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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3097) Post grouping faceting
Date Fri, 27 May 2011 16:10:48 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13040304#comment-13040304
] 

Michael McCandless commented on LUCENE-3097:
--------------------------------------------

Right, I think for post-grouping facet counts, the facet counting
process must be aware of the groups.  Within each group, it can only
count each value (color=red, size=S) once...


> 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: 3.2, 4.0
>
>         Attachments: LUCENE-3097.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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