[hibernate-issues] [Hibernate-JIRA] Created: (HHH-4787) AuditProperty.isNull() doesn't generate "tab.col is null" SQL clause as expected

[Eric Citaire (JIRA)]

AuditProperty.isNull() doesn't generate "tab.col is null" SQL clause as expected
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                 Key: HHH-4787
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4787
             Project: Hibernate Core
          Issue Type: Bug
          Components: envers
    Affects Versions: 3.3.0.GA
         Environment: Hibernate 3.3.0.GA, Envers 1.2.2, HSQLDB Database
            Reporter: Eric Citaire
            Priority: Critical


AuditProperty.isNull() generate a SQL condition like this :
"tab.col=?"
where the bind variable is mapped to a null value.

This doesn't work : most database engines will return false in every case.

It should use the "is null" test instead :
"tab.col is null"

http://en.wikipedia.org/wiki/SQL#Null_and_Three-Valued_Logic_.283VL.29

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