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https://issues.apache.org/jira/browse/LUCENE-1604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12699720#action_12699720
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Michael McCandless commented on LUCENE-1604:
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bq. Setting disableFakeNorms transitively isn't really needed because
MultiSegmentReader doesn't make any calls to the subreaders that would cause it
to create it's own fake norms
But since we score per-segment, TermScorer would ask each SegmentReader (in the
MultiSegmentReader) for its norms? So I think the sub readers need to know the
setting.
bq. Any thoughts on whether we need this or not?
I think we do need each class implementing clone() and reopen() to properly
carryover this setting.
> 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, 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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