def union_all(self, *q):
        return self._from_selectable(
            expression.union_all(*([self] + list(q)))
        )
Test if origin of link_or_copy'ed file is deleteable.
dataset/ETHPy150Open goFrendiAsgard/kokoropy/kokoropy/packages/sqlalchemy/orm/query.py/Query.union_all--crossover with--dataset/ETHPy150Open VisTrails/VisTrails/vistrails/core/system/linux.py/TestLinux.test3