Dandandan commented on issue #790:
URL: 
https://github.com/apache/arrow-datafusion/issues/790#issuecomment-893215771


   So far I've been trying to get an example working with using `from_hash`. 
The complication is that `from_hash` only can have a look at the hash value, 
and not have an offset (to compare the collissions).
   
   I think that using the rawtable API 
https://docs.rs/hashbrown/0.11.2/hashbrown/raw/struct.RawTable.html might help 
here as we can store elements of type `(u64, usize)` as a key and avoiding the 
raw entry interface. The "identity" ha her in this case can just return the 
first value of the tuple.


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