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https://issues.apache.org/jira/browse/LUCENE-2846?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir updated LUCENE-2846:
--------------------------------

    Attachment: LUCENE-2846.patch

here's an updated patch:
* The IR.setNorm(float) is also removed, forcing the user to use the correct 
similarity versus us using the wrong one (the static)
* MultiNorms doesn't fake norms anymore, instead it handles the case of 
non-existent field versus omitted norms.
* When a document doesnt have a field, its (undefined) norms are written as 
zero bytes instead of Similarity.getDefault().encodeNorm(1f). 
* All uses of Similarity.get/setDefault are now gone in lucene core, except for 
in IndexSearcher and IndexWriterConfig.


> omitTF is viral, but omitNorms is anti-viral.
> ---------------------------------------------
>
>                 Key: LUCENE-2846
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2846
>             Project: Lucene - Java
>          Issue Type: Improvement
>            Reporter: Robert Muir
>             Fix For: 4.0
>
>         Attachments: LUCENE-2846.patch, LUCENE-2846.patch
>
>
> omitTF is viral. if you add document 1 with field "foo" as omitTF, then 
> document 2 has field "foo" without omitTF, they are both treated as omitTF.
> but omitNorms is the opposite. if you have a million documents with field 
> "foo" with omitNorms, then you add just one document without omitting norms, 
> now you suddenly have a million 'real norms'.
> I think it would be good for omitNorms to be viral too, just for consistency, 
> and also to prevent huge byte[]'s.
> but another option is to make omitTF anti-viral, which is more "schemaless" i 
> guess.

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