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https://issues.apache.org/jira/browse/LUCENE-1604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12698874#action_12698874
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Michael McCandless commented on LUCENE-1604:
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bq. ferreting out all the tests that need to be duplicated with it on and with 
it off could get very tedious.

I don't think you need to dup all tests w/ on & off.  If you can get Lucene's 
tests to pass when [temporarily] hardwiring it to on (ie, allowed to return 
null), I think that's fine?  Then, for the duration up until 2.9, we're testing 
the "off" case, and when we flip it in 3.0, we're testing the "on" case.

> Stop creating huge arrays to represent the absense of field norms
> -----------------------------------------------------------------
>
>                 Key: LUCENE-1604
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1604
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>    Affects Versions: 2.9
>            Reporter: Shon Vella
>            Priority: Minor
>             Fix For: 2.9
>
>         Attachments: LUCENE-1604.patch
>
>
> Creating and keeping around huge arrays that hold a constant value is very 
> inefficient both from a heap usage standpoint and from a localility of 
> reference standpoint. It would be much more efficient to use null to 
> represent a missing norms table.

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