jhorstmann commented on pull request #7226:
URL: https://github.com/apache/arrow/pull/7226#issuecomment-631474781


   While writing the docs, I was wondering what is actually the usecase for the 
existing `new` function taking key and value builders as argument vs. taking 
two capacity values. It reduces the possibility for mixing up those two 
capacities, but I can't think of a reason for creating a dictionary builder 
with something else than two freshly instantiated builders.


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