public Integer getAdditionalTTL() {
        return additionalTTL;
    }
Returns the additional time to live (TTL) if data type is {@link RedisDataType#HASH}.

@return the additional TTL
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/redis/src/main/java/org/apache/inlong/sort/redis/common/mapper/RedisCommandDescription.java