SubQuery with Exists generates invalid SQL
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                 Key: OPENJPA-728
                 URL: https://issues.apache.org/jira/browse/OPENJPA-728
             Project: OpenJPA
          Issue Type: Bug
          Components: query
    Affects Versions: 1.2.0, 1.1.0, 1.0.3, 1.0.2
         Environment: Windows XP, JDK 1.6.0_07, Derby and HSQL.
            Reporter: Bjorn Beskow
            Priority: Critical


When using a subquery containing EXISTS, the generated SQL contains table 
aliases that does not exist in the select statement. For example, the following 
query:

      SELECT new test.dto.EmployeeReportDTO(e.name, a.city)
      FROM Employee e JOIN e.address a 
      WHERE e.name LIKE :name
      AND EXISTS (SELECT p.number from PhoneNumber p WHERE p.owner = e)

Column not found: T3.CITY in statement [SELECT t0.name, t3.city FROM Employee 
t0 INNER JOIN Address t1 ON t0.address_id = t1.id WHERE (t0.name LIKE ? ESCAPE 
'\' AND NOT (EXISTS (SELECT t2.number FROM Address t1, PhoneNumber t2 WHERE 
(t2.owner_id = t0.id))))]


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