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https://issues.apache.org/jira/browse/SOLR-3406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13261030#comment-13261030
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Martijn van Groningen commented on SOLR-3406:
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bq. I just realized that computing stats on an ungrouped docset still wouldn't
work since I still need to do query facets on price ranges.
I don't follow this completely. If you use query or range facets this just
should work, right? Or are you using group.facet or group.truncate in the same
request?
bq. Have you started on GroupedFacets?
Nope. I created group facet collector in the Lucene grouping module which is
used by Solr in the SimpleFacets.
If I remember correctly both query facets and range facets in Solr are queries
being executed on a top level searcher. For each queries a count is computed
(based on the facet and main query result) and put in the response. For range
facets multiple queries are executed based on the start, end and gap. I think
grouped variant just needs to compute a grouped count for each query being
executed. There are already collectors in the grouping module that compute a
grouped count for a query.
The only thing I'm worried about is caching. For each query or range facet a
docset is computed and this stored in the filter cache and possible used for
future requests. This docset is intersected with the docset matching with the
main query, which result in the count being used in the response. We would need
to do something similar.
> Support grouped range and query facets.
> ---------------------------------------
>
> Key: SOLR-3406
> URL: https://issues.apache.org/jira/browse/SOLR-3406
> Project: Solr
> Issue Type: New Feature
> Reporter: David
> Priority: Critical
> Fix For: 4.0
>
> Original Estimate: 504h
> Remaining Estimate: 504h
>
> Need the ability to support grouped range and query facets. Grouped facet
> fields have already been implemented in SOLR-2898 but we still need the
> ability to compute grouped range and query facets.
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