Github user HyukjinKwon commented on the issue:

    https://github.com/apache/spark/pull/13599
  
    @holdenk and @zjffdu, I believe manual tests are a-okay if it's difficult 
to write a test. We can manually test and expose this as an experimental 
feature too.
    
    BTW, I believe we can still have some tests to check if, for example, at 
least the string is properly constructed - 
https://github.com/apache/spark/pull/13599/files#r175670974? I think that could 
be enough for now. Somehow I happened to look into this multiple times over few 
years and I think it's better to go ahead than just blocking here.


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