crepererum opened a new issue, #3078:
URL: https://github.com/apache/arrow-rs/issues/3078

   **Is your feature request related to a problem or challenge? Please describe 
what you are trying to do.**
   I'm trying to use the arrow format for an DataFusion group operator. For 
that it would be super helpful do detach/own a row (acting as a group key).
   
   **Describe the solution you'd like**
   Introduce a new type `OwnedRow` that does not borrow buffer (for that 
particular row, not the entire buffer) and type but owns it.
   
   **Describe alternatives you've considered**
   Make `Row` a copy-on-write type (similar to `Cow`). However this would 
introduce an enum-dispatch overhead to every row access and I think it's easier 
to do this on a type level (since I guess all users know if they own the row or 
not).
   
   **Additional context**
   \-
   


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