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https://issues.apache.org/jira/browse/LUCENE-4540?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir resolved LUCENE-4540.
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Resolution: Fixed
> Allow packed ints norms
> -----------------------
>
> Key: LUCENE-4540
> URL: https://issues.apache.org/jira/browse/LUCENE-4540
> Project: Lucene - Core
> Issue Type: Task
> Components: core/index
> Reporter: Robert Muir
> Assignee: Robert Muir
> Fix For: 4.2, 5.0
>
> Attachments: LUCENE-4540.patch
>
>
> I was curious what the performance would be, because it might be useful
> option to use packedints for norms if you have lots of fields and still want
> good scoring:
> Today the smallest norm per-field-per-doc you can use is a single byte, and
> if you have _f_ fields with norms enabled and _n_ docs, it uses _f_ * _n_
> bytes of space in RAM.
> Especially if you aren't using index-time boosting (or even if you are, but
> not with ridiculous values), this could be wasting a ton of RAM.
> But then I noticed there was no clean way to allow you to do this in your
> Similarity: its a trivial patch.
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