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https://issues.apache.org/jira/browse/LUCENE-1604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12698869#action_12698869
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Earwin Burrfoot commented on LUCENE-1604:
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bq. There is also a [presumably smallish] performance hit by adding the "norms
!= null" check inside TermScorer, for every hit, but I think that's an OK
tradeoff.
If guys at Java HotSpot Compiler are doing their homework, checking something
!= null before accessing something should come almost for free, because each
access checks for null anyway.
> 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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