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https://issues.apache.org/jira/browse/LUCENE-4780?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13579628#comment-13579628
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Adrien Grand commented on LUCENE-4780:
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bq. So this works even if its "mostly monotonic" but not always?
Even if not at all. The test case even tests it with completely random longs.
bq. In this case we would just get some negative deviations right?
Right.
> MonotonicAppendingLongBuffer
> ----------------------------
>
> Key: LUCENE-4780
> URL: https://issues.apache.org/jira/browse/LUCENE-4780
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Fix For: 4.2
>
> Attachments: LUCENE-4780.patch
>
>
> IndexWriter uses AppendingLongBuffer in several places, and in a few of them
> the mapping is monotonically increasing so we could save additional space by
> only encoding the delta from a linear projection.
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