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https://issues.apache.org/jira/browse/LUCENE-2846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12976947#action_12976947
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Michael McCandless commented on LUCENE-2846:
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+1 for omitNorms to be viral.

> 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
>
> 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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