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A query like select key(c).id from Entity e join e.map c will fail with a ClassCastException because we return the "wrong" model part from the EntityCollectionPart that represents key(c).
select key(c).id from Entity e join e.map c
ClassCastException
EntityCollectionPart
key(c)
A query like
select key(c).id from Entity e join e.map cwill fail with aClassCastExceptionbecause we return the "wrong" model part from theEntityCollectionPartthat representskey(c).