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Posted to dev@lucene.apache.org by "Martijn van Groningen (JIRA)" <ji...@apache.org> on 2011/06/13 22:14:51 UTC
[jira] [Updated] (LUCENE-3097) Post grouping faceting
[ https://issues.apache.org/jira/browse/LUCENE-3097?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Martijn van Groningen updated LUCENE-3097:
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Attachment: LUCENE-3097.patch
An updated version of the patch. This is still work in progress.
I basically rewrote the code in the same way as the other collectors were rewritten for LUCENE-3099.
Things todo are creating tests and add some more documentation. This patch only covers the second facet / grouping method.
> 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: 3.3
>
> Attachments: LUCENE-3097.patch, 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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