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https://issues.apache.org/jira/browse/LUCENE-6928?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand resolved LUCENE-6928.
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Resolution: Implemented
The Lucene70Codec has sparse norms already.
> Better deal with sparse norms
> -----------------------------
>
> Key: LUCENE-6928
> URL: https://issues.apache.org/jira/browse/LUCENE-6928
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
>
> Now that norms are disk-based (since 5.3) we're seeing similar issues as we
> were having with doc values in case of sparse fields. We could implement a
> similar approach to what was done in LUCENE-6863 in order to keep things fast
> in the dense case yet reduce disk requirements in the sparse case.
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