presto-main/src/main/java/io/prestosql/util/GraphvizPrinter.java/GraphvizPrinter/visitTableFinish
class GraphvizPrinter:        @Override
        public Void visitTableFinish(TableFinishNode node, Void context)
        {
            printNode(node, format("TableFinish[%s]", Joiner.on(", ").join(node.getOutputSymbols())), NODE_COLORS.get(NodeType.TABLE_FINISH));
            return node.getSource().accept(this, context);
        }