presto-main/src/main/java/io/prestosql/sql/planner/planprinter/IoPlanPrinter.java/IoPlanPrinter/IoPlanPrinter
class IoPlanPrinter:    private IoPlanPrinter(Plan plan, Metadata metadata, Session session)
    {
        this.plan = requireNonNull(plan, "plan is null");
        this.metadata = requireNonNull(metadata, "metadata is null");
        this.session = requireNonNull(session, "session is null");
        this.valuePrinter = new ValuePrinter(metadata, session);
    }