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From "Thomas Mueller (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-1367) H2 Database Engine does support cross join
Date Fri, 30 Oct 2009 13:00:59 GMT
H2 Database Engine does support cross join
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                 Key: OPENJPA-1367
                 URL: https://issues.apache.org/jira/browse/OPENJPA-1367
             Project: OpenJPA
          Issue Type: Bug
          Components: docs, jpa
    Affects Versions: 2.0.0-M1, 1.2.1
            Reporter: Thomas Mueller
            Priority: Minor


The documentation says that the H2 database does not support cross joins:

http://openjpa.apache.org/builds/1.2.1/apache-openjpa-1.2.1/docs/manual/dbsupport_h2.html
http://openjpa.apache.org/builds/2.0.0-M3/apache-openjpa-2.0.0-M3/docs/manual/main.html

H2 does support cross join since a long time (I don't remember what version). See: http://www.h2database.com/html/grammar.html#table_expression
(CROSS). A condition is not required for cross join.

I think the documentation should be changed, and probably the H2Dictionary should be changed
as well (crossJoinClause = "CROSS JOIN"; requiresConditionForCrossJoin = false;).




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