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https://issues.apache.org/jira/browse/LUCENE-8552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16683801#comment-16683801
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Christophe Bismuth edited comment on LUCENE-8552 at 11/15/18 8:42 AM:
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Is the underlying idea to limit the number of {{FieldInfo}} instances added to 
the {{FieldInfos.Builder}} for performances purpose?


was (Author: cbismuth):
Is the underlying idea to limit the number of {{FieldInfos}} instances added to 
the {{FieldInfos.Builder}} for performances purpose?

> 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
>            Priority: Minor
>
> 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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