presto-hive/src/main/java/io/prestosql/plugin/hive/HiveMetadata.java/HiveMetadata/getCsvSerdeProperty
class HiveMetadata:    private static Optional<String> getCsvSerdeProperty(Table table, String key)
    {
        return getSerdeProperty(table, key).map(csvSerdeProperty -> {
            if (csvSerdeProperty.length() > 1) {
                throw new PrestoException(HIVE_INVALID_METADATA, "Only single character can be set for property: " + key);
            }
            return csvSerdeProperty;
        });
    }