presto-main/src/main/java/io/prestosql/sql/planner/QueryPlanner.java/QueryPlanner/planImplicitTable
class QueryPlanner:    private RelationPlan planImplicitTable()
    {
        List<Expression> emptyRow = ImmutableList.of();
        Scope scope = Scope.create();
        return new RelationPlan(
                new ValuesNode(idAllocator.getNextId(), ImmutableList.of(), ImmutableList.of(emptyRow)),
                scope,
                ImmutableList.of());
    }