presto-main/src/main/java/io/prestosql/sql/planner/QueryPlanner.java/QueryPlanner/planBuilderFor
class QueryPlanner:    private PlanBuilder planBuilderFor(PlanBuilder builder, Scope scope)
    {
        return planBuilderFor(new RelationPlan(builder.getRoot(), scope, builder.getRoot().getOutputSymbols()));
    }