Github user HyukjinKwon commented on the issue:

    https://github.com/apache/spark/pull/17590
  
    I think it is because it only checks multiple dots and the case I described 
above was finally found now (in my previous PR related with `from_json` 
function).
    
    I think multiple dots are still valid per ...
    
    > The preferred form for variable names is all lower case letters and words 
separated with dots
    
    Yea, maybe. I am fine with leaving this open for some days more to see if 
there is any objection. Probably, let me cc who I saw made many contributions. 
cc @shivaram, @yanboliang, @wangmiao1981 and @actuaryzhang here. Please let me 
know if there is any concern.


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