jorgecarleitao commented on issue #305:
URL: 
https://github.com/apache/arrow-datafusion/issues/305#issuecomment-836439179


   Some alternatives:
   
   * create a node for these type of operations.
   
   * have the physical planner pass a `NullArray` to functions of zero 
arguments; `NullArray` has a length (only has a length).


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