romainfrancois commented on pull request #9615:
URL: https://github.com/apache/arrow/pull/9615#issuecomment-840387315


   Some drastic improvements for `floats` and `ints` is what I was after with 
the last few commits. That's a win. 
   
   Looking into strings now, hoping to be able to leverage parallelism there 
too, it's currently not the case: 
   
   ```cpp
     void DelayedExtend(SEXP values, int64_t size, RTasks& tasks) override {
       auto task = [this, values, size]() { return this->Extend(values, size); 
};
       // TODO: refine this., e.g. extract setup from Extend()
       tasks.Append(false, std::move(task));
     }
   ```


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