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https://issues.apache.org/jira/browse/LUCENE-7206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15291119#comment-15291119
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Ilya Kasnacheev commented on LUCENE-7206:
-----------------------------------------

NB: It should perhaps be

childWeight.explain(context, childDoc - context.docBase);

in the original patch in order for this to work over multiple segments.

> nest child query explain into 
> ToParentBlockJoinQuery.BlockJoinScorer.explain(int)
> ---------------------------------------------------------------------------------
>
>                 Key: LUCENE-7206
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7206
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/query/scoring
>    Affects Versions: 6.0
>            Reporter: Mikhail Khludnev
>              Labels: newbie, newdev
>         Attachments: LUCENE-7206-test.patch, LUCENE-7206.diff
>
>
> Now to parent query match is explained with {{Score based on child doc range 
> from .. to .. }} that's quite useless. 
> It's proposed to nest child query match explanation from the first matching 
> child document into parent explain. 
> WDYT?



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