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https://issues.apache.org/jira/browse/LUCENE-7475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15549558#comment-15549558
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Michael McCandless commented on LUCENE-7475:
--------------------------------------------
Woops, I just pushed a small speedup to the old norms format
({{Lucene43NormsProducer}}) to avoid the wrapper class (over dense norms)
before seeing this new issue :)
> Sparse norms
> ------------
>
> Key: LUCENE-7475
> URL: https://issues.apache.org/jira/browse/LUCENE-7475
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
> Fix For: master (7.0)
>
> Attachments: LUCENE-7475.patch
>
>
> Even though norms now have an iterator API, they are still always dense in
> practice since documents that do not have a value get assigned 0 as a norm
> value.
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