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https://issues.apache.org/jira/browse/SOLR-2072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13170549#comment-13170549
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George P. Stathis commented on SOLR-2072:
-----------------------------------------
Still not clear on where to start and probably stating the obvious for folks
familiar with the code: it looks like the assumption is made within
AbstractFirstPassGroupingCollector and AbstractSecondPassGroupingCollector
about using the highest scoring doc within each group. Perhaps using a
different TopScoreDocCollector and augmenting TopDocs to account for scoring
stats (e.g. sum of scores etc) might be a place to start. I'm getting warmer
here or completely off?
> Search Grouping: expand group sort options
> ------------------------------------------
>
> Key: SOLR-2072
> URL: https://issues.apache.org/jira/browse/SOLR-2072
> Project: Solr
> Issue Type: Sub-task
> Reporter: Yonik Seeley
>
> Ability to specify functions over group documents when sorting groups.
> max(score) or avg(popularity), etc.
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