTo=time,sort=desc)" and "UUIDType(sort=desc,restrictTo=time)"
are the same comparator.
> 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: 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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