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https://issues.apache.org/jira/browse/LUCENE-3097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13033939#comment-13033939
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Michael McCandless commented on LUCENE-3097:
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Thanks for the example Bill -- that makes sense!
I think, in general, the post-group faceting should act "as if" you had indexed
a single document per group, with multi-valued fields containing the union of
all field values within that group, and then done "normal" faceting. I believe
this defines the semantics we are after for post-grouping faceting.
> Post grouping faceting
> ----------------------
>
> Key: LUCENE-3097
> URL: https://issues.apache.org/jira/browse/LUCENE-3097
> Project: Lucene - Java
> Issue Type: New Feature
> Reporter: Martijn van Groningen
> Priority: Minor
> Fix For: 3.2, 4.0
>
>
> 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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