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https://issues.apache.org/jira/browse/LUCENE-6068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14222437#comment-14222437
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Ryan Ernst commented on LUCENE-6068:
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+1, It's nice to remove useless code!
> Remove reader.fields() == null checks everywhere
> ------------------------------------------------
>
> Key: LUCENE-6068
> URL: https://issues.apache.org/jira/browse/LUCENE-6068
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Attachments: LUCENE-6068.patch
>
>
> I don't know how this got this way, but it never returns null. SegmentReader
> even asserts this. But the api requires consumers to do a bunch of useless
> null checks. This is a bug.
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