rzo1 opened a new pull request, #189:
URL: https://github.com/apache/openjpa/pull/189

   The TREAT discriminator filter only matched the exact treated class (`disc = 
value`), so `TREAT(x AS Middle)` dropped instances of Middle's subclasses. It 
now reuses the discriminator's class conditions, like `InstanceofExpression`, 
which emit `IN (...)` over the treated class and its subclasses. Note that for 
`LEFT JOIN TREAT(...)` rows without a related entity are now kept (`disc IS 
NULL OR ...`); `TestTreatSubclassDiscriminator` covers a three-level 
single-table hierarchy.


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