[hibernate-issues] [Hibernate-JIRA] Created: (HHH-4069) DetachedCriteria with Projections generates invalid SQL when using inheritance with PostgreSQL

[Gajo Csaba (JIRA)]

DetachedCriteria with Projections generates invalid SQL when using inheritance with PostgreSQL
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                 Key: HHH-4069
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4069
             Project: Hibernate Core
          Issue Type: Bug
          Components: query-criteria
    Affects Versions: 3.2.6
         Environment: Hibernate 3.2.6 GA with annotations, PostgreSQL 8.3, Ubuntu Linux
            Reporter: Gajo Csaba
         Attachments: postgretest.zip

PostgreSQL doesn't allow using aliases in the WHERE clause. For example, the following query is invalid:
SELECT it.id_item as aaa FROM Item it WHERE aaa=1
The correct query would be:
SELECT it.id_item as aaa FROM Item it WHERE it.id_item=1

When having inheritance with a TABLE_PER_CLASS strategy, the HSQL query "select idItem from Item where idItem=:idItem" will generate the correct query. However, doing the same with a DetachedCriteria will generate the invalid query.  Note that I'm not selecting everything from Item. It's not select *. I'm only selecting idItem, which means in the DetachedCriteria I'm using Projections. Without projections, the generated query works fine.

I've attached a test case, and the following is a short explanation:

model.Item - abstract superclass
model.Product - extends Item
model.Project - extends Item

Main is the main class. Removing the following piece of code will make the test case work without errors:

criteria.setProjection(Projections.projectionList()
			.add(Projections.property("idItem"), "idItem")
			.add(Projections.property("name"), "name"));

The test case may be compiled with Maven.


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