presto-main/src/main/java/io/prestosql/sql/planner/PlanFragmenter.java/PlanFragmenter/reassignPartitioningHandleIfNecessary
class PlanFragmenter:    private SubPlan reassignPartitioningHandleIfNecessary(Session session, SubPlan subPlan)
    {
        return reassignPartitioningHandleIfNecessaryHelper(session, subPlan, subPlan.getFragment().getPartitioning());
    }