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Benedict commented on CASSANDRA-9471:
-------------------------------------
I've rebased this and introduced unit tests to cover the majority of
functionality. All of which was already present but not covered.
> Columns should be backed by a BTree, not an array
> -------------------------------------------------
>
> Key: CASSANDRA-9471
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9471
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Benedict
> Assignee: Benedict
> Fix For: 3.0 beta 1
>
>
> Follow up to 8099.
> We have pretty terrible lookup performance as the number of columns grows
> (linear). In at least one location, this results in quadratic performance.
> We don't however want this structure to be either any more expensive to
> build, nor to store. Some small modifications to BTree will permit it to
> serve here, by permitting efficient lookup by index, and calculation _of_
> index for a given key.
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