presto-parser/src/main/java/io/prestosql/sql/ExpressionFormatter.java/ExpressionFormatter/visitRowField
class ExpressionFormatter:        @Override
        protected String visitRowField(RowDataType.Field node, Void context)
        {
            StringBuilder result = new StringBuilder();

            if (node.getName().isPresent()) {
                result.append(process(node.getName().get(), context));
                result.append(" ");
            }

            result.append(process(node.getType(), context));

            return result.toString();
        }