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https://issues.apache.org/jira/browse/LUCENE-4077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13285702#comment-13285702
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Christoph Kaser commented on LUCENE-4077:
-----------------------------------------
Hi Mike,
shouldn't TopGroups.maxScore contain the maximum parent score? If I am not
mistaken, the way it is built now, it contains the maximum child score over all
children.
This is due to this line in ToParentBlockJoinCollector.getTopGroups():
{code}
maxScore = Math.max(maxScore, topDocs.getMaxScore());
{code}
I think it should read:
{code}
totalMaxScore = Math.max(totalMaxScore, og.score);
{code}
Otherwise, topGroups.maxScore is different to
ToParentBlockJoinCollector.getMaxScore()
> ToParentBlockJoinCollector provides no way to access computed scores and the
> maxScore
> -------------------------------------------------------------------------------------
>
> Key: LUCENE-4077
> URL: https://issues.apache.org/jira/browse/LUCENE-4077
> Project: Lucene - Java
> Issue Type: Bug
> Components: modules/join
> Affects Versions: 3.4, 3.5, 3.6
> Reporter: Christoph Kaser
> Assignee: Michael McCandless
> Attachments: LUCENE-4077.patch, LUCENE-4077.patch, LUCENE-4077.patch
>
>
> The constructor of ToParentBlockJoinCollector allows to turn on the tracking
> of parent scores and the maximum parent score, however there is no way to
> access those scores because:
> * maxScore is a private field, and there is no getter
> * TopGroups / GroupDocs does not provide access to the scores for the parent
> documents, only the children
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