Facetted search on embedded collections takes only first element from collection
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Key: HSEARCH-726
URL:
http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-726
Project: Hibernate Search
Issue Type: Bug
Components: query
Affects Versions: 3.4.0.CR2, 3.4.0.CR1, 3.4.0.Beta1, 3.4.0.Alpha1
Environment: Any valid config I suppose, tested using Hibernate Core 3.6.3 +
Search 3.4.0.CR2, mysql and in Hibernate Search test environment
Reporter: Elmer van Chastelet
Attachments: EmbeddedCollectionsFacetsTest.zip
From [Hibernate Search Forum: Bug or not? Faceted search + embedded
fields (*tomany)|https://forum.hibernate.org/viewtopic.php?f=9&t=1010472&start=0].
Faceted search won't work correctly when used on collections. For the cause I
quote Hardy Ferentschik : ??The current faceting implementation utilizes the Lucene
FieldCache which has a limitation that each document must have a single value for the
specified field.??
I can think of many use cases in which faceted search on collections is really needed,
some examples:
Facetting on authors when searching for publications
Facetting on ingredients when searching for recipes
Facetting on actors when searching for movies
...
Attached is a hibernate search test case. It fails on retrieving the right amount of
matched authors.
Currently I don't have the needed insight to suggest an improvement on current
implementation to make it compatible with collections. Hopefully it can be achieved with
small changes. Good luck :)
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