presto-main/src/main/java/io/prestosql/sql/planner/planprinter/IoPlanPrinter.java/IoPlanPrinter/IoPlanBuilder
class IoPlanPrinter:            private IoPlanBuilder(Plan plan)
            {
                this.plan = plan;
                this.inputTableColumnInfos = new HashSet<>();
                this.outputTable = Optional.empty();
            }