presto-main/src/main/java/io/prestosql/sql/planner/planprinter/PlanPrinter.java/Visitor/visitOffset
class Visitor:        @Override
        public Void visitOffset(OffsetNode node, Void context)
        {
            addNode(node,
                    "Offset",
                    format("[%s]", node.getCount()));
            return processChildren(node, context);
        }