[hibernate-issues] [Hibernate-JIRA] Commented: (HSEARCH-809) Make use of the new faceting API offered by Lucene

[Hardy Ferentschik (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=43666#comment-43666 ] 

Hardy Ferentschik commented on HSEARCH-809:
-------------------------------------------

some initial thoughts:

* need to include lucene-facet module 
* need to manage the new taxonomy index and make sure it is kept in sync with the actual index
* might want to expose access to the taxonomy index via an API (not really required though. would be a power user feature)
* current approach is agnostic of whether faceting is used. It uses the normal document fields. With Lucene's faceting approach we need to update the taxonomy index at indexing time. This means the user must somehow specify which fields are faceted under which facet path. Either we introduce a new annotation for that or we extend _ at Field_
* Lucene's faceting can support current Search faceting API, but can offer even more. We need to decide how much more we want to expose and how we expose it


> Make use of the new faceting API offered by Lucene
> --------------------------------------------------
>
>                 Key: HSEARCH-809
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-809
>             Project: Hibernate Search
>          Issue Type: Task
>          Components: engine
>    Affects Versions: 3.4.0.Final
>            Reporter: Hardy Ferentschik
>            Assignee: Hardy Ferentschik
>             Fix For: 4.0
>
>
> Instead of relying on the custom _FieldCache_ approach for faceting, we should make use of the API Lucene itself offers now. Or at least investigate how it is implemented in Lucene. Hopefully this will also address the problem that the _FieldCache_ approach. See also https://issues.apache.org/jira/browse/LUCENE-3079

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