[hibernate-issues] [Hibernate-JIRA] Created: (HHH-3101) HQL "is not true" gets incorrectly changed into SQL "<>true"

[Gertjan van Oosten (JIRA)]

HQL "is not true" gets incorrectly changed into SQL "<>true"
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                 Key: HHH-3101
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3101
             Project: Hibernate3
          Issue Type: Bug
          Components: query-hql
    Affects Versions: 3.2.6, 3.2.5
         Environment: PostgreSQL
            Reporter: Gertjan van Oosten
            Priority: Minor


An HQL query with a where-clause on a boolean field like this:

  where boolValue is not true

[boolValue is of type boolean, possibly NULL]
which, according to the SQL:2003 standard and PostgreSQL's implementation thereof, means: select all rows that have a boolValue of either UNKNOWN (or NULL) or FALSE.
However, this HQL statement gets translated into SQL like this:

  where sometable0_.bool_value<>true

which is semantically different: select all rows that have a bool_value of FALSE, thus missing all rows where bool_value is UNKNOWN (or NULL).

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