[hibernate-issues] [Hibernate-JIRA] Created: (HHH-5503) HSQLDialect uses invalid select-clause null string for BLOB on HSQLDB 2.0

[Bart Bakker (JIRA)]

HSQLDialect uses invalid select-clause null string for BLOB on HSQLDB 2.0
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                 Key: HHH-5503
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5503
             Project: Hibernate Core
          Issue Type: Bug
          Components: query-sql
    Affects Versions: 3.5.5, 3.5.4
         Environment: HSQLDB 2.0
            Reporter: Bart Bakker


The union select statement that is generated for multiple subclasses of an entity, when one of the subclasses uses a Lob, contains an invalid cast null on HSQLDB 2.0.

>From version 2.0 on HSQLDB supports data type BLOB and no longer forces using longvarbinary for blobs. While the HSQLDialect registers the appropriate column type for LOB now, it uses "cast(null as int)" in its getSelectClauseNullString in the union select described above, which causes HSQLDB error 'incompatible data types in combination'.


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