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https://issues.apache.org/jira/browse/LUCENE-8104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16296426#comment-16296426
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Alan Woodward commented on LUCENE-8104:
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LUCENE-7889 is a start at implementing this.
Removing ValueSource entirely would be great, but it's heavily used within
Solr. Would you want to just move the classes into the Solr subproject, or try
and rework things so that Solr uses DoubleValuesSource instead?
> Grouping module should no longer depend on Queries module (ValueSource)
> -----------------------------------------------------------------------
>
> Key: LUCENE-8104
> URL: https://issues.apache.org/jira/browse/LUCENE-8104
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/grouping
> Reporter: David Smiley
>
> The Grouping module depends on the Queries module in GroupingSearch /
> ValueSourceGroupSelector to use the ValueSource framework. It should instead
> use the newer DoubleValueSource or LongValueSource framework in Core. As I
> write this, this appears to be the last part of Lucene to refer to the
> ValueSource framework, and I think we should then remove it -- for another
> issue of course.
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