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https://issues.apache.org/jira/browse/LUCENE-4643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13546017#comment-13546017
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Adrien Grand commented on LUCENE-4643:
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bq. actually i'm confused why we need it at all, since we are writing only
positive numbers (deltas from minValue, which itself is the only one that need
be negative).
Oh! I think we misunderstood. The first patch uses zig-zag encoding for
minValue only and the 2nd patch requires people to zig-zag encode before
feeding the writer.
> PackedInts: convenience classes to write blocks of packed ints
> --------------------------------------------------------------
>
> Key: LUCENE-4643
> URL: https://issues.apache.org/jira/browse/LUCENE-4643
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-4643.patch, LUCENE-4643.patch
>
>
> It is often useful to divide a packed stream into fixed blocks which are all
> compressed independently:
> * if your sequence of ints is very large, you won't have to buffer
> everything into memory to compute the required number of bits per value,
> * the compression ratio will be better in case of rare extreme values.
> The only drawback compared to the original PackedInts API is that the stream
> cannot be directly used to deserialize a random-access PackedInts.Reader (but
> for sequential access, this is just fine).
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