Github user HyukjinKwon commented on the issue:

    https://github.com/apache/spark/pull/21598
  
    I don't think it's too discretionary. We have a safeguard to control the 
behaviour. Spark mentions it in the migration guide. In case of changing public 
interface which breaks binary or source compatibility, there should really be 
strong argument, sure. For clarification, I don't think such change is made 
usually.
    
    In this case, it changes a behaviour even with a safeguard. Sounds pretty 
minor. I wonder why this is suddenly poped up. As I said, if the standards 
don't reflect the practice, the standards should be corrected or the practice 
should be complied. Committer's judgement is needed time to time. We need more 
committers for the more proper review iteration. Let's back it roll.
    
    If you prefer more conservative distribution, it should be an option to 
consider using a maintenance release.
    
    > we may choose to retain that buggy behavior
    
    I strongly disagree. We should fix the buggy behavior. There's no point of 
having upper versions.
    
    If you strongly doubt it, please open a discussion in the mailing list and 
see if we get agreed at some point.


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