presto-main/src/main/java/io/prestosql/util/GraphvizPrinter.java/NodePrinter/visitTableScan
class NodePrinter:        @Override
        public Void visitTableScan(TableScanNode node, Void context)
        {
            printNode(node, format("TableScan[%s]", node.getTable()), NODE_COLORS.get(NodeType.TABLESCAN));
            return null;
        }