Github user rxin commented on the pull request:

    https://github.com/apache/spark/pull/8780#issuecomment-142095013
  
    Oh actually - let me correct it.
    
    If scale is positive, then precision needs to >= scale.
    
    If scale is negative, then precision can be anything (>0).
    
    I'm not sure if precision == 0 makes any sense, since that effectively 
means null value.
    



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