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https://issues.apache.org/jira/browse/LUCENE-7839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16023248#comment-16023248
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Robert Muir commented on LUCENE-7839:
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OK, i will try to look at the patch. I'm not sure its necessary to do delta
compression (max-min) in this case, in case it makes things simpler.
> Optimize the default NormsFormat for the case that all norms are in 0..16
> -------------------------------------------------------------------------
>
> Key: LUCENE-7839
> URL: https://issues.apache.org/jira/browse/LUCENE-7839
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-7839.patch
>
>
> Given how we now store the length of the field in norms, we could optimize
> the default norms format for the case that all norms are in 0..16 and store
> it on 4 bits. This would be picked up for short fields that have less than 16
> terms (eg. title fields) and reduce disk utilization by 2.
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