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https://issues.apache.org/jira/browse/LUCENE-8552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16690466#comment-16690466
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Christophe Bismuth commented on LUCENE-8552:
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Thank you for your help [~dsmiley] (y)
> optimize getMergedFieldInfos for one-segment FieldInfos
> -------------------------------------------------------
>
> Key: LUCENE-8552
> URL: https://issues.apache.org/jira/browse/LUCENE-8552
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: David Smiley
> Assignee: David Smiley
> Priority: Minor
> Fix For: 7.7
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> FieldInfos.getMergedFieldInfos could trivially return the FieldInfos of the
> first and only LeafReader if there is only one LeafReader.
> Also... if there is more than one LeafReader, and if FieldInfos & FieldInfo
> implemented equals() & hashCode() (including a cached hashCode), maybe we
> could also call equals() iterating through the FieldInfos to see if we should
> bother adding it to the FieldInfos.Builder? Admittedly this is speculative;
> may not be worth the bother.
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