If I model an entity hierarchy using a single table and a discriminator column it appears I can't have the column mapped as a field in the base entity. At least Hibernate doesn't like it. Is that a JPA restriction (I couldn't find it in the spec) or a Hibernate special behaviour?
Assuming one cannot map a discriminator column because the values are all managed by the persistence runtime how do I write a JPA query against that column? Lets say we have entities A, B, C and D all extending entity X. Now I want a query saying give me all A's or B's (but not C's or D's) satisfying something based on common fields in X. I cannot query the discriminator column as it is not mapped. So how do I express the A's or B's condition?
Thanks
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