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https://issues.apache.org/jira/browse/CASSANDRA-9473?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis resolved CASSANDRA-9473.
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Resolution: Duplicate
subsumed into CASSANDRA-9471
> Introduce BTreeSet with support for in-place reversal
> -----------------------------------------------------
>
> Key: CASSANDRA-9473
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9473
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Benedict
> Assignee: Paulo Motta
> Priority: Minor
> Fix For: 3.x
>
>
> Follow up to CASSANDRA-8099.
> We use TreeSet in a lot of places unnecessarily. This is especially a concern
> now that we store the set of rows we're searching for in both forward and
> (potentially) reverse order, which we have to construct twice. A very simple
> wrapper around BTree (which we had previously, but did not employ) would
> permit us to reverse this collection without any extra work, can be built
> more cheaply, consumes less memory, and supports the SearchIterator
> interface, so can be iterated more efficiently.
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