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https://issues.apache.org/jira/browse/LUCENE-6668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14634660#comment-14634660
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ASF subversion and git services commented on LUCENE-6668:
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Commit 1692058 from [~jpountz] in branch 'dev/trunk'
[ https://svn.apache.org/r1692058 ]
LUCENE-6668: Added table encoding to sorted set/numeric doc values.
> Optimize SortedSet/SortedNumeric storage for the few unique sets use-case
> -------------------------------------------------------------------------
>
> Key: LUCENE-6668
> URL: https://issues.apache.org/jira/browse/LUCENE-6668
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-6668.patch, LUCENE-6668.patch
>
>
> Robert suggested this idea: if there are few unique sets of values, we could
> build a lookup table and then map each doc to an ord in this table, just like
> we already do for table compression for numerics.
> I think this is especially compelling given that SortedSet/SortedNumeric are
> our two only doc values types that use O(maxDoc) memory because of the
> offsets map. When this new strategy is used, memory usage could be bounded to
> a constant.
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