presto-main/src/main/java/io/prestosql/util/GraphvizPrinter.java/GraphvizPrinter/visitRowNumber
class GraphvizPrinter:        @Override
        public Void visitRowNumber(RowNumberNode node, Void context)
        {
            printNode(node,
                    "RowNumber",
                    format("partition by = %s", Joiner.on(", ").join(node.getPartitionBy())),
                    NODE_COLORS.get(NodeType.WINDOW));
            return node.getSource().accept(this, context);
        }