wesm commented on pull request #7449:
URL: https://github.com/apache/arrow/pull/7449#issuecomment-647519089

   > The downside is that users of the Arrow library are exposed to the 
implementation details of how each kernel can grow the resulting array.
   I'm not saying that. I'm proposing instead a layered implementation 
approach. You will still write "utf8_lower(x)" in Python but the execution 
layer will decide when it's appropriate to split inputs or do type promotion. 
So Vaex shouldn't have to deal with these details. 

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