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https://issues.apache.org/jira/browse/LUCENE-7065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15179567#comment-15179567
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Adrien Grand commented on LUCENE-7065:
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Maybe the explanation descriptions should be more explicit: I think it could be
interesting to know that a document has no join value vs. it has one but it
does not match.
> Fix explain for global ordinal query time join
> ----------------------------------------------
>
> Key: LUCENE-7065
> URL: https://issues.apache.org/jira/browse/LUCENE-7065
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Martijn van Groningen
> Attachments: LUCENE_7065.patch
>
>
> The explain methods for the global ordinal join is broken, because even in
> the case that a document doesn't match with the query it tries to create an
> explain that tells it does.
> In the case when score mode 'avg' is used this causes a NPE and in the other
> cases the return explanation indicates that a document matches while it
> doesn't.
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