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https://issues.apache.org/jira/browse/SOLR-2072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12916378#action_12916378
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Yonik Seeley commented on SOLR-2072:
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Right now, the sort value for a group (that governs how whole groups sort
relative to eachother) depends only on the top document in that group. This
issue is about a different type of function that can derive a group sort value
from something else. One example is being able to sort groups based on the
average score in that group rather than just the top score. Another example is
being able to sort by the number of hits in each group.
> 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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