[hibernate-issues] [Hibernate-JIRA] Created: (HHH-5120) LazyGroup Loading Mechanism

[Demidovich Artem (JIRA)]

LazyGroup Loading Mechanism
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                 Key: HHH-5120
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5120
             Project: Hibernate Core
          Issue Type: Improvement
          Components: core
         Environment: Hibernate
            Reporter: Demidovich Artem
            Priority: Minor


I would like to suggest a new functionality, which could improve Lazy loading. For Example, I have bussines objects and there is an object named Company. 
Company has many fields, but I can separate Company fields in two or three logical groups and those fields of the object can be groupped in LazyGroups (for example "LazyGroup1", "LazyGroup2"). Now if caller tries to get some field from the LazyGroup1 then Nibernate will load all fields from this group.

Just for example

 Company             Type              LazyGroup

 1. Name             (string)
 2. Postal Code      (string)
 3. Address          (Address Object)
 4. Wokers           (Lazy Collection) 
 5. Contracts        (Lazy Collection) (LazyGroup = 'LG1')
 6. Clients          (Lazy Collection) (LazyGroup = 'LG1')
 7. BussinesInfo     (string)          (LazyGroup = 'LG2')
 8. BussinesRegions  (Lazy Collection) (LazyGroup = 'LG2')
 8. BussinesPartners (Lazy Collection) (LazyGroup = 'LG2')

So, if I call BussinesInfo getter then Hibernate should load all fields in 'LG2' LazyGroup (BussinussInfo, BussinessRegions, BussinesPartners).

This improvement will descrease amount of sql queries, because hibernate will use one query for loading all fields from the lazy group rather than calling one query per field.

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