Minor Description
In the udf 'mask', using -1 as ignore parameter in String type argument is not a standard way, hence, it is better to change the value of ignore argument from -1 to NULL.
Note: SPARK-40687 , has recently implemented udf mask , which uses -1 as the default argument to ignore the masking option, As no Spark version release has occurred since then, this new change will not cause backward compatibility issues
