lidavidm commented on pull request #12579:
URL: https://github.com/apache/arrow/pull/12579#issuecomment-1061765269


   Isn't `T& operator[](int64_t)` exactly the operator to overload to enable 
assignment? e.g. [cppreference 
states](https://en.cppreference.com/w/cpp/language/operators#Array_subscript_operator)
 "User-defined classes that provide array-like access that allows both reading 
and writing typically define two overloads for operator[]: const and non-const 
variants"
   
   So then it would make sense IMO to allow updating the null bitmap in 
addition to the values


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