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https://issues.apache.org/jira/browse/LUCENE-1604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12698839#action_12698839
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Shon Vella commented on LUCENE-1604:
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This is similar to LUCENE-505, but applies to all readers, not just MultiReader
and proposes a different, less complex solution. Attaching preliminary patch.
> 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
> 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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