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https://issues.apache.org/jira/browse/LUCENE-7081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15187199#comment-15187199
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Michael McCandless commented on LUCENE-7081:
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+1, nice!
> Docvalues terms dict should sometimes prefix-compress fixed-length data.
> ------------------------------------------------------------------------
>
> Key: LUCENE-7081
> URL: https://issues.apache.org/jira/browse/LUCENE-7081
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Robert Muir
> Attachments: LUCENE-7081.patch
>
>
> For Sorted/SortedSet types, we encode ordinals and a term dictionary (similar
> to old lucene 3 term dictionary).
> Originally we had no prefix compression, so we "save space" in the
> fixed-width case by avoiding addressing, we can just use multiplication:
> https://github.com/apache/lucene-solr/blob/master/lucene/core/src/java/org/apache/lucene/codecs/lucene54/Lucene54DocValuesConsumer.java#L423-L425
>
> But it means no compression whatsoever of the actual bytes, even if values
> are enormous, I don't think its necessarily a good tradeoff. The lack of
> prefix compression can become much more magnified now that we have fixed
> width 128-bit point types in the sandbox...
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