[hibernate-issues] [Hibernate-JIRA] Created: (HSEARCH-726) Facetted search on embedded collections takes only first element from collection

[Elmer van Chastelet (JIRA)]

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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