[hibernate-issues] [Hibernate-JIRA] Resolved: (HSEARCH-154) Provide a facility to access Lucene query explanations

[Emmanuel Bernard (JIRA)]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-154?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Emmanuel Bernard resolved HSEARCH-154.
--------------------------------------

       Resolution: Fixed
    Fix Version/s: 3.1.0.Beta1

Add 
fullTextQuery.explain(int);
and 
fullTextQuery.setProjection(FullTextQuery.EXPLANATION)

The second shoud be used only if small amount of data is retrieved.

> Provide a facility to access Lucene query explanations
> ------------------------------------------------------
>
>                 Key: HSEARCH-154
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-154
>             Project: Hibernate Search
>          Issue Type: New Feature
>          Components: query
>    Affects Versions: 3.0.0.GA
>         Environment: Hibernate 3.2
>            Reporter: Nick Vincent
>            Priority: Minor
>             Fix For: 3.1.0.Beta1
>
>         Attachments: explainpatch.txt
>
>
> Hibernate search should provide a facility where it is possible access the Lucene explanation for a Hit object. I've attached a patch that allows it to do this.
> I've implemented this only at the FullTextQueryImpl level such that it does not appear in the public API as it seems rather Lucene specific to include in the FullTextQuery interface.
> Using this patch it is possible to access the explanation for a document by casting FullTextQuery to its implementation class.
> It is also necessary to be able to discover the internal Lucene document id for a document in order to be able to request an Explanation object.  I've added this to the projection constants and modified DocumentExtractor to utilise it.

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