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https://issues.apache.org/jira/browse/CASSANDRA-9988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16103033#comment-16103033
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Benedict commented on CASSANDRA-9988:
-------------------------------------
Well, it's been a while since I looked at the internals, but iirc there is an
extremely common scenario in which we enumerate most of the contents of such an
iterator via search, and that is in the case of selecting columns from a row.
Since we already have binary search's best case and exponential search's worst
case in the benchmarks, and given we can expect the inverse scenario to be
common, why not supplement with that so we can see the two extremes?
> Introduce leaf-only iterator
> ----------------------------
>
> Key: CASSANDRA-9988
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9988
> Project: Cassandra
> Issue Type: Sub-task
> Reporter: Benedict
> Assignee: Jay Zhuang
> Priority: Minor
> Labels: patch
> Fix For: 4.0
>
> Attachments: 9988-data.png, 9988-result2.png, 9988-result3.png,
> 9988-result.png, 9988-test-result3.png, 9988-test-result-expsearch.xlsx,
> 9988-test-result-raw.png, 9988-test-result.xlsx, 9988-trunk-new.txt,
> 9988-trunk-new-update.txt, trunk-9988.txt
>
>
> In many cases we have small btrees, small enough to fit in a single leaf
> page. In this case it _may_ be more efficient to specialise our iterator.
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