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From "Michael McCandless (JIRA)" <>
Subject [jira] Commented: (LUCENE-1604) Stop creating huge arrays to represent the absense of field norms
Date Tue, 14 Apr 2009 18:51:15 GMT


Michael McCandless commented on LUCENE-1604:

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:
>             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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