Brett Meyer commented on an issue
Hibernate ORM / Bug HHH-8614
Antlr exception while parsing correct HQL
This code: ...createQuery("delete from MyEntity").executeUpdate();

produces antlr.NoViableAltException in log (see attachment) however the functionality works.

It works correctly when adding a "where" clause:
...createQuery("delete from MyEntity where 1 = 1").executeUpdate();