Github user MaxGekk commented on the issue:

    https://github.com/apache/spark/pull/22429
  
    > Could you also try to remove the default value?
    
    I have removed the default value `None` but still keep type as 
`Option[Int]`. @zsxwing Is it ok?
    
    > org.apache.spark.util.Utils.truncatedString seems in a wrong project. ... 
Could you move it to the catalyst project. 
    
    Moved to `catalyst`.
    
    > In addition, it would be great that you can change it to a SQL conf so 
that we can modify this config dynamically.
    
    Do you mean moving the `spark.debug.maxToStringFields` to `SQLConf` or 
adding another SQL config like `spark.sql.maxFieldsInTruncatedString`?


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