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https://issues.apache.org/jira/browse/LUCENE-4527?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13490179#comment-13490179
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Robert Muir commented on LUCENE-4527:
-------------------------------------
And of course for this test (and any other test of compressing stored fields),
that
"fake" wikipedia corpus being used is totally invalid because all documents are
truncated to a specific length :)
> CompressingStoredFieldsFormat: encode numStoredFields more efficiently
> ----------------------------------------------------------------------
>
> Key: LUCENE-4527
> URL: https://issues.apache.org/jira/browse/LUCENE-4527
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Fix For: 4.1
>
> Attachments: LUCENE-4527.patch
>
>
> Another interesting idea from Robert: many applications have a schema and all
> documents are likely to have the same number of stored fields. We could save
> space by using packed ints and the same kind of optimization as {{ForUtil}}
> (requiring only one VInt if all values are equal).
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