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https://issues.apache.org/jira/browse/LUCENE-6900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15013006#comment-15013006
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Martijn van Groningen commented on LUCENE-6900:
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No there isn't, what I remember is that when creating this class it was common
to use 'null' as an indication to sort by relevancy.
> Grouping sortWithinGroup should use Sort.RELEVANCE to indicate that, not null
> -----------------------------------------------------------------------------
>
> Key: LUCENE-6900
> URL: https://issues.apache.org/jira/browse/LUCENE-6900
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/grouping
> Reporter: David Smiley
> Priority: Minor
>
> In AbstractSecondPassGroupingCollector, {{withinGroupSort}} uses a value of
> null to indicate a relevance sort. I think it's nicer to use Sort.RELEVANCE
> for this -- after all it's how the {{groupSort}} variable is handled. This
> choice is also seen in GroupingSearch; likely some other collaborators too.
> [~martijn.v.groningen] is there some wisdom in the current choice that
> escapes me? If not I'll post a patch.
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