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DiscriminatorStrategy.getClassConditions() method return null for no conditions so that we can detect whether the joins to the base class owning the discriminator are necessary before making them. Otherwise, we run the risk of creating table aliases for base class tables without joining them, which can result in bad SQL. git-svn-id: https://svn.apache.org/repos/asf/incubator/openjpa/trunk@505017 13f79535-47bb-0310-9956-ffa450edef68