ritchie46 opened a new issue #347:
URL: https://github.com/apache/arrow-rs/issues/347


   The `concat` kernel concats multiple arrays to contiguous memory. It has the 
potential to only allocate the required memory. However for (large)-utf8 and 
for (large)-list it does not do so and relies on exponential allocation to get 
the required memory.
   
   Precomputing the needed capacity of buffers would be faster and less memory 
heavy.


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