Github user barrenlake commented on the issue:

    https://github.com/apache/spark/pull/20975
  
    @HyukjinKwon  Hello, the unit test describes the scene where this problem 
occurred. You can run the unit test in the original system. Spark2.3 introduced 
`wholetext` ( default `false`): If true, read a file as a single row and not 
split by "\n". So, read the textual content in wholetext mode and  write the 
content to a new file directly, there is no need to add "\n".


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