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https://issues.apache.org/jira/browse/LUCENE-2872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12984306#action_12984306
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Robert Muir commented on LUCENE-2872:
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+1 to commit, the last specialization made all the difference on my benchmarks.
I think this will pave the way for us to fix Sep codec in the branch...
> Terms dict should block-encode terms
> ------------------------------------
>
> Key: LUCENE-2872
> URL: https://issues.apache.org/jira/browse/LUCENE-2872
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 4.0
>
> Attachments: LUCENE-2872.patch, LUCENE-2872.patch, LUCENE-2872.patch
>
>
> With PrefixCodedTermsReader/Writer we now encode each term standalone,
> ie its bytes, metadata, details for postings (frq/prox file pointers),
> etc.
> But, this is costly when something wants to visit many terms but pull
> metadata for only few (eg respelling, certain MTQs). This is
> particularly costly for sep codec because it has more metadata to
> store, per term.
> So instead I think we should block-encode all terms between indexed
> term, so that the metadata is stored "column stride" instead. This
> makes it faster to enum just terms.
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