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https://issues.apache.org/jira/browse/SOLR-2072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13176277#comment-13176277
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Martijn van Groningen commented on SOLR-2072:
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Currently the AbstractFirstPassGroupingCollector uses the most relevant
document of a group to determine the order of a group in the result set. The
values for the most relevant document are either fetched from the score or
field cache (and possible also doc values in 4.x).
I think it is best to add more first pass grouping collectors, that use
different ways to order groups. Implementations could do this based on the
average group score or number of hits per group. I do think that these
implementations will be more expensive. Sorting by hit count or avg score
requires the collector to keep track of all groups. Currently
AbstractFirstPassGroupingCollector keeps only track of the top N groups.
> 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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