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Is it possible to use casts in JPQL? In HQL it seems to be supported
cast(… as …), where the second
argument is the name of a Hibernate
type, and extract(… from …) if
ANSI cast() and extract() is supported
by the underlying database
source : Hibernate reference
My target JPA provider is EclipseLink, so any EclipseLink specific solution is ok as well.
Literal downcasts in EclipseLink JPQL are currently not supported, but might be if the following issue gets resolved : https://bugs.eclipse.org/bugs/show_bug.cgi?id=315087