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https://issues.apache.org/jira/browse/SOLR-2553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13040838#comment-13040838
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Michael McCandless commented on SOLR-2553:
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The CachingCollector should reduce the search cost, since it can replay a 2nd
time for the nested group collection.
We have to somehow open up the SecondPassGroupingCollector -- today it
forcefully creates collectors specific to sort by score or field.
> Nested Field Collapsing
> -----------------------
>
> Key: SOLR-2553
> URL: https://issues.apache.org/jira/browse/SOLR-2553
> Project: Solr
> Issue Type: Improvement
> Components: SearchComponents - other
> Reporter: Martijn Laarman
>
> Currently specifying grouping on multiple fields returns multiple datasets.
> It would be nice if Solr supported cascading / nested grouping by applying
> the first group over the entire result set, the next over each group and so
> forth and so forth.
> Even if limited to supporting nesting grouping 2 levels deep would cover alot
> of use cases.
> group.field=location&group.field=type
> -Location X
> ---Type 1
> -----documents
> ---Type 2
> ----documents
> -Location Y
> ---Type 1
> ----documents
> ---Type 2
> ----documents
> instead of
> -Location X
> -- documents
> -Location Y
> --documents
> -Type 1
> --documents
> -Type2
> --documents
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