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https://issues.apache.org/jira/browse/LUCENE-7839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16016628#comment-16016628
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Robert Muir commented on LUCENE-7839:
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Should this really be necessary given an iterator API? It seems too highly
specialized and fragile (just like what random access APIs were doing), versus
using a e.g. block-level compression like the posting lists.
> 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
>
> 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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