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https://issues.apache.org/jira/browse/CASSANDRA-2231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13008302#comment-13008302
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Todd Nine commented on CASSANDRA-2231:
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Since this is primarily needed for ordering well defined queries and
collections, can we add a bitset to the composite type to represent sort
ordering? A lot of queries need the semantics of "order by logindate desc,
firstname asc, lastname asc". This would give is the ability to set the
descending flag on any one of the composite types allowing us to always have a
correctly order result set stored in the column name. In this case I would
simply set the bit 0 to signal to the composite it needs to order the first
field descending instead of the standard ascending.
> 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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