Github user cloud-fan commented on the issue:

    https://github.com/apache/spark/pull/18144
  
    @jaceklaskowski  This brought a lot of pain in the past(see 
`functions.atan2`) and is ambiguous when a function parameter accepts both 
column and string literal. If we can go back we should never add functions with 
string parameter as column name. Maybe we should deprecate them for 
consistency...


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