novemberkilo edited a comment on issue #156:
URL: 
https://github.com/apache/arrow-datafusion/issues/156#issuecomment-976340990


   I've had a look around and see the `length` kernel being used in the 
implementation of `OctetLength` which appears to be tested specifically on the 
string `josé` here: 
https://github.com/apache/arrow-datafusion/blob/master/datafusion/src/physical_plan/functions.rs#L2554-L2561
   
   I could use some help with understanding this issue please -- what is the 
desired outcome -- should the test referenced above change to say `Ok(Some(4))` 
perhaps?
   
   Thanks. 


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