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Ed Anuff commented on CASSANDRA-2355:
-------------------------------------
In Cassandra-2231 it was suggested that this be implemented by making
comparators parameterizable. The idea would be to perhaps replace
FBUtilities.getComparator() with a ComparatorFactory that could be passed
something like "UUIDType(restrictTo=time,sort=desc)" and parse out the
parameters in order to construct the instance. For Cassandra-2231, the
proposed patch requires that FBUtilities.getComparator() caches and returns the
same singleton comparator instances, so that requesting "UUIDType" will always
return the same instance. It would be necessary to cache the parameterized
version in a similar way, and would probably need to be able to know that
"UUIDType(restrictTo=time,sort=desc)" and "UUIDType(sort=desc,restrictTo=time)"
should return the same cached comparator.
> Have an easy way to define the reverse comparator of any comparator
> -------------------------------------------------------------------
>
> Key: CASSANDRA-2355
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2355
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Sylvain Lebresne
> Assignee: Sylvain Lebresne
> Priority: Minor
> Original Estimate: 4h
> Remaining Estimate: 4h
>
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