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https://issues.apache.org/jira/browse/LUCENE-3097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13149006#comment-13149006
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Martijn van Groningen commented on LUCENE-3097:
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Well the code that got committed only creates facets for the most relevant
document per group. This isn't really grouped facets. To implement this we need
to modify Solr's faceting code / facet module code. So I think we can close
this one and open a Solr issue to implement grouped facets in Solr (I do have
some code for this, but it isn't perfect...) and maybe also an issue to add
this to the faceting module
> Post grouping faceting
> ----------------------
>
> Key: LUCENE-3097
> URL: https://issues.apache.org/jira/browse/LUCENE-3097
> Project: Lucene - Java
> Issue Type: New Feature
> Components: modules/grouping
> Reporter: Martijn van Groningen
> Assignee: Martijn van Groningen
> Priority: Minor
> Fix For: 3.5, 4.0
>
> Attachments: LUCENE-3097.patch, LUCENE-3097.patch, LUCENE-3097.patch,
> LUCENE-3097.patch, LUCENE-3097.patch, LUCENE-30971.patch
>
>
> This issues focuses on implementing post grouping faceting.
> * How to handle multivalued fields. What field value to show with the facet.
> * Where the facet counts should be based on
> ** Facet counts can be based on the normal documents. Ungrouped counts.
> ** Facet counts can be based on the groups. Grouped counts.
> ** Facet counts can be based on the combination of group value and facet
> value. Matrix counts.
> And properly more implementation options.
> The first two methods are implemented in the SOLR-236 patch. For the first
> option it calculates a DocSet based on the individual documents from the
> query result. For the second option it calculates a DocSet for all the most
> relevant documents of a group. Once the DocSet is computed the FacetComponent
> and StatsComponent use one the DocSet to create facets and statistics.
> This last one is a bit more complex. I think it is best explained with an
> example. Lets say we search on travel offers:
> |||hotel||departure_airport||duration||
> |Hotel a|AMS|5
> |Hotel a|DUS|10
> |Hotel b|AMS|5
> |Hotel b|AMS|10
> If we group by hotel and have a facet for airport. Most end users expect
> (according to my experience off course) the following airport facet:
> AMS: 2
> DUS: 1
> The above result can't be achieved by the first two methods. You either get
> counts AMS:3 and DUS:1 or 1 for both airports.
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