Post grouping faceting
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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 2 for both airports or 1 for both airports.
This issue is blocked by LUCENE-3079.
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