presto-parser/src/main/java/io/prestosql/sql/SqlFormatter.java/SqlFormatter/visitCall
class SqlFormatter:        @Override
        protected Void visitCall(Call node, Integer indent)
        {
            builder.append("CALL ")
                    .append(node.getName())
                    .append("(");

            Iterator<CallArgument> arguments = node.getArguments().iterator();
            while (arguments.hasNext()) {
                process(arguments.next(), indent);
                if (arguments.hasNext()) {
                    builder.append(", ");
                }
            }

            builder.append(")");

            return null;
        }