rdettai commented on issue #790:
URL: 
https://github.com/apache/arrow-datafusion/issues/790#issuecomment-888956349


   Nice write-up and very interesting discussions! 
   - By feeding the signature as a key to the `HashMap`, are we not hashing the 
original key twice? I guess this can easily be solved by setting the identity 
function instead of the default hasher on the `HashMap`  😃
   - Too bad we cannot index into the 
[builder](https://github.com/apache/arrow-rs/blob/master/arrow/src/array/builder.rs),
 that would allow us to build the target arrow columns strait away. Can't wait 
for the switch to arrow2 😉 
   


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