[hibernate-issues] [Hibernate-JIRA] Commented: (HSEARCH-115) Add a default value for indexing null value

[Hardy Ferentschik (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=38970#action_38970 ] 

Hardy Ferentschik commented on HSEARCH-115:
-------------------------------------------

Nice one. I think that could work. I will go through the code to see if this approach would break down anywhere.

One thing we should think about as well is how we can expose the null token programmatically. To use this feature you will have to use the null token directly in your queries. This can lead to problems when you for example change the token in the annotation, but not in the matching query. I created HSEARCH-436 with this type of things in mind. I think it would be nice to be able to programmatically get metainformation about the configuration.

> Add a default value for indexing null value
> -------------------------------------------
>
>                 Key: HSEARCH-115
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-115
>             Project: Hibernate Search
>          Issue Type: Improvement
>          Components: mapping
>            Reporter: Julien Brulin
>            Assignee: Hardy Ferentschik
>             Fix For: 3.3.0
>
>
> Hi,
> Null elements are not indexed by lucene then it's not easy to use a nullable property in lucene query.
> I have a TagTranslation entity in my model with a nullable property language. In this case null is used as default language for tag translation.
> Each translation may have many variations like synonyms. 
> Because I can specified a default value for null value in the @Field annotation like this @Field(index=Index.UN_TOKENIZED, store=Store.NO, default='null'), i can't search a cat tag with a default translation like this : +value:cat* +lang:null 
> {code}
> @Entity()
> @Table(name="indexing_tag_trans")
> @org.hibernate.annotations.Cache(usage=org.hibernate.annotations.CacheConcurrencyStrategy.READ_WRITE)
> @Indexed
> public class TagTranslation implements java.io.Serializable {
>     private static final long serialVersionUID = -1065316566731456110L;
> 	
>     @Id
>     @GeneratedValue(strategy=GenerationType.IDENTITY)
>     @DocumentId
>     private Integer id;
>    
>     @Field(index=Index.UN_TOKENIZED, store=Store.NO)
>     private String language;
>     
>     @Field(index=Index.TOKENIZED, store=Store.YES)
>     private String value;
>     
>     @OneToMany(cascade=CascadeType.ALL, fetch=FetchType.LAZY)
>     @org.hibernate.annotations.Fetch(org.hibernate.annotations.FetchMode.SUBSELECT)
>     @JoinColumn(name="translation_id")
>     @IndexedEmbedded
>     private List<TagVariation> variations = new LinkedList<TagVariation>();
>   
>     public TagTranslation() { }
> ...
> {code}
> What do you think about that ?
> Ps: sorry for english write, i am a french guy.

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