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

[Lukasz Antoniak (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-4787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=42124#action_42124 ] 

Lukasz Antoniak commented on HHH-4787:
--------------------------------------

Pull request submitted: https://github.com/hibernate/hibernate-core/pull/68

> AuditProperty.isNull() doesn't generate "tab.col is null" SQL clause as expected
> --------------------------------------------------------------------------------
>
>                 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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