presto-main/src/main/java/io/prestosql/sql/planner/planprinter/PlanPrinter.java/Visitor/visitDistinctLimit
class Visitor:        @Override
        public Void visitDistinctLimit(DistinctLimitNode node, Void context)
        {
            addNode(node,
                    format("DistinctLimit%s", node.isPartial() ? "Partial" : ""),
                    format("[%s]%s", node.getLimit(), formatHash(node.getHashSymbol())));
            return processChildren(node, context);
        }